Quinoa seeds leach phytoecdysteroids and other compounds with anti-diabetic properties
Open accessAbstract
Quinoa (Chenopodium quinoa Willd.) contains high levels of biologically active phytoecdysteroids, which have been implicated in plant defense from insects, and have shown a range of beneficial pharmacological effects in mammals. We demonstrated that the most prevalent phytoecdysteroid, 20-hydroxyecdysone (20HE), was secreted (leached) from intact quinoa seeds into water during the initial stages of seed germination. Leaching efficiency was optimized by ethanol concentration (70% ethanol), temperature (80°C), time (4h), and solvent ratio (5 ml/g seed). When compared to extraction of macerated seeds, the leaching procedure released essentially all the 20HE available in the seeds (491 μg/g seed). The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice. Leaching effectively releases and concentrates bioactive phytochemicals from quinoa seeds, providing an efficient means to produce a food-grade mixture that may be useful for anti-diabetic applications.
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Written from the paper’s full text.
TL;DR
A one-step leaching process using 70% ethanol at 80°C for 4 h released essentially all 20-hydroxyecdysone (20HE) from intact quinoa seeds and produced a food-grade quinoa leachate (QL) enriched in phytoecdysteroids and flavonoids. In diet-induced obese, hyperglycemic mice, acute oral QL lowered fasting blood glucose dose-dependently, with 500 mg/kg reducing it by 36.2%.
Key findings
- 20HE leached from intact quinoa seeds into water during germination; over 144 h, leaching was greater at 37°C (294.0 μg/g seed) than at 25°C (156.5 μg/g seed), and at 37°C approximately 60% of total seed 20HE was leached.
- Optimized leaching conditions were 70% ethanol, 80°C, 4 h, and 5 ml solvent/g seed; this released essentially all available 20HE (491 μg/g seed), with a leachate yield of 4.5% and dried leachate containing 1.09% 20HE.
- QL prepared from 1 kg seed yielded 41.0 g and contained 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, 20.4% protein, 53.6% carbohydrates, 6.97% ash, and 3.53% moisture.
- In obese, hyperglycemic C57Bl/6J mice, acute QL decreased fasting blood glucose by 36.2% at 500 mg/kg and 18.5% at 250 mg/kg; metformin (300 mg/kg) decreased it by 26.4%, and 500 mg/kg QL and metformin significantly lowered final % FBG versus control.
Methods
- Bolivian-grown red quinoa seeds were used for aqueous leaching experiments at 25 or 37°C, in light and dark, over 24–144 h, and for ethanol leaching optimization across 0–95% ethanol, 25–80°C, 1–24 h, and varying solvent-to-seed ratios; 20HE and other compounds were quantified by LC-UV-MS.
- Leaching of intact seeds was compared with extraction of pulverized seeds in 70% ethanol at 25 or 80°C, including repeated extraction at 80°C.
- The animal study used five-week-old male C57Bl/6J mice fed a very high-fat diet (60% fat-derived calories) for 15 wk; after a 4 h fast, mice with fasting blood glucose above 200 mg/dL were randomized to vehicle, QL (250 or 500 mg/kg), or metformin (300 mg/kg) (n=7), and FBG was reassessed 4 h post-treatment by 1-way ANOVA with Dunnett’s post hoc test.
Limitations
- Stated in the paper: genetic and environmental factors affecting phytoecdysteroid content in quinoa seeds are currently unknown, and 20HE levels can vary greatly depending on quinoa seed source.
- Stated in the paper: the biological study was an acute hypoglycemic study in a diet-induced obese mouse model, not a chronic or human study.
- Evident from the text: the QL is a complex mixture containing phytoecdysteroids, flavonoids, oil, protein, amino acids, and trace saponins, so the observed anti-diabetic effect cannot be attributed solely to 20HE; the animal experiment used a small sample size (n=7 per group) and only a single post-treatment FBG measurement.
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Claims the paper makes
0 of 21 cited sources checked · 0 supported · 0 flagged
- Findingown data
The optimized quinoa leachate (QL) significantly lowered fasting blood glucose in obese, hyperglycemic mice.
“The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice.”
