单宁对天然石榴（Punica granatum L.）汁中花色苷和颜色的影响。
Effects of condensed tannins on anthocyanins and colour of authentic pomegranate (Punica granatum L.) juices.
机构信息
Institute of Food Safety, Ankara University, Diskapi Campus, Diskapi, 06110 Ankara, Turkey.
Department of Food Engineering, Faculty of Engineering, Ankara University, Diskapi, Ankara 06110, Turkey.
出版信息
Food Chem. 2014 Dec 1;164:324-31. doi: 10.1016/j.foodchem.2014.05.048. Epub 2014 May 20.
This study was conducted to determine the effects of condensed tannins (CT) on anthocyanins (ACNs) and colour of pomegranate juice (PJ) samples obtained from nine registered varieties in Turkey. CT-catechins (CTCs) reactive to vanillin and phloroglucinol adducts of CT contents were determined. CTC and ACN contents of PJs highly depended on variety (p<0.01), and ranged from 31 to 155 mg/L juice and from 47 to 405 mg/L juice, respectively. As catechin-phloroglucinol content increased, ACN content also increased (r=0.866). Strong logarithmic correlation between the ratio of ACN contents to catechin-phloroglucinol contents and polymeric colour (PC) values of the samples was found (r=-0.822). When PC value of PJs was ⩾8% or ratio of ACN contents to catechin-phloroglucinol contents of PJs was ⩽2.82, ACN contents of the samples determined by spectrophotometric method were higher than those determined by HPLC.
本研究旨在确定土耳其九个注册品种的石榴汁（PJ）样品中原花青素（ACNs）和颜色受单宁（CT）的影响。测定了对香草醛和邻苯三酚加合物有反应的 CT-儿茶素（CTCs）。PJ 中的 CTC 和 ACN 含量高度依赖于品种（p<0.01），分别在每升果汁 31 至 155 毫克和 47 至 405 毫克的范围内变化。随着儿茶素-邻苯三酚含量的增加，ACN 含量也增加（r=0.866）。样品的 ACN 含量与儿茶素-邻苯三酚含量的比值与聚合色（PC）值之间存在强对数相关性（r=-0.822）。当 PJ 的 PC 值 ⩾8%或 PJ 的 ACN 含量与儿茶素-邻苯三酚含量的比值 ⩽2.82 时，分光光度法测定的样品 ACN 含量高于 HPLC 法测定的 ACN 含量。
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