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首页> 外文学位 >Anthocyanins and polyphenol oxidase from dried arils of pomegranate Punica granatum L.
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Anthocyanins and polyphenol oxidase from dried arils of pomegranate Punica granatum L.

机译：石榴石榴皮干燥假种皮中的花色苷和多酚氧化酶

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摘要

Anthocyanins are natural pigments responsible for red, purple, and blue coloration in plants. Human consumption of anthocyanins is increasing because of the rising awareness and interest in their potential health benefits. Pomegranate is one of the major source of polyphenolic phytochemicals, such as anthocyanins. Dried pomegranate raisins (anardana) are consumed in large quantities in Asian countries, and contain substantial amount of anthocyanins.;Five anthocyanins were found to be present in pomegranate raisins. Drying adversely affects the amount of anthocyanins, with polyphenol oxidase (PPO) playing a possible role in oxidative degradation of anthocyanins. In fresh pomegranate arils with intact cellular matrix, the intracellular membranes, such as those surrounding the vacuoles and other organelles, provide the compartmentalization that separates the anthocyanins from oxidative enzymes, such as PPO. Disruption of cellular membrane during processing leads to loss of this intracellular compartmentalization, resulting in the enzyme-substrate contact, and oxidative degradation of anthocyanins. Anthocyanins are heat stable compounds. Drying the pomegranate arils at high temperature for short period inactivates PPO, which may prevent the PPO-catalyzed anthocyanin oxidation, resulting in high anthocyanin containing raisins.
机译：花青素是负责植物中红色，紫色和蓝色着色的天然色素。人们对花色苷的潜在健康益处的认识和兴趣不断提高，因此人类对花色苷的消费量也在增加。石榴是花青素等多酚类植物化学物质的主要来源之一。干石榴葡萄干（花椰菜）在亚洲国家被大量食用，并且含有大量的花青素。石榴葡萄干中发现了五种花青素。干燥会对花青素的含量产生不利影响，而多酚氧化酶（PPO）在花青素的氧化降解中可能发挥作用。在具有完整细胞基质的新鲜石榴假种皮中，细胞内膜（例如围绕液泡和其他细胞器的膜）提供了将花青素与氧化酶（例如PPO）分开的分隔。在加工过程中细胞膜的破坏导致该细胞内区室化的丧失，导致酶-底物接触以及花色苷的氧化降解。花青素是热稳定的化合物。短时间在高温下干燥石榴假种皮会使PPO失活，这可能会阻止PPO催化的花青素氧化，从而导致高花青素的葡萄干。

著录项

  • 作者

    Jaiswal, Vidhanchandra.;

  • 作者单位

    University of the Sciences in Philadelphia.;

  • 授予单位 University of the Sciences in Philadelphia.;
  • 学科 Agriculture Food Science and Technology.;Chemistry Analytical.;Chemistry Agricultural.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 77 p.
  • 总页数 77
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农产品收获、加工及贮藏;农业化学;化学;
  • 关键词

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