浙江农业学报

• 食品科学 • 上一篇    下一篇

乌洋芋与紫薯营养成分比较

  

  1. (1 成都农业科技职业学院,四川 成都 611130;2 四川省农业科学院 土壤检测中心,四川 成都 610066)
  • 出版日期:2014-09-25 发布日期:2014-10-11

Comparison of nutrient composition between purple potato and purple sweet potato

  1. (1 Chengdu Vocational college of Agricultural Sciences and Technology, Chengdu 611130, China;2 Soil Testing Center, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China)
  • Online:2014-09-25 Published:2014-10-11

摘要: 乌洋芋与紫薯外观颜色相近,参照国标及农业行业标准,采用凯氏定氮法、原子吸收分光光度法、氨基酸分析等方法对其水分、淀粉、粗蛋白质、粗脂肪、还原性糖、干物质、矿质元素、色素、维生素,以及氨基酸等营养指标进行比较分析。结果表明,紫薯所含的还原性糖、干物质、微量元素Zn,以及色素中的矢车菊素,芍药素和β-胡萝卜素均明显高于乌洋芋,且差异极显著(P<001);而乌洋芋中的淀粉含量极显著(P<001)高于紫薯。从氨基酸组成来看,紫薯中的总氨基酸、必需氨基酸、非必需氨基酸、甜味氨基酸与苦味氨基酸均极显著(P<001)高于乌洋芋;但乌洋芋的氨基酸比值系数组成比较集中,部分比值系数也比紫薯略高。总体来看,紫薯色素含量高,味甜,微量元素锌和氨基酸含量均较高,而乌洋芋淀粉多,综合营养价值高,消费者可根据自己需要进行有目的的选择。

关键词: 乌洋芋, 紫薯, 营养成分

Abstract: Purple potato and purple sweet potato exhibited similar colors. According to the national standard, the nutrient composition including water, starch, protein, fat, reducing sugar, dry matter, mineral elements, pigment, vitamin, amino acids were compared between purple potato and purple sweet potato, using atomic absorption spectrophotometry, and amino acid analysis. It was shown that the contents of reducing sugar, dry matter, Zn, and pigments such as cyanidin, peonin and β\|carotene in purple sweet potato were significantly (P<001) higher than that in purple potato, while, the starch content in purple potato was significantly (P<001) higher than that in purple sweet potato. The contents of total amino acids, essential amino acids, non\|essential amino acids, sweet amino acids and bitter amino acids in purple sweet potato were significantly (P<001) higher than that in purple potato. But, the ratio coefficient of amino acids was more concentrated in purple potato, along with a higher score of ratio coefficient of amino acids.

Key words: purple potato, purple sweet potato, nutrient composition