Cited by 358Advanced Cellulose Research StudiesPolysaccharides and Plant Cell WallsNatural Fiber Reinforced Composites

The DOI matches its Crossref record; 51 of the 52 references it cites were found in a registry or an index; none of the 61 sources its claims cite is checked for support yet.

Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment

Open access

Tibolla, Heloisa, Pelissari, Franciele Maria, Menegalli, Florencia Cecilia·2014·LWT - Food Science and Technology

DOI 10.1016/j.lwt.2014.04.011

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Abstract

Cellulose nanofibers were isolated from banana peel bran using chemical treatment (CT—alkaline treatment, bleaching, and acid hydrolysis) and enzymatic treatment (ET—alkaline treatment and hydrolysis with xylanase). Both bran and cellulose nanofibers were characterized by size distribution, X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR); the morphological features of the bran and the nanostructures were studied by scanning (SEM) and transmission electron microscopy (TEM), respectively. TEM analysis evidenced that both treatments effectively isolated banana fibers in the nanometer scale. Nanofibers originating from CT and ET had an average diameter of 10.9 and 7.6 nm and a length of 454.9 and 2889.7 nm, respectively. The aspect ratio of all the samples lay in the range of long fibers. In neutral water, the nanofiber suspensions exhibited high and negative zeta potential, which prevented the nanofibers from aggregating and yielded a more stable colloidal suspension. XRD studies revealed that CT afforded more crystalline cellulose nanofibers (58.6%) as compared with ET (49.2%). FTIR confirmed that the treatments removed most of the hemicelluloses and lignin present in the banana fibers. Nanoparticles isolated from the banana peel by both treatments have potential application as reinforcing elements in composites.

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TL;DR

Cellulose nanofibers were isolated from banana peel bran using chemical treatment (alkaline treatment, bleaching, acid hydrolysis) and enzymatic treatment (alkaline treatment, xylanase hydrolysis). Both treatments produced nanoscale fibers, but enzymatic treatment gave longer, higher-aspect-ratio, more stable suspensions, while chemical treatment gave more crystalline nanofibers.

Key findings

Both treatments effectively isolated banana fibers in the nanometer scale: CT nanofibers had average diameter 10.9 ± 2.3 nm, length 454.9 ± 6.6 nm, aspect ratio 42.7 ± 7.5, and zeta potential −16.1 ± 0.7 mV; ET nanofibers had diameter 7.6 ± 1.5 nm, length 2889.7 ± 214.3 nm, aspect ratio 353.9 ± 28.2, and zeta potential −25.7 ± 0.6 mV.
XRD crystallinity index was 15.0% for bran, 58.6% for CT-treated CNFs, and 49.2% for ET-treated CNFs; bran crystallinity improved by 300% after CT and 200% after ET.
ET furnished twice as high yield (10%) as CT (5.1%); nanofiber suspension concentrations were 0.54 and 0.57 g/100 g for CT and ET, respectively.
FTIR confirmed that treatments removed most hemicelluloses and lignin, but ET did not remove lignin completely, leaving residual lignin and bundles/impurities; CT was more aggressive and removed amorphous components more effectively.

Methods

Bran was prepared from the peel of unripe plantain bananas of the variety “Terra” (*Musa paradisiaca*) from southeastern Brazil, harvested in March 2013; peels were dried, milled, washed with ethanol, and sieved through a 200-mesh sieve.
CT used 5% w/v KOH, 1% w/v NaClO₂ bleaching at pH 5.0 and 70 °C, a second KOH treatment, and 1% v/v H₂SO₄ hydrolysis at 80 °C for 1 h; ET used 5% w/v KOH delignification followed by xylanase (50 U/g bran) in acetate buffer pH 5.0 at 45 °C for 24 h, then enzyme denaturation at 80 °C for 30 min.
Characterization included SEM, TEM, laser diffraction particle size, zeta potential, XRD crystallinity index, and FTIR; ANOVA and Tukey tests were run at 5% significance.

Limitations

The paper states that a future study will investigate the potential reinforcement that nanofibers from both treatments promote in composites; no composite mechanical testing was performed here.
The paper states that the samples were compared without the mechanical treatment step, even though a previous study found seven passages through a high-pressure homogenizer most suitable, because the objective was to isolate the effect of chemical versus enzymatic treatment.
The paper states that ET did not remove lignin completely and that ET nanofibers contained residual bundles/impurities; CT was more aggressive, produced shorter nanofibers, and had lower zeta potential, making those CNFs more likely to aggregate.

