Optimization of microwave vacuum drying parameters for germinated lentils based on starch digestibility, antioxidant activity and total phenolic content
Open accessAbstract
The aim of this study was to optimize the processing parameters of pulse mode microwave-vacuum drying of germinated green and red lentils (CDC Greenland and CDC Maxim) and investigate the changes in their total phenolic content (TPC), total antioxidant activity (TAA) and In-vitro starch digestibility (SD). The lentils were germinated for 5 days and dried by a pulse mode microwavevacuum method, using 2 s to 8 s out of 10 s pulsed mode at 2000W microwave power and varying the vacuum pressure level between 15 and 45 kPa. In-vitro starch digestibility increased significantly with increased microwave power level. The TPC and TAA appeared to vary distinctively in the two varieties of selected lentils. Vacuum pressure levels did not significantly (p>0.05) affect any responses. Green lentils could be dried at 8 s microwave power and 45 kPa vacuum pressure and red lentils could be dried at 5.5 s microwave power and 42.19 kPa vacuum pressure. The microwave-vacuum drying showed great potential for the drying of germinated lentils.
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Microwave volumetric heating is used for fast product drying and vacuum controls heating rate without sacrificing product quality attributes.
“Microwave volumetric heating is used for fast product drying and vacuum controls heating rate without sacrificing product quality attributes (Nongmaithem et al., 2017).”
From Valorization of Pomegranate and Banana By-products into Value-added Products: Influence on Physicochemical, Rheological, and Consumer Attributes (2025) · cites this paper as Nongmaithem et al., 2017
The Introduction (section 1) says microwave-vacuum drying can shorten drying time at low temperatures while better retaining colour, texture, and nutrients. The Response surface analysis (section 3.3) describes volumetric heating and says vacuum lowers evaporation temperature, resulting in faster drying. It does not establish that vacuum controls the heating rate specifically; the Conclusions (section 4) describe minimum changes in phenolics and antioxidant activity, rather than no loss of quality attributes. (LLM, conf=0.84)
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- Authors
- Nongmaithem, R., & Meda, V.
- Affiliations
- University of Saskatchewan (CA)
- ORCID
- Meda, Venkatesh
- Venue
- International Journal of Food Studies
- Publisher
- ISEKI Food Association
- Published
- 2017-04-18
- Volume
- 6
- Issue
- 1
- Pages
- 44-55
- ISSN
- 2182-1054 (ISSN-L)
- OpenAlex
- W2608741479
- Cited by
- 8
- References
- 37
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 1 · 2018: 1
- FWCI
- 0.62
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- International Journal of Food Studies (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Centers for Disease Control and Prevention
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Food Drying and Modeling
- Physical Sciences › Engineering › Mechanical Engineering › Agricultural Engineering and Mechanization
- Life Sciences › Agricultural and Biological Sciences › Food Science › Microencapsulation and Drying Processes
- Keywords
- microwave vacuum drying, microwave power, vacuum pressure, in vitro starch digestibility, total phenolic content, antioxidant activity, green lentil, red lentil, drying parameter optimization
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