FOOD SCIENCE ›› 2018, Vol. 39 ›› Issue (9): 33-38.doi: 10.7506/spkx1002-6630-201809006

• Basic Research • Previous Articles     Next Articles

Comparison of Bioactive Compounds, Antioxidant Activity and α-Glucosidase Inhibition Activity of Five By-Products from Lotus Seed Production

ZHANG Lu1, HUANG Xiangxia1, TU Zongcai1,2,*, ZHAO Yi1, WANG Hui2, WANG Hao1, SHA Xiaomei1, ZHANG Shuya1   

  1. 1. College of Life Science, Jiangxi Normal University, Nanchang 330022, China; 2. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
  • Online:2018-05-15 Published:2018-05-15

Abstract: A large amount of lotus receptacle, epicarp, and seed skin are discarded every year without any further utilization. Thus, this study was designed to compare the potentials in high-value utilization of lotus leaf, receptacle, epicarp, seed skin and plumule. The contents of major bioactive compounds in extracts from these materials were measured, and the antioxidant activities and hypoglycemic potential were analyzed with three antioxidant models and α-glucosidase inhibitory assay, respectively. The results indicated that lotus receptacle extract had the highest contents of phenols (232.50 mg GAE/g) and triterpenoids (423.75 mg OAE/g), while the highest content of flavonoids (41.48 mg QuE/g) and condensed tannins (36.13 mg CaE/g) was found in lotus leaf and lotus seed skin extract, respectively. In addition, lotus receptacle extract showed the strongest antioxidant and α-glucosidase inhibition. The 1,1-diphenyl-2-picrylhydrazyl scavenging ability, 2,2’-azino-bis-(3-ethylbenzthiazoline-6-sulphonate) scavenging ability and α-glucosidase inhibition were 2.64, 1.17 and 85 folds higher than that of the positive control, respectively. Furthermore, lotus seed skin extract had the second highest antioxidant ability; the α-glucosidase inhibition of lotus leaf, lotus receptacle, lotus epicarp, and lotus seed skin was higher than that of acarbose. Correlation analysis indicated that phenolics and condensed tannins contributed the most to free radical scavenging and α-glucosidase inhibitory activity, whereas flavonoids contributed the most to reducing power. Thus, lotus receptacle has considerable antioxidant and hypoglycemic activities, and phenolics, flavnoids and condensed tannins are the major bioactive compounds, and therefore it needs to be further investigated for in vivo activity against hyperglycaemia, diabetes and diabetic complication.

Key words: lotus by-products, lotus receptacle, polyphenols, antioxidant activity, α-glucosidase inhibition activity

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