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Registry

Crossref · 10.1016/j.lwt.2014.04.011

Cites

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Statistics

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Claims the paper makes

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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Nanofibers originating from CT and ET had an average diameter of 10.9 and 7.6 nm and a length of 454.9 and 2889.7 nm, respectively.”
- Also stated in: § 3.3. Scanning (SEM) and transmission electron microscopy (TEM) · plain
  “the CNFs obtained by CT and ET had diameters of 10.9 and 7.6 nm, respectively”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > Abstract
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
- Rests on an assumption: The TEM images processed for diameter measurement are representative of the nanofiber population.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TEM analysis evidenced that both treatments effectively isolated banana fibers in the nanometer scale.”
- Also stated in: § 3.3. Scanning (SEM) and transmission electron microscopy (TEM) · plain
  “In general, the CNFs obtained by CT and ET had diameters of 10.9 and 7.6 nm, respectively, showing that both treatments effectively isolated banana fibers in the nanometer scale (Table 1).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > Abstract
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Nanofibers originating from CT and ET had an average diameter of 10.9 and 7.6 nm and a length of 454.9 and 2889.7 nm, respectively.”
- Also stated in: § 3.3. Scanning (SEM) and transmission electron microscopy (TEM) · plain
  “the CNFs obtained by CT and ET had diameters of 10.9 and 7.6 nm, respectively”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > Abstract
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
- Rests on an assumption: The TEM images processed for diameter measurement are representative of the nanofiber population.

Show all 56 claims

It may state two separate claims as one. 46
Probably not a substantial claim. 23
The quote only partly states this claim. 2

