Functional group changes and chemical bond-dependent dielectric properties of lotus seed flour with microwave vacuum drying
- PMID:33216372
- DOI: 10.1111/1750-3841.15492
Functional group changes and chemical bond-dependent dielectric properties of lotus seed flour with microwave vacuum drying
Abstract
Microwave vacuum drying (MVD) was applied to dehydrate lotus (Nelumbo nucifera Gaertn.) seeds. This paper evaluated the changes of molecular, crystalline, and morphological structural properties of lotus seeds after MVD. The results showed the frequency of δ(CH) bending, β(CH), ν(OH), and carbon-oxygen double bonds (C = O) increased with increasing microwave power density. Moreover, as microwave power density increased, the transition enthalpy of crystallinity gradually increased, which was related to the formation of crystalline starch, re-crystallization, and complexes of starch-lipid structure depending on the hydrogen bonds formed. The MVD process resulted molecular polarity of lotus seeds, whereas the dielectric properties also changed. The dielectric properties interacted with the changes of molecules and crystalline structure. The morphology of lotus seed flour changed because the shape of starch granules was disrupted and the granules became aggregated with nonstarch components as the microwave power density increased. All these results explain the interactions among polymer molecules in lotus seeds dried by MVD.
Keywords: crystallinity; lotus seed flour; microwave vacuum drying; molecular structure.
© 2020 Institute of Food Technologists®.
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References
REFERENCES
- Ahmed, J., Ramaswamy, H. S., & Vgs, R. (2007). Dielectric properties of Indian Basmati rice flour slurry. Journal of Food Engineering, 80(4), 1125-1133.https://doi.org/10.1016/j.jfoodeng.2006.09.004
- Ambros, S., Först, P., & Kulozik, U. (2018). Temperature-controlled microwave-vacuum drying of lactic acid bacteria: Impact of drying conditions on process and product characteristics. Journal of Food Engineering, 224, MAY, 80-87.https://doi.org/10.1016/j.jfoodeng.2017.12.025.
- Anli, E. A. (2019). Possibilities for using microwave-vacuum drying in lor cheese production. International Dairy Journal, 102, 104618.https://doi.org/10.1016/j.idairyj.2019.104618
- Bernazzani, P., Peyyavula, V. K., Agarwal, S., & Tatikonda, R. K. (2008). Evaluation of thephase composition of amylose by FTIR and isothermal immersion heats. Polymer, 49(19), 4150-4158.https://doi.org/10.1016/j.polymer.2008.07.022
- Cael, S. J., Koenig, J. L., & Blackwell, J. (1973). Infrared and Raman spectroscopy of carbohydrates: Part III: Raman spectra of the polymorphic forms of amylose. Carbohydrate research, 29(1), 123-134.https://doi.org/10.1016/S0008-6215(00)82075-3
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