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Newly generated and increased bound phenolic in lychee pulp during heat-pump drying detected by UPLC-ESI-triple-TOF-MS/MS

文献类型： 外文期刊

作者： Shu, Bin 1 ; Wang, Junmin 3 ; Wu, Guangxu 6 ; Cao, Xuejiao 1 ; Huang, Fei 3 ; Dong, Lihong 3 ; Zhang, Ruifen 3 ; Liu, Hes 1 ;

作者机构： 1.Guangzhou Univ, Sch Chem & Chem Engn, Guangzhou 510006, Peoples R China

2.Zhejiang Wanli Univ, Zhejiang Prov Top Discipline Biol Engn Level A, Ningbo, Peoples R China

3.Guangdong Acad Agr Sci, Sericultural & Agrifood Res Inst, Guangzhou, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Funct Foods, Guangzhou, Peoples R China

5.Guangdong Key Lab Agr Prod Proc, Guangzhou, Peoples R China

6.Yangtze Univ, Coll Life Sci, Jingzhou, Peoples R China

关键词： flavonoid; bound phenolics; lychee; heat pump drying; HPLC-MS; MS

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：3.639； 五年影响因子：3.803 ）

ISSN： 0022-5142

年卷期：

页码：

收录情况： SCI

摘要： BACKGROUND During the thermal processing of fruit, it has been observed for phenolic compounds to either degrade, polymerize, or transfer into macromolecules. In this study, the bound and free phenolic compound composition, content, and phenolic-related enzyme activity of lychee pulp were investigated to determine whether the free phenolic had converted to bound phenolic during heat-pump drying (HPD). RESULTS It was found that after HPD, when compared with the fresh lychee pulp (control), the content of bound phenolics of dried lychee pulp had increased by 62.69%, whereas the content of free phenolics of dried lychee pulp decreased by 22.26%. It was also found that the antioxidant activity of bound phenolics had also increased after drying. With the use of high-performance liquid chromatography-tandem mass spectrometry, it was identified that (+)-gallocatechin, protocatechuic aldehyde, isorhamnetin-3-O-rutoside, 3,4-dihydroxybenzeneacetic acid, and 4-hydroxybenzoic acid were newly generated during HPD, when compared with the control sample. After drying, the contents of gallic acid, catechin, 4-hydroxybenzoic acid, vanillin, syringic acid, and quercetin in bound phenolics had also increased, and polyphenol oxidase and peroxidase still showed enzyme activity, which could be related to the conversion of free phenolics to bound phenolics. CONCLUSION Overall, during the thermal processing of lychee pulp, the free phenolics weres found to be converted into bound phenolics, new substances were generated, and antioxidant activity was increased. Hence, it was concluded that HPD improved the bound phenolics content of lychee pulp, thus providing theoretical support for the lychee processing industry. (c) 2021 Society of Chemical Industry.

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