In the paper
“The peak at 3337 cm À1 corresponded to eOH stretching; this band was related to specific intramolecular hydrogen bonds of cellulose II (Yang, Yan, Chen, Lee, & Zheng, 2007;Zuluaga et al., 2009).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.7. Fourier-transform infrared spectroscopy (FTIR)
What the sources say
- Not matched
  Couldn’t be matched to a paper in Crossref, so it can’t be checked.
  cites Yang, Yan, Chen, Lee, & Zheng, 2007;Zuluaga et al., 2009
Strength:plain· not yet calibratedCausal:correlational· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
It may state two separate claims as one.
In the paper
“The shoulder at 1731 cm À1 in the spectrum of the bran corresponded to vibrations of the acetyl and uronic ester groups of hemicelluloses or to the ester linkage of carboxylic group of the ferulic and p-coumaric acids of lignin (Cherian et al., 2008).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.7. Fourier-transform infrared spectroscopy (FTIR)
What the sources say
- Not checked yetcites Cherian et al., 2008 source
Strength:plain· not yet calibratedCausal:correlational· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
It may state two separate claims as one.
In the paper
“The bran contained a large amorphous portion; the typical Btype pattern peak at 2q ¼ 17 evidenced the presence of starch (Pirani & Hashaikeh, 2013).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.6. X-ray diffraction (XRD)
What the sources say
- Not checked yetcites Pirani & Hashaikeh, 2013
Strength:plain· not yet calibratedCausal:correlational· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
It may state two separate claims as one.
In the paper
“The sharp diffraction peaks at 2q ¼ 16 and 2q ¼ 22 were typical of cellulose I and indicated the higher crystallinity of the nanofibers as compared with the initial fibers (Rosa et al., 2010).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.6. X-ray diffraction (XRD)
What the sources say
- Not checked yetcites Rosa et al., 2010 source
Load-bearingStrength:hedged· not yet calibratedCausal:correlational· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The milder method used enzymes and furnished longer nanofibers with higher aspect ratio; nanofibers obtained by this method culminated in a more stable suspension, with higher zeta potential than the nanofibers obtained by chemical treatment.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 4. Conclusion
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
- Rests on an assumption: The performance of cellulose nanofibers as reinforcing agents is associated with surface charge (zeta potential).
In the paper
“Fig. 6 evidences that the bleaching (CT) and alkaline treatment (ET) steps removed most of the lignin from the CNFs: the bands at 1525 cm À1 (aromatic ring vibration) and 761 cm À1 (CeH strains) disappeared after these pretreatments (Zuluaga et al., 2009).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.7. Fourier-transform infrared spectroscopy (FTIR)
What the sources say
- Not checked yetcites Zuluaga et al., 2009 source
Load-bearingStrength:boosted· not yet calibratedCausal:direct· not yet calibrated
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It may state two separate claims as one.
In the paper
“The shoulder that appeared in the spectrum of the CT-treated CNFs at 1635 cm À1 was associated with adsorbed water; it could also reveal that conjugated carbonyl groups either existed in the polyphenolic structure of lignin or resulted from carbohydrate oxidation (Hassan et al., 2010).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.7. Fourier-transform infrared spectroscopy (FTIR)
What the sources say
- Not checked yetcites Hassan et al., 2010
Strength:hedged· not yet calibratedCausal:correlational· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
It may state two separate claims as one.
In the paper
“However, acid hydrolysis is corrosive, modifies the cellulose surface, and produces chemical waste (Satyamurthy et al., 2011).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Satyamurthy et al., 2011 source
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Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
In the paper
“Sulfuric acid is usually the reagent of choice: it efficiently cleaves the glycosidic bonds existing between the cellulose chains and prevents the CNFs from agglomerating, to generate stable colloidal suspensions (Pirani & Hashaikeh, 2013).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Pirani & Hashaikeh, 2013
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“Although various methods yield cellulose nanoparticles, their isolation usually involves three steps: (1) pretreatment of raw materials, (2) partial hydrolysis, and (3) mechanical disintegration (Sun, 2004).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Sun, 2004
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The efficiency of these processes depends on the treatment conditions, the nature of the raw material, and the properties of the hydrolytic agent (Sukumaran, Singhania, Mathew, & Pandey, 2009).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Sukumaran, Singhania, Mathew, & Pandey, 2009
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“Because it does not involve solvents or chemical reagents, enzymatic hydrolysis constitutes an environmentally friendly process that can potentially reduce operational costs and improve efficiency (Meyabadi & Dadashian, 2012;Siqueira, Bras, & Dufresne, 2010a;Yu, Lou, & Wu, 2008).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Meyabadi & Dadashian, 2012
- Not checked yetcites Siqueira, Bras, & Dufresne, 2010a
- Not checked yetcites Yu, Lou, & Wu, 2008
Load-bearingStrength:plain· not yet calibratedCausal:conditional· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Xylanases are hydrolytic enzymes that modify the random amorphous compounds (hemicelluloses) present in the plant fiber.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Hubbe, Rojas, Lucia, & Sain, 2008
- Not checked yetcites Pääkko et al., 2007 source
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“plant fibers, which are among the existing natural fibers, are an attractive materialdthey constitute rich sources of cellulose, the main component of plant cell walls (Lavoine, Desloges, Dufresne, & Bras, 2012).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Lavoine, Desloges, Dufresne, & Bras, 2012
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“The process conditions that lead to nanometric dimensions affect the morphological characteristics of the nanoparticles, thereby influencing how they perform as reinforcement material in composites (Rosa et al., 2010).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Rosa et al., 2010 source
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
Probably not a substantial claim.
None of the sources cited for this claim have been checked yet.
In the paper
“Acid hydrolysis (Lu & Hsieh, 2012;Tonoli et al., 2012;Zuluaga et al., 2009) and enzymatic hydrolysis (George, Ramana, Bawa, & Siddaramaiah, 2011;Hassan, Mathew, Hassan, & Oksman, 2010;Pääkko et al., 2007;Satyamurthy, Jain, Balasubramanya, & Vigneshwaran, 2011;Woehl et al., 2010) are the most commonly employed methods.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Lu & Hsieh, 2012
- Not checked yetcites Tonoli et al., 2012 source
- Not checked yetcites Zuluaga et al., 2009 source
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“Cellulose nanofibers (CNFs) offer many advantages: they are mechanically strong, stiff, and highly crystalline, so they find wide applications in the biomedical (Cherian et al., 2008), pharmaceutical (Villanova et al., 2011), and especially the paper industries (Sehaqui, Allais, Zhou, & Berglund, 2011); they can also function as reinforcing agents in polymer matrixes (Lee, Teramoto, & Endo, 2011;S”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Cherian et al., 2008 source
- Not checked yetcites Villanova et al., 2011 source
- Not checked yetcites Sehaqui, Allais, Zhou, & Berglund, 2011
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“The enzymatic hydrolysis of CNFs has to be fast, to avoid complete cellulose degradation (Zhu, Sabo, & Luo, 2011).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Zhu, Sabo, & Luo, 2011