- Also stated in: § 3.4 In vivo hypoglycemic effect · boosted
“Acute oral administration of QL demonstrated a dose dependent decrease in FBG in diet-induced obese, hyperglycemic mice (C57BL/6J) with FBG levels above 200 mg/dL.”
Quote in the paperSubstantial claim - Also stated in: § 3.4 In vivo hypoglycemic effect · boosted
- Findingown data
Light did not impact the amount of 20HE leached from seeds compared with seeds germinated in the dark.
“Light did not impact the amount of 20HE that was leached from the seeds compared with the seeds germinated in the dark.”
Quote in the paperNot a substantial claim - Findingown data
The fast, efficient method described here enhanced the 20HE content in QL 17.5-fold compared with the concentration found in the seeds.
“The fast, efficient method described here for leaching and concentrating 20HE from quinoa seeds enhanced the 20HE content in QL 17.5-fold, compared with the concentration found in the seeds.”
Quote in the paperSubstantial claim - Findingown data
The optimized quinoa leachate (QL) contained 2.59% flavonoid glycosides.
“The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice.”
- Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
“The total flavonoid glycoside content, determined as QT-I equivalents, was 2.59% of QL.”
Quote in the paperNot a substantial claim - Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
- Findingown data
At temperatures above 25°C, more seed material, including 20HE, was leached into solvent.
“At temperatures above 25°C, more seed material, including 20HE, was leached into the solvent (Table 1).”
Quote in the paperSubstantial claim
- Findingown data
Metformin (300 mg/kg) decreased FBG by 26.4%.
“Metformin (300 mg/kg) decreased FBG by 26.4%.”
Quote in the paperNot a substantial claim - Findingown data
QT-I was isolated and identified as quercetin 3-O-(2,6-di-α-L-rhamno-pyranosyl)-β-D-galactopyranoside.
“The compound was identified as quercetin 3-O-(2,6-di-α-L-rhamno-pyranosyl)-β-D-galactopyranoside according to its MS, MS/MS and NMR spectra, and in comparison with the spectra reported in the literature (Zhu, Sheng, Li, Lavoie, Karwe, Rosen, & Ho, 2001b).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Zhu et al., 2001b
Not checked in the free run.
- Findingown data
The optimized quinoa leachate (QL) contained 1.00% total phytoecdysteroids.
“The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice.”
- Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
“20HE constituted 0.86% of QL, whereas the total phytoecdysteroid content was 1.00%.”
Quote in the paperNot a substantial claim - Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
- Findingown data
The optimal ethanol concentration for leaching 20HE from quinoa seeds at 25°C was 70%.
“The optimal ethanol concentration for leaching 20HE from quinoa seeds at 25°C was 70% (Fig. 2A).”
Quote in the paperSubstantial claim - Findingown data
250 mg/kg QL decreased FBG by an average of 18.5% relative to initial FBG.
“Relative to the initial FBG levels of individual mice, 500 and 250 mg/kg QL decreased te FBG by an average of 36.2% and 18.5%, respectively.”
Quote in the paperSubstantial claim - Findingown data
Post-leached seeds still contained the majority of their macronutrient content following leaching (95.9% of initial seed weight).
“The seed by-products were sterilized by 4 h incubation in 70% ethanol, and still contained the majority of their macronutrient content following the leaching process (95.9% of initial seed weight).”
Quote in the paperSubstantial claim - Findingown data
The optimized quinoa leachate (QL) contained 11.9% oil.
“The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice.”
- Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
“Other components, determined by proximate nutritional analysis of QL, included carbohydrates (53.6%), protein (20.4%), oil (11.9%), ash (6.97%) and moisture (3.53%).”
Quote in the paperNot a substantial claim - Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
- Findingown data
At 37°C, approximately 60% of the total 20HE in intact quinoa seeds was leached into water.
“At 37°C, approximately 60% of the total 20HE in intact quinoa seeds was leached into water.”
Quote in the paperSubstantial claim - Findingown data
20-hydroxyecdysone (20HE) is leached or secreted from intact quinoa seeds into water during the initial stages of seed germination.
“We demonstrated that the most prevalent phytoecdysteroid, 20-hydroxyecdysone (20HE), was secreted (leached) from intact quinoa seeds into water during the initial stages of seed germination.”
