Iron and zinc in vitro availability in pearl millet flours (Pennisetum glaucum) with varying phytate, tannin, and fiber contents
Iron and zinc in vitro availability in pearl millet flours (Pennisetum glaucum) with varying phytate, tannin, and fiber contents
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DOI：
10.1021/jf0480593
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发表时间：
2005-04-20
影响因子：
6.1
通讯作者：
Tréche, S
中科院分区：
文献类型：
--
作者：
Lestienne, I;Besançon, P;Tréche, S
用于估计体外铁和锌利用率的胃肠道消化模拟，对两种样品进行了模拟：(i)全珍珠粟粉中植酸含量降低的样品；（ii）未脱盐或脱盐的两种珍珠粟颗粒样品，一种是纤维和单宁含量低的去皮部分，一种是纤维和单宁含量高的麸皮部分。在IP6未完全降解的情况下，植酸降解可显著提高全珍珠小米粉的铁和锌的体外利用率。去皮部分的脱藻作用显著提高了铁和锌的体外利用率，而麸皮部分的脱藻作用对铁和锌的体外利用率没有影响。即使植酸盐参与降低珍珠粟粉中铁和锌的体外利用率，纤维和单宁也通过螯合谷壳中高比例的铁和锌发挥重要作用。
Simulations of gastro-intestinal digestion, used to estimate in vitro iron and zinc availability, were performed on two kinds of samples: (i) samples with decreased phytate contents from whole pearl millet flour and (ii) nondephytinized or dephytinized samples from two pearl millet grain fractions, a decorticated fraction with low fiber and tannin contents and a bran fraction with high fiber and tannin contents. Iron and zinc in vitro availabilities of whole pearl millet flour were significantly improved by phytate degradation, even if the IP6 were not all degraded. Total dephytinization of decorticated fraction led to a marked increase in iron and zinc in vitro availabilities, but that of bran fraction had no effect on either iron or zinc in vitro availability. Even if phytates are involved in reducing in vitro iron and zinc availability in pearl millet flour, fibers and tannins play an important role by chelating a high proportion of iron and zinc in grain hulls.