Yang Ziming, Zhang Li, Wu Yuan-Hang, Li Dian-Peng, Li Wei
Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China.
School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China.
Foods. 2022 Nov 28;11(23):3837. doi: 10.3390/foods11233837.
Litchi pericarp is the main byproduct of litchi processing and contains several polyphenols. However, the chemical constituents and the antioxidant effect in litchi pericarp extracts (LPE) have been rarely studied. The result of the quantitative analyses of the major monomers in LPE indicated that procyanidin A2, procyanidin B2, epicatechin, rutin, and catechin were the major polyphenol compounds of LPE. The LPE exhibited high radical scavenging activity, as indicated by the results of the 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ascorbic acid, 2,2'-Azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) tests. Moreover, administrating D-galactose in mice led to the reduced activity of antioxidant enzymes, aggravated lipid peroxidation, and induced protein oxidation. The results were improved in the aging mice after the LPE treatment was performed. The above results suggest that LPE has an excellent antioxidant effect. Accordingly, litchi pericarp can serve as a promising source of dietary antioxidants.
荔枝果皮是荔枝加工的主要副产品，含有多种多酚类物质。然而，对荔枝果皮提取物（LPE）的化学成分和抗氧化作用的研究却很少。LPE中主要单体的定量分析结果表明，原花青素A2、原花青素B2、表儿茶素、芦丁和儿茶素是LPE的主要多酚化合物。1,1-二苯基-2-苦基肼（DPPH）和抗坏血酸、2,2'-联氮双（3-乙基苯并噻唑啉-6-磺酸）（ABTS）试验结果表明，LPE具有较高的自由基清除活性。此外，给小鼠注射D-半乳糖会导致抗氧化酶活性降低、脂质过氧化加剧并诱导蛋白质氧化。在对衰老小鼠进行LPE处理后，这些结果得到了改善。上述结果表明，LPE具有优异的抗氧化作用。因此，荔枝果皮有望成为膳食抗氧化剂的良好来源。
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