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Article

Structural and Biological Properties of Water Soluble Polysaccharides from Lotus Leaves: Effects of Drying Techniques

by 1,2, 1,3,*, 3,4, 1,4, 1 and 1,*
1
Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
2
School of Basic Medical Sciences, Chengdu University, Chengdu 610106, China
3
Institute of Food Processing and Safety, College of Food Science, Sichuan Agricultural University, Ya’an 625014, China
4
Research Center for Plants and Human Health, Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Lesław Juszczak and Janusz Kapusniak
Molecules 2021, 26(15), 4395; https://doi.org/10.3390/molecules26154395
Received: 4 June 2021 / Revised: 15 July 2021 / Accepted: 18 July 2021 / Published: 21 July 2021
(This article belongs to the Special Issue Food Polysaccharides: Structure, Properties and Application)
In the present study, the influence of five drying techniques on the structural and biological properties of polysaccharides from lotus leaves (LLPs) was investigated. Results revealed that the yields, contents of basic chemical components, molecular weights, and molar ratios of compositional monosaccharides of LLPs varied by different drying technologies. Low molecular weight distributions were observed in polysaccharides obtained from lotus leaves by hot air drying (LLP-H), microwave drying (LLP-M), and radio frequency drying (LLP-RF), respectively. The high contents of bound polyphenolics were measured in LLP-H and LLP-M, as well as polysaccharides obtained from lotus leaves by vacuum drying (LLP-V). Furthermore, both Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectra of LLPs were similar, indicating that drying technologies did not change their basic chemical structures. Besides, all LLPs exhibited obvious biological properties, including in vitro antioxidant capacities, antiglycation activities, and inhibitory effects on α-glucosidase. Indeed, LLP-H exhibited higher 2,2-azidobisphenol (3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging ability (IC50 values, LLP-H, 0.176 ± 0.004 mg/mL; vitamin C, 0.043 ± 0.002 mg/mL) and 2,2-diphenyl-1-(2,4,6-trinitrate phenyl) hydrazine radical scavenging ability (IC50 values, LLP-H, 0.241 ± 0.007 mg/mL; butylated hydroxytoluene, 0.366 ± 0.010 mg/mL) than others, and LLP-M exerted stronger antiglycation (IC50 values, LLP-M, 1.023 ± 0.053 mg/mL; aminoguanidine, 1.744 ± 0.080 mg/mL) and inhibitory effects on α-glucosidase (IC50 values, LLP-M, 1.90 ± 0.02 μg/mL; acarbose, 724.98 ± 16.93 μg/mL) than others. These findings indicate that both hot air drying and microwave drying can be potential drying techniques for the pre-processing of lotus leaves for industrial applications. View Full-Text
Keywords: lotus leaf; polysaccharides; drying techniques; structural properties; antioxidant; antiglycation; α-glucosidase inhibition lotus leaf; polysaccharides; drying techniques; structural properties; antioxidant; antiglycation; α-glucosidase inhibition
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MDPI and ACS Style

Li, W.; Wu, D.-T.; Li, F.; Gan, R.-Y.; Hu, Y.-C.; Zou, L. Structural and Biological Properties of Water Soluble Polysaccharides from Lotus Leaves: Effects of Drying Techniques. Molecules 2021, 26, 4395. https://doi.org/10.3390/molecules26154395

AMA Style

Li W, Wu D-T, Li F, Gan R-Y, Hu Y-C, Zou L. Structural and Biological Properties of Water Soluble Polysaccharides from Lotus Leaves: Effects of Drying Techniques. Molecules. 2021; 26(15):4395. https://doi.org/10.3390/molecules26154395

Chicago/Turabian Style

Li, Wei, Ding-Tao Wu, Fen Li, Ren-You Gan, Yi-Chen Hu, and Liang Zou. 2021. "Structural and Biological Properties of Water Soluble Polysaccharides from Lotus Leaves: Effects of Drying Techniques" Molecules 26, no. 15: 4395. https://doi.org/10.3390/molecules26154395

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