- Also stated in: § 3.1. 20HE leaches from germinating seeds · plain
“20HE leached from quinoa seeds into water gradually over the course of 144 h, with greater leaching occurring at 37°C (294.0 μg/g seed) compared with at 25°C (156.5 μg/g seed) (Fig. 1).”
- Also stated in: § 4. Discussion · boosted
“This work demonstrated for the first time that 20HE is leached or secreted from germinating quinoa seeds.”
Quote in the paperSubstantial claim - Also stated in: § 3.1. 20HE leaches from germinating seeds · plain
- Findingown data
Acute oral administration of QL demonstrated a dose-dependent decrease in FBG in diet-induced obese, hyperglycemic mice with FBG levels above 200 mg/dL.
“Acute oral administration of QL demonstrated a dose dependent decrease in FBG in diet-induced obese, hyperglycemic mice (C57BL/6J) with FBG levels above 200 mg/dL.”
Quote in the paperSubstantial claim - Findingown data
500 mg/kg QL decreased FBG by an average of 36.2% relative to initial FBG.
“Relative to the initial FBG levels of individual mice, 500 and 250 mg/kg QL decreased te FBG by an average of 36.2% and 18.5%, respectively.”
Quote in the paperSubstantial claim - Findingown data
The leaching procedure released essentially all the 20HE available in the seeds (491 μg/g seed) compared to extraction of macerated seeds.
“When compared to extraction of macerated seeds, the leaching procedure released essentially all the 20HE available in the seeds (491 μg/g seed).”
- Also stated in: § 3.2. Optimal leaching conditions · plain
“Compared with the total 20HE that was obtained from repeated extraction of seeds, leaching intact seeds in 70% ethanol at 80°C for 4 h released the maximum amount of 20HE available in the seeds (491 μg/g) (Table 1).”
Quote in the paperSubstantial claim - Also stated in: § 3.2. Optimal leaching conditions · plain
- Findingown data
The optimized quinoa leachate (QL) contained 0.86% 20HE.
“The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice.”
- Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
“20HE constituted 0.86% of QL, whereas the total phytoecdysteroid content was 1.00%.”
Quote in the paperNot a substantial claim - Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
- Findingnone given
QL production leaves behind mostly intact quinoa seeds that still contain the majority of their macronutrient reserves (protein, starch and oil).
“QL production leaves behind mostly intact quinoa seeds that still contain majority of their macronutrient reserves (protein, starch and oil), which can be recycled as food ingredients.”
Quote in the paperSubstantial claim - Premisecitation
Quinoa contains high levels of biologically active phytoecdysteroids.
“Quinoa (Chenopodium quinoa Willd.) contains high levels of biologically active phytoecdysteroids, which have been implicated in plant defense from insects, and have shown a range of beneficial pharmacological effects in mammals.”
- Also stated in: § 1. Introduction · plain
“Among agricultural food crops that are regularly sold and consumed in the United States, quinoa is a rich source of phytoecdysteroids (Kumpun, Maria, Crouzet, Evrard-Todeschi, Girault, & Lafont, 2011; Zhu, et al., 2001a).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Kumpun et al., 2011 source
Not checked in the free run.
- cites Zhu et al., 2001a
Not checked in the free run.
- Also stated in: § 1. Introduction · plain
- Premisecitation
The highest concentration of 20HE previously reported in an extract of an edible crop was achieved through multi-step solvent extraction of spinach leaves.
“The highest concentration of 20HE previously reported in an extract of an edible crop was achieved through a multi-step solvent extraction of spinach leaves (Spinacia oleracea L.) (Gorelick-Feldman, et al., 2008).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Gorelick-Feldman et al., 2008 source
Not checked in the free run.
- Premisecitation
Administration of 20HE (10 mg/kg body weight for 13 weeks) to diet-induced obese, hyperglycemic mice significantly lowered blood glucose levels.
“Administration of 20HE (10 mg/kg body weight for 13 weeks) to diet-induced obese, hyperglycemic mice significantly lowered blood glucose levels, increased insulin sensitivity, decreased body weight and reduced adiposity 41% compared with the control without affecting food consumption (Kizelsztein, Govorko, Komarnytsky, Evans, Wang, Cefalu, & Raskin, 2009).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Kizelsztein et al., 2009 source
Not checked in the free run.
