Abstract
Chinese water chestnut (CWC) is one of the most popular foods among Asian people due to its special taste and medical function. Experiments were conducted to test the antioxidant activity and then determine the major phenolic compound components present in CWC. CWC phenolic extract strongly inhibited linoleic acid oxidation and exhibited a dose-dependent free-radical scavenging activity against alpha,alpha-diphenyl-beta-picrylhydrazyl (DPPH) radicals, superoxide anions and hydroxyl radicals, which was superior to ascorbic acid and butylated hydroxytoluene (BHT), two commercial used antioxidants. Furthermore, the CWC extract was found to have a relatively higher reducing power, compared with BHT. The major phenolic compounds present in CWC tissues were extracted, purified and identified by high-performance liquid chromatograph (HPLC) as (-)-gallocatechin gallate, (-)-epicatechin gallate and (+)-catechin gallate. This study suggests that CWC tissues exhibit great potential for antioxidant activity and may be useful for their nutritional and medicinal functions.
Highlights
Excessive free radical production and lipid peroxidation are involved in the pathogenesis of some chronic diseases, including atherosclerosis, cardiac and cerebral ischemia, neurodegenerative disorders, carcinogenesis, diabetes, and rheumatic disorders [1,2,3,4]
Liu et al isolated a functional compound from Chinese water chestnut (CWC), 24-ethylcholesta∆7-cholesterol, which had obvious in vivo and in vitro antimicrobial effects on bacteria, inhibited many kinds of inflammation and showed visible activity against pain caused by acetic acid [11]
Peaks 1, 2 and 3 were identified, as (-)-gallocatechin gallate, (-)-epicatechin gallate and (+)-catechin gallate, respectively (Figure 2), according to their spectral characteristics and retention times in comparison with commercial pure compounds. These major phenolic compounds contributed more than 60% of the total phenolic content (2.53 mg/g on fresh weight basis)
Summary
Excessive free radical production and lipid peroxidation are involved in the pathogenesis of some chronic diseases, including atherosclerosis, cardiac and cerebral ischemia, neurodegenerative disorders, carcinogenesis, diabetes, and rheumatic disorders [1,2,3,4]. They play a major role in the aging process [5,6]. Liu et al isolated a functional compound from Chinese water chestnut (CWC), 24-ethylcholesta∆7-cholesterol, which had obvious in vivo and in vitro antimicrobial effects on bacteria, inhibited many kinds of inflammation and showed visible activity against pain caused by acetic acid [11]. Little information is available on the phenolic compound constituents present in CWC and their antioxidant activity
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