In vitro digestibility of raw starches extracted from five yam (Dioscorea spp.) species grown in Jamaica
In vitro digestibility of raw starches extracted from five yam (Dioscorea spp.) species grown in Jamaica
复制标题
从牙买加种植的五种山药（薯蓣属）中提取的生淀粉的体外消化率
DOI：
10.1002/star.200300195
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发表时间：
2004-02-01
期刊：
影响因子：
2.3
通讯作者：
Asemota, HN
中科院分区：
文献类型：
--
作者：
Riley, CK;Wheatley, AO;Asemota, HN
对产于牙买加的圆叶黄山药、黑山药、甜山药、苦山药和中国山药的淀粉颗粒进行了分离和表征。测定了直链淀粉含量、颗粒大小、结晶度和α-淀粉酶消化率。所得颗粒为三种晶型。圆叶黄山药、黑山药、甜山药为B型，苦山药为C型，苦山药为A型。圆叶黄山药的直链淀粉含量最高(26.5%)，山药的直链淀粉含量最低(11.1%)。山药颗粒大小为1~3微米，圆叶黄山药为16~42微米。颗粒饲料的消化率有显著差异。α-淀粉酶(猪胰腺α-淀粉酶，pH 5.5，0.02%CaCl2，40℃，24 h)对山药和苦山药粗淀粉的降解率最高，分别为21.27+/-0.01%和18.11+/-0.02%，圆叶黄山药、黑山药和甜山药最不容易被酶降解，分别为13.74+/-0.03%，14.98+/-0.08%和15.32+/-0.04%。
Starch granules from Round leaf yellow yam, Negro yam, Sweet yam, Bitter yam and Chinese yam grown in Jamaica were isolated and characterized. The amylose content, granular size, crystallinity, and digestibility by a-amylase were determined. The granules obtained were of three crystalline types. Round leaf yellow yam, Negro yam and Sweet yam were found to be type-B, while Chinese yam and Bitter yam were type-C and type-A, respectively. Round leaf yellow yam had the highest amylose content (26.5%) while Chinese yam had the lowest (11.1%). The granule size varied between 1-3 mum for Chinese yam and 16-42 mum for Round leaf yellow yam. Significant variations in digestibility of the granules were observed. Raw starches from Chinese yam and Bitter yam were the most susceptible to alpha-amylase digestion (porcine pancreatic alpha-amylase, pH 5.5, 0.02% CaCl2, 40degreesC, 24 h) with 21.27 +/- 0.01 % and 18.11 +/- 0.02% degradation, respectively, while Round leaf yellow yam, Negro yam and Sweet yam starches were the least susceptible, with 13.74 +/- 0.03%, 14.98 +/- 0.08%, and 15.32 +/- 0.04% enzymatic degradation, respectively.