- Premisecitation
Quinoa seeds contain 4-12 times more 20HE by dry weight (184-484 μg/g) than spinach leaves (40 μg/g).
“Quinoa seeds, however, contain 4 – 12 times more 20HE by dry weight (184 – 484 μg/g) (Kumpun et. al., 2011) than spinach leaves (40 μg/g) (Gorelick-Feldman, et al., 2008), and are therefore more attractive for the development of 20HE-enriched botanicals.”
Quote in the paperSubstantial claim0 of 2 sources checked - Interpretationown data
Leaching effectively releases and concentrates bioactive phytochemicals from quinoa seeds.
“Leaching effectively releases and concentrates bioactive phytochemicals from quinoa seeds, providing an efficient means to produce a food-grade mixture that may be useful for anti-diabetic applications.”
Quote in the paperSubstantial claim - Interpretationreasoning
The acute hypoglycemic effects of QL, combined with previous reports on the anti-diabetic and anti-obesity effects of chronic 20HE administration, support QL's potential to treat or prevent hyperglycemia and insulin resistance associated with human metabolic syndrome.
“The acute hypoglycemic effects of QL, combined with previous reports on the anti-diabetic and anti-obesity effects of chronic 20HE administration, support QL’s potential to treat or prevent hyperglycemia and insulin resistance associated with human metabolic syndrome (Foucault, Mathe, Lafont, Even, Dioh, Veillet, Tome, Huneau, Hermier, & Quignard-Boulange, 2011; Kizelsztein, et al., 2009).”
Quote in the paperSubstantial claim0 of 2 sources checked - Interpretationreasoning
Quinoa seed leaching may be a way to harness the clinically therapeutic benefits of quinoa phytochemicals while preserving the nutritional benefits of non-leached quinoa components.
“Therefore, quinoa seed leaching may be a way to harness the clinically therapeutic benefits of quinoa phytochemicals while preserving the nutritional benefits of non-leached quinoa components.”
Quote in the paperSubstantial claim - Interpretationown data
The leaching process was optimized to concentrate the anti-diabetic quinoa constituents.
“The leaching process was optimized to concentrate the anti-diabetic quinoa constituents.”
Quote in the paperSubstantial claim - Premisecitation
20HE levels in quinoa seeds can vary greatly depending on the source.
“As noted by Kumpun et al. (2011), 20HE levels in quinoa seeds can vary greatly depending on the source.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Kumpun et al., 2011 source
Not checked in the free run.
- Interpretationown data
Our biochemical characterization corroborates previous reports that quinoa seeds contain relatively high levels of phytoecdysteroids.
“Our biochemical characterization corroborates previous reports that quinoa seeds contain relatively high levels of phytoecdysteroids.”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites Zhu et al., 2001a
Not checked in the free run.
- cites Kumpun et al., 2011 source
Not checked in the free run.
- May combine two claims. 14
- Classified as probably not a substantial claim. 14
May combine two claims.
Findingown dataThe total amount of 20HE leached, concentration in dry leachate and leachate yield all decreased dramatically in 95% ethanol.
“The total amount of 20HE leached, concentration in the dry leachate and leachate yield all decreased dramatically in 95% ethanol.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Findingnone givenPost-leached seeds retained their shape, form and colour.
“Post-leached seeds retained their shape, form and colour.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataQL prepared from 1 kg seed under optimal conditions yielded 41.0 g QL.
“QL was prepared for phytochemical, nutritional, and biological study from 1 kg seed under optimal conditions, yielding 41.0 g QL.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataSonication and solvent acidification did not affect the amount of 20HE leached from seeds or the 20HE concentration in dried leachate.
“Sonication and solvent acidification did not affect the amount of 20HE leached from the seeds or the 20HE concentration in the dried leachate (data not shown).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataQL contained 6.97% ash.
“Other components, determined by proximate nutritional analysis of QL, included carbohydrates (53.6%), protein (20.4%), oil (11.9%), ash (6.97%) and moisture (3.53%).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe optimal leaching conditions were 70% ethanol, 80°C, 4 h, and 5 ml solvent per g seed.