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“they can also function as reinforcing agents in polymer matrixes (Lee, Teramoto, & Endo, 2011;Soykeabkaew, Laosat, Ngaokla, Yodsuwan, & Tunkasiri, 2012).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Lee, Teramoto, & Endo, 2011
- Not checked yetcites Soykeabkaew, Laosat, Ngaokla, Yodsuwan, & Tunkasiri, 2012
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
Probably not a substantial claim.
None of the sources cited for this claim have been checked yet.
In the paper
“They can also initiate the random hydrolysis of the b-1,4 non-reducing terminal regions located between the glycosidic linkages of the glucose units (Hubbe, Rojas, Lucia, & Sain, 2008;Pääkko et al., 2007).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 1. Introduction
What the sources say
- Not checked yetcites Hubbe, Rojas, Lucia, & Sain, 2008
- Not checked yetcites Pääkko et al., 2007 source
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“It is more appropriate to use the unripe banana peel instead of the ripe fruit.This is because the enzymatic synthesis of the fruit itself occurs during maturation, and thus, to partially degrade cellulose to monosaccharides (Happi Emaga, Robert, Ronkart, Wathelet, & Paquot, 2008).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 2.1. Materials
What the sources say
- Not checked yetcites Happi Emaga, Robert, Ronkart, Wathelet, & Paquot, 2008 source
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
In the paper
“According to Tholstrup Sejersen et al. (2007), nanosized particles should have high zeta potential, so that the colloidal suspension can resist aggregation, to increase its degree of dispersion in the composite.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.5. Zeta potential
What the sources say
- Not checked yetcites Tholstrup Sejersen et al. (2007) source
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
Probably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Higher electrostatic repulsion existed between the fibers in this case, providing enough surface charges to stabilize the suspension.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.5. Zeta potential
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
- Rests on an assumption: The performance of cellulose nanofibers as reinforcing agents is associated with surface charge (zeta potential).
In the paper
“A previous work by our research group (Pelissari et al., 2014) evaluated how the number of passages (0, 3, 5, and 7 times) affected the structure of the nanofibers.According to these previous results, the most suitable mechanical treatment condition to prepare CNFs was to accomplish seven passages through the high-pressure homogenizer.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 2.3. CNFs isolation 2.3.1. Chemical treatment (CT)
What the sources say
- Not checked yetcites Pelissari et al., 2014 source
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Bondeson and Oksman (2007) reported that hydrolysis with sulfuric acid elicited electrostatic repulsion between nanofibers in suspension, and that this process introduced natural sulfate groups into the nanofiber surface.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.5. Zeta potential
What the sources say
- Not checked yetcites Bondeson and Oksman (2007)
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
Probably not a substantial claim. It may state two separate claims as one.
In the paper
“During bleaching, chlorine and chlorites rapidly oxidized lignin, generating hydroxyl, carbonyl, and carboxylic groups; these groups facilitated lignin solubilization in alkaline medium and hence cellulose purification (Dufresne, Cavail ̀lé, & Vignon, 1997).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.2. Appearance and concentration of nanofiber suspensions
What the sources say
- Not checked yetcites Dufresne, Cavail ̀lé, & Vignon, 1997
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
It may state two separate claims as one.
In the paper
“Hassan, Hassan, and Oksman (2011) described that CT gave rise to less resistant CNFs, probably as a result of the shorter length of the nanoparticles.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.4. Particle size distribution
What the sources say
- Not checked yetcites Hassan, Hassan, and Oksman (2011)
Strength:hedged· not yet calibratedCausal:conditional· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“George et al. (2011) stated that high aspect ratio should favor tension transfer in the nanofiberematrix interface.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.4. Particle size distribution
What the sources say
- Not checked yetcites George et al. (2011) source
Load-bearingStrength:plain· not yet calibratedCausal:conditional· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
Probably not a substantial claim.
In the paper
“Indeed, Sun, Xu, Sun, Xiao, and Sun (2005) reported that CT effectively delignified cellulose and solubilized hemicelluloses in the barley straw.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.2. Appearance and concentration of nanofiber suspensions
What the sources say
- Not checked yetcites Sun, Xu, Sun, Xiao, and Sun (2005)
Strength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“CNFs isolation involved either acid or enzymatic hydrolysis, and these steps removed amorphous cellulosic domains (Siqueira et al., 2010a).”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.6. X-ray diffraction (XRD)
What the sources say
- Not checked yetcites Siqueira et al., 2010a
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
In the paper
“On the basis of the study by Pelissari et al. (2014), incomplete hemicelluloses and lignin removal during treatment and interfibrillar hydrogen bonds formation accounted for the residual nanofiber bundles.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.3. Scanning (SEM) and transmission electron microscopy (TEM)
What the sources say
- Not checked yetcites Pelissari et al. (2014) source
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.
In the paper
“Nanofibers of mulberry branch barks obtained by CT had I cr of 58.8% (Li et al., 2009), similar to that found for the CT-treated nanofibers herein.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.6. X-ray diffraction (XRD)
What the sources say
- Not checked yetcites Li et al., 2009
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“These diameters were similar to those of nanosized structures derived from other chemically treated sourcesdrice straw (12e35 nm) (Abe & Yano, 2009), sugarcane bagasse (30 nm) (Bhattacharya, Germinario, & Winter, 2008), and sugar beet (30e100 nm) (Leitner, Hinterstoisser, Wastyn, Keckes, & Gindl, 2007)dand enzymatically treated sourcesdbleached kraft bagasse pulp (9e 25 nm) (Hassan et al., 2010),”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.3. Scanning (SEM) and transmission electron microscopy (TEM)
What the sources say
- Not checked yetcites Abe & Yano, 2009
- Not checked yetcites Bhattacharya, Germinario, & Winter, 2008
- Not checked yetcites Leitner, Hinterstoisser, Wastyn, Keckes, & Gindl, 2007 source
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passes
The quote only partly states this claim.
In the paper
“In contrast, bagasse pulp nanofibers obtained by ET gave much higher I cr (73.9%) (Hassan et al., 2010) as compared with the ET-treated CNFs achieved in this study.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.6. X-ray diffraction (XRD)
What the sources say
- Not checked yetcites Hassan et al., 2010
Strength:plain· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passes
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Mussatto, Fernandes, Milagres, and Roberto (2008) stated that removal of hemicelluloses and lignin fractions extensively altered the structure of natural fibers, increasing the crystal surface area and the accessibility of the hydrolytic agent to the cellulose.”
§ Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment > 3.6. X-ray diffraction (XRD)
What the sources say
- Not checked yetcites Mussatto, Fernandes, Milagres, and Roberto (2008)
Load-bearingStrength:plain· not yet calibratedCausal:direct· not yet calibrated
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
It may state two separate claims as one.

