某些农用工业副产品中的单宁水平及其聚合程度和比活性

H.P.S. Makkar, B. Singh, S.S. Negi
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引用次数: 40

摘要

采用各种化学和生物方法测定了15种农工副产物中的单宁。以总酚(TP)、缩合单宁(CT)和蛋白质沉淀能力(PPC)为单位的单宁含量在尼罗刺槐和可可豆荚、芒果仁、白穗果皮、麻瓜籽饼和栀子饼中都很高。PPC(生物活性指标)与TP(0.81)、聚合度(- 0.83)和蛋白质可沉淀酚类物质(0.96)的相关系数显著(P <0.05),而CT(0.34)差异无统计学意义。据推测,TP而不是CT对PPC有显著贡献,并且高度聚合的单宁不像低聚合的单宁那样有效地结合蛋白质。黄豆豆荚、大蓟豆荚、决明果种子、贵州藜饼、光蓬、石竹、巴西橡胶树饼、大麻木槿饼、白穗皮中TP和CT含量较低。在这些副产品中未检测到PPC,这表明在不存在其他有害因素的情况下,这九种副产品可以被认为是安全的,可以添加到牲畜饲料中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tannin levels and their degree of polymerisation and specific activity in some agro-industrial by-products

Tannins were determined by various chemical and biological methods in 15 agro-industrial by-products. Tannins in terms of total phenols (TP), condensed tannins (CT) and protein-precipitation capacity (PPC) were very high in Acacia nilotica and Theobroma cacao pods, Mangifera indica seed kernel, Panicum miliaceum polish and cakes of Madhuca indica seed and Garcinia indica. The correlation coefficients of PPC (measure of biological activity) with TP (0·81), degree of polymerisation (−0·83) and protein-precipitable phenolics (0·96) were significant (P < 0·05), but that with CT (0·34) was not significant. It is inferred that TP rather than CT contribute significantly towards PPC and that highly-polymerised tannins do not bind proteins as efficiently as the lesser-polymerised ones.

The TP and CT were low in pods of Prosopis juliflora and Pithecolobium saman, Cassia tora seeds, cakes of Guizotia abyssinica, Pongamia glabra, Schleichera oleosa, Hevea brasiliensis and Hibiscus cannabinus and Panicum miliaceum bran. The PPC could not be detected in these by-products, suggesting that these nine by-products can be considered safe for incorporation in livestock feed, subject to absence of other deleterious factors.

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