“Leaching efficiency was optimized by ethanol concentration (70% ethanol), temperature (80°C), time (4 h), and solvent ratio (5 ml/g seed).”
- Also stated in: § 3.2. Optimal leaching conditions · boosted
“Leaching was further optimized by time (1–8 h) and solvent to seed ratio (1–5 ml/g seed), demonstrating that 4 h of leaching and 5 ml solvent/g seed were the optimal conditions for leaching most of the 20HE available in seeds and obtaining the highest yield of QL (Supplementary Fig. 1).”
Quote in the paperSubstantial claim- Also stated in: § 3.2. Optimal leaching conditions · boosted
Probably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataQL contained 0.37% branched chain amino acids (leucine, isoleucine, and valine).
“About 0.37% of QL consisted of branched chain amino acids (leucine, isoleucine, and valine) (Supplementary Table 1).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown data20HE leached from quinoa seeds into water gradually over 144 h, with greater leaching at 37°C (294.0 μg/g seed) compared with 25°C (156.5 μg/g seed).
“20HE leached from quinoa seeds into water gradually over the course of 144 h, with greater leaching occurring at 37°C (294.0 μg/g seed) compared with at 25°C (156.5 μg/g seed) (Fig. 1).”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataQL contained 3.53% moisture.
“Other components, determined by proximate nutritional analysis of QL, included carbohydrates (53.6%), protein (20.4%), oil (11.9%), ash (6.97%) and moisture (3.53%).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataExtracting ground seeds in 70% ethanol at 25°C released 399 μg 20HE/g seed, whereas leaching intact seeds for 24 h released 317.8 μg 20HE/g seed (about 80% as efficient as extraction).
“Extracting the ground seeds in 70% ethanol at 25°C released 399 μg 20HE/g seed, whereas leaching intact seeds for 24 h released 317.8 μg 20HE/g seed (about 80% as efficient as extraction).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataLeachate yield using 70% ethanol was 29.7 mg/g seed compared to 38.1 mg/g for extract.
“For example, the leachate yield produced using 70% ethanol was 29.7 mg/g seed compared to 38.1 mg/g for the extract (Fig. 2C).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataThe optimized quinoa leachate (QL) contained 20.4% protein.
“The optimized quinoa leachate (QL), containing 0.86% 20HE, 1.00% total phytoecdysteroids, 2.59% flavonoid glycosides, 11.9% oil, and 20.4% protein, significantly lowered fasting blood glucose in obese, hyperglycemic mice.”
- Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
“Other components, determined by proximate nutritional analysis of QL, included carbohydrates (53.6%), protein (20.4%), oil (11.9%), ash (6.97%) and moisture (3.53%).”
Quote in the paperNot a substantial claim- Also stated in: § 3.3. Biochemical analysis of quinoa leachate (QL) · plain
May combine two claims.
Findingown dataUnder optimal conditions (70% ethanol, 80°C, 4 h), leachate yield was 4.5% and 20HE content of dried leachate was 1.09%.
“Under these conditions, the leachate yield was 4.5% and the 20HE content of the dried leachate was 1.09%.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataMetformin and 500 mg/kg QL significantly decreased final % FBG compared with control.
“Metformin and the higher dose of QL (500 mg/kg) significantly decreased final % FBG compared with the control by 1-way ANOVA followed by Dunnett’s post hoc test (Fig. 4).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataFifteen peaks corresponding with fifteen different molecules were putatively identified in QL, including 4 quercetin glycosides, 1 kaempferol glycoside and 5 phytoecdysteroids.
“Fifteen peaks corresponding with fifteen different molecules were putatively identified as listed in Table 2, including 4 quercetin glycosides, 1 kaempferol glycoside and 5 phytoecdysteroids (20HE, makisterone A, epi-makisterone A, 24(28)-dehydromakisterone A, and makisterone C).”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataLC-MS analysis of QL revealed trace amounts of saponins.
“LC-MS analysis of QL also revealed trace amounts of saponins (data not shown).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataLeaching was further optimized by time (1-8 h) and solvent to seed ratio (1-5 ml/g seed), with 4 h and 5 ml/g seed being optimal.