66 of 66

The paper relies on this without support.
Enzymatic treatment allows for milder hydrolysis conditions compared with acid hydrolysis.
“Enzymatic treatment has gained prominence and is developing rapidly: it allows for milder hydrolysis conditions as compared with acid hydrolysis.”
The paper relies on this without support.
The omission of mechanical treatment does not prevent a valid comparison of the chemical and enzymatic treatments.
“However, because the main objective of this study was to determine how the chemical and enzymatic treatments affected the CNFs isolation, we decided to compare the samples without the mechanical treatment step.”
The paper relies on this without support.
The TEM images processed for diameter measurement are representative of the nanofiber population.
“To determine the diameters of the fibers, the TEM images were processed using processing analysis software (ImageJ).”
The paper relies on this without support.
The performance of cellulose nanofibers as reinforcing agents is associated with surface charge (zeta potential).
“The performance of the nanofiber as reinforcing agent is also associated with other features such as surface charge (zeta potential).”

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Authors: Tibolla, H., Pelissari, F. M., & Menegalli, F. C.
Affiliations: Universidade Estadual de Campinas (UNICAMP) (BR)
Corresponding author: Pelissari, Franciele Maria
ORCID: Tibolla, Heloisa
Pelissari, Franciele Maria
Venue: LWT - Food Science and Technology
Publisher: Elsevier BV
Published: 2014-12
Volume: 59
Issue: 2
Pages: 1311-1318
ISSN: 0023-6438 (ISSN-L)
DOI: 10.1016/j.lwt.2014.04.011
OpenAlex: W1997398631
Semantic Scholar: 0c59345e28ecf4bf94dd89971106b8f42a2ebcfa
Cited by: 358
References: 52
Citations by year: 2026: 19 · 2025: 27 · 2024: 36 · 2023: 34 · 2022: 44 · 2021: 39 · 2020: 42 · 2019: 38 · 2018: 28 · 2017: 24 · 2016: 17 · 2015: 10
FWCI: 6.43
Type: journal article
Language: en
Open access: hybrid
doi.org
Licence: cc-by-nc-nd
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
www.elsevier.com/legal/tdmrep-license (tdm)
creativecommons.org/licenses/by-nc-nd/4.0/ (vor, 2614 d)
Locations: LWT (publishedVersion, cc-by-nc-nd)
Funders: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (2952/2011)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (477842/2011-9)
Topics: Physical Sciences › Materials Science › Biomaterials › Advanced Cellulose Research Studies
Life Sciences › Agricultural and Biological Sciences › Plant Science › Polysaccharides and Plant Cell Walls
Physical Sciences › Materials Science › Polymers and Plastics › Natural Fiber Reinforced Composites
Keywords: cellulose nanofibers, banana peel, alkali treatment, xylanase hydrolysis, acid hydrolysis, bleaching, hemicellulose removal, lignin removal, crystallinity, zeta potential, colloidal stability, nanofiber morphology, composite reinforcement

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Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment

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