The influence of pH on auto-oxidative browning of flavan-3-ols and gallic acid as a promising browning inhibitor
文献类型: 外文期刊
作者: Junfeng Tan;Jean Paul Vincken;Mark G. Sanders;Zhi Lin;Wouter J.C. de Bruijn
作者机构:
关键词: Brown;Catechins;Color;Discoloration;oxidation;Tea;Yellow
期刊名称: Food Chemistry
ISSN: 0308-8146
年卷期: 2025 年 473 卷
页码:
收录情况: SCIE(2025版) ; ; EI(2025版)
摘要: The effect of pH and of flavan-3-ols' structural features on undesired auto-oxidative browning of ready-to-drink green tea is still largely unknown. Thus, we investigated auto-oxidative browning of epicatechin (EC), epicatechin gallate (ECg), epigallocatechin (EGC), epigallocatechin gallate (EGCg) in pH-regulated aqueous model systems. In the typical pH range of green tea infusions (pH 5–7), the brown color intensity of flavan-3-ols after auto-oxidation was found to be EC > ECg > EGCg > EGC. Characterization of brown auto-oxidation products by RP-UHPLC-ESI-HRMSn revealed that most of these can only be formed through multi-step reactions. Therefore, oxidation potentials of the starting flavan-3-ols are unsuitable for predicting browning. Browning inhibition in real green tea can be achieved by maintaining a pH below 4 with either conventional additives (i.e. ascorbic or citric acid) or with gallic acid, a compound naturally abundant in tea. In conclusion, gallic acid is a promising candidate for clean-label auto-oxidative browning inhibition.
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