“Leaching was further optimized by time (1–8 h) and solvent to seed ratio (1–5 ml/g seed), demonstrating that 4 h of leaching and 5 ml solvent/g seed were the optimal conditions for leaching most of the 20HE available in seeds and obtaining the highest yield of QL (Supplementary Fig. 1).”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataQL contained 53.6% carbohydrates.
“Other components, determined by proximate nutritional analysis of QL, included carbohydrates (53.6%), protein (20.4%), oil (11.9%), ash (6.97%) and moisture (3.53%).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataQuinoa seeds leach the majority of their stored phytoecdysteroids, along with several other biologically active compounds, such as flavonoids, into the surrounding medium.
“We have demonstrated that quinoa seeds leach the majority of their stored phytoecdesteroids, along with several other biologically active compounds, such as flavonoids, into the surrounding medium, possibly as a defense mechanism against soil insects.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn our study, AlterEco red quinoa seeds contained 491.3 μg 20HE/g seed, constituting 85.7% of total phytoecdysteroids.
“In our study, AlterEco red quinoa seeds contained 491.3 μg 20HE/g seed, constituting 85.7% of total phytoecdysteroids.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationPhytoecdysteroids have been implicated in plant defense by deterring insect herbivory, delaying insect development and causing lethality to insect larvae.
“Phytoecdysteroids are polyhydroxylated steroids, structurally related to insect molting hormones, that have been implicated in plant defense by deterring insect herbivory, delaying insect development and causing lethality to insect larvae (Arnault & Slama, 1986; Blackford & Dinan, 1997; Marion-Poll & Descoins, 2002; Rharrabe, Sayan, & Lafont, 2010; Singh & Russell, 1980).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Arnault & Slama, 1986
Not checked in the free run.
- cites Blackford & Dinan, 1997
Not checked in the free run.
- cites Marion-Poll & Descoins, 2002
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationPhytoecdysteroids have shown a wide range of therapeutic effects in mammals, including anabolic, performance enhancing, anti-osteoporotic and wound healing properties.
“Phytoecdysteroids have also shown a wide range of therapeutic effects in mammals, including anabolic, performance enhancing (Gorelick-Feldman, MacLean, Ilic, Poulev, Lila, Cheng, & Raskin, 2008; Slama & Lafont, 1995), anti-osteoporotic (Kapur, Wuttke, Jarry, & Seidlova-Wuttke, 2010; Seidlova-Wuttke, Christel, Kapur, Nguyen, Jarry, & Wuttke, 2010) and wound healing properties (Syrov & Khushbaktova,”
Quote in the paperNot a substantial claim0 of 3 sources checkedClassified as probably not a substantial claim.
PremisecitationFoucault et al. (2011) previously reported a method for producing a conventional 20HE-enriched extract (1.5-2.0% 20HE w/w) from quinoa seeds.
“Foucault et al. (2011) has previously reported a method for producing a conventional 20HE-enriched extract (1.5 – 2.0% 20HE w/w) from quinoa seeds.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Foucault et al., 2011 source
Not checked in the free run.
Classified as probably not a substantial claim.
Premisecitation20-hydroxyecdysone (20HE) may play a role in the treatment and prevention of diabetes and obesity.
“Recent literature also suggests that the most prevalent phytoecdysteroid, 20-hydroxyecdysone (20HE, also known as ecdysterone or β-ecdysone) may play a role in the treatment and prevention of diabetes and obesity.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Kizelsztein et al., 2009 source
Not checked in the free run.
May combine two claims.
PremisecitationThe Foucault et al. method resulted in a relatively low yield (10 mg extract/g seeds) and necessitated pulverization of seeds upon boiling, followed by several extractions and drying steps.
“However, this method resulted in a relatively low yield (10 mg extract/g seeds) and necessitated pulverization of the seeds upon boiling, followed by several extractions and drying steps.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Foucault et al., 2011 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataMice were randomly divided into FBG-balanced experimental groups.
“Following a 4 h fasting period, the fasting blood glucose (FBG) was measured using an AlphaTRAK® handheld glucometer (Abbott Labs, Inc.), and mice were randomly divided into FBG-balanced experimental groups.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenThe animal study was carried out in accordance with guidelines approved by the Institutional Animal Care and Use Committee at Rutgers University (Protocol Number: 04-023).
“This study was carried out in accordance with the guidelines approved by the Institutional Animal Care and Use Committee at Rutgers University (Protocol Number: 04-023).”
Quote in the paperNot a substantial claim
The paper relies on this without support.
Little work has been done to investigate the role of quinoa's secondary metabolites in human health.
“However, little work has been done to investigate the role of quinoa’s secondary metabolites in human health.”
The paper relies on this without support.
The genetic and environmental factors affecting phytoecdysteroid content in quinoa seeds are currently unknown.
“However, the genetic and environmental factors affecting phytoecdysteroid content in quinoa seeds are currently unknown.”
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Each is checked against this paper’s own text: does it say what the citing paper says it does?
Quinoa extracts showed anti-obesity, antioxidant, hypoglycemic, immunoregulatory, and collagenase-modulating effects in in vivo experiments with rats.
“Quinoa extracts showed anti-obesity, antioxidant, hypoglycemic, immunoregulatory, and collagenase-modulating effects in in vivo experiments with rats [208,209,210,211,212,213,214].”
From Ecdysterone and Turkesterone—Compounds with Prominent Potential in Sport and Healthy Nutrition (2024) · cites this paper as [210]
The Results (section 3.4) report that quinoa leachate lowered fasting blood glucose in an in vivo experiment, supporting the hypoglycemic part of the claim. The animals were mice, not rats. The paper does not report in vivo anti-obesity, antioxidant, immunoregulatory, or collagenase-modulating effects of the quinoa extract; its Discussion describes some properties of constituent flavonoids rather than demonstrating those effects for the extract. (LLM, conf=0.88)
Experimental — accuracy not yet measuredOptimized quinoa extract significantly lowered fasting blood glucose in obese, hyperglycaemic mice.
“The optimized Q extract significantly lowered fasting blood glucose in obese, hyperglycaemic mice [73].”
From Molecular Targets of 20-Hydroxyecdysone in Mammals, Mechanism of Action: Is It a Calorie Restriction Mimetic and Anti-Aging Compound? (2025) · cites this paper as [73]
Quinoa extract counteracted the high-fat-related elevation of lipoprotein lipase and peroxisome proliferator-activating receptor-γ mRNA levels, indicating a decrease in fat-storing capacity in adipose tissues.
“It was also found that Q counteracted the HF-related elevation of lipoprotein lipase (LPL) and peroxisome proliferator-activating receptor-γ mRNA levels, indicating a decrease in fat-storing capacity in adipose tissues.”
From Molecular Targets of 20-Hydroxyecdysone in Mammals, Mechanism of Action: Is It a Calorie Restriction Mimetic and Anti-Aging Compound? (2025) · cites this paper as [73]
The Results (section 3.4; page unavailable) report that quinoa leachate lowered fasting blood glucose in obese mice, but do not report LPL or PPAR-γ mRNA measurements. Searches for those markers and fat-storing capacity found no passage in our copy addressing the claimed effect in adipose tissue. (LLM, conf=0.76)
Experimental — accuracy not yet measuredFaecal lipid ratio was increased without altering stool amount.
“The faecal lipid ratio was also increased without altering the stool amount.”
From Molecular Targets of 20-Hydroxyecdysone in Mammals, Mechanism of Action: Is It a Calorie Restriction Mimetic and Anti-Aging Compound? (2025) · cites this paper as [73]
The Animal study methods (section 2.8; page unavailable) describe monitoring food intake and body weight, while the in vivo results (section 3.4; page unavailable) report fasting blood glucose. Searches for faecal lipid ratio, stool amount, fecal fat excretion, and stool weight found no passage addressing either part of the claim. (LLM, conf=0.76)
Experimental — accuracy not yet measuredQuinoa grains are a prospective source of a wide range of phytoecdysteroids and polyphenols of adaptogenic action.
“A prospective source of a wide range of phytoecdysteroids and polyphenols of adaptogenic action is quinoa (Chenopodium quinoa Willd.) grains [3,4].”
From Anxiolytic and Antioxidant Effect of Phytoecdysteroids and Polyphenols from Chenopodium quinoa on an In Vivo Restraint Stress Model (2022) · cites this paper as [4]
Quinoa seeds contain many PEs, even more than spinach, with anti-diabetic properties; they decrease blood glucose in obesity.
“Additionally, quinoa seeds contain many PEs, even more than spinach, with anti-diabetic properties. They decrease blood glucose in obesity [188].”
From Phytoecdysteroids: Distribution, Structural Diversity, Biosynthesis, Activity, and Crosstalk with Phytohormones (2022) · cites this paper as [188]
Quinoa is the only staple crop reported to contain phytoecdysteroids.
“Compared with traditional Poaceae cereal grains, quinoa is the only staple crop reported to contain PE,8–10”
In previous studies, total FG content of 1-2 quinoa cultivars ranged from 543 to 2561 μg/g.
“FG content of 1 – 2 quinoa cultivars was measured via LC-UV-MS in 3 separate studies, showing total FG contents ranging from 543 – 2561 μg/g.10, 21, 30”
The leaching method (70% ethanol with heat) yields most 20HE available in quinoa seeds, achieving levels equal to or above traditional extraction of macerated seed material.
“Our method of leaching intact seeds in 70% ethanol with heat has previously been shown to yield most 20HE available in the seeds, achieving levels equal to or above those obtained from traditional extraction of macerated seed material.10”
PE and FG are under rigorous investigation for their anti-diabetic, weight reducing, cardioprotective, and anticarcinogenic properties.
“while PE and FG are under rigorous investigation for their anti-diabetic, weight reducing, cardioprotective, and anticarcinogenic properties.10, 11, 22, 24”
Quinoa is especially notable in phytoactive content due to the presence of PE, which are not found in any Poaceae cereal grains, and are only reported to be present in a few other edible crops such as spinach, though in lower concentrations.
“Quinoa is especially notable in phytoactive content due to the presence of PE, which are not found in any Poaceae cereal grains, and are only reported to be present in a few other edible crops such as spinach, though in lower concentrations.10, 15”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
20HE concentration is reported with the wrong units
MinorThe stated 10.4 and 10.7 values match the 20HE released divided by the dried-product yields, giving μg 20HE per mg of dried extract or leachate-not per g of seed. Expressed per g of seed, the paper reports 399 and 317.8 μg, respectively.
“Therefore, the dried extracts and leachates had a similar 20HE content (10.4 and 10.7 μg 20HE/g seed, respectively) (Fig. 2B).”
“Extracting the ground seeds in 70% ethanol at 25°C released 399 μg 20HE/g seed, whereas leaching intact seeds for 24 h released 317.8 μg 20HE/g seed (about 80% as efficient as extraction).”
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- Authors
- Graf, B. L., Poulev, A., Kuhn, P., Grace, M. H., Lila, M. A., & Raskin, I.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- North Carolina State University (US)
- Corresponding author
- Graf, Brittany L.
- Raskin, Ilya
- Venue
- Food Chemistry
- Publisher
- Elsevier BV
- Published
- 2014-11
- Volume
- 163
- Pages
- 178-185
- ISSN
- 0308-8146 (ISSN-L)
- PMC
- PMC4116738
- OpenAlex
- W2149960342
- Cited by
- 129
- References
- 40
- Citations by year
- 2026: 3 · 2025: 10 · 2024: 15 · 2023: 14 · 2022: 14 · 2021: 20 · 2020: 14 · 2019: 9 · 2018: 3 · 2017: 10 · 2016: 9 · 2015: 5 · 2014: 3
- FWCI
- 12.88
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Food Chemistry (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Center for Complementary and Integrative Health (P50AT002776)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Seed and Plant Biochemistry
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Natural Antidiabetic Agents Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Phytochemical Studies and Bioactivities
- Keywords
- quinoa seeds, quinoa, phytoecdysteroids, 20-hydroxyecdysone, seed germination, flavonoid glycosides, antidiabetic activity, fasting blood glucose, hyperglycemia, obesity, bioactive compounds
- MeSH terms
- Animals, Chromatography, Liquid, Ecdysterone, Hypoglycemic Agents, Male, Mice, Inbred C57BL, Seeds, Chenopodium quinoa, Mice
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