几种啤酒成分的分析

几种啤酒成分的分析(6400字)
摘  要：从总氮、α-氨态氮，还原糖，总酸，苦味质等五个方面对黑啤酒、纯生啤酒、冰啤酒、果味啤酒、特制啤酒五种啤酒进行了对比分析,主要结论如下：黑啤酒的总氮和氨态氮含量都最高，果味啤酒的总氮和氨态氮含量最低。黑啤酒的还原糖、总酸、苦味质含量均为最高，冰啤酒还原糖、总酸含量最低，果味啤酒苦味质含量最低。从营养角度考虑，黑啤酒与其他类型啤酒相比营养价值最高。
关键词：啤酒；营养成分；分析

The Analysis of Several Components of Beers
Abstract: Five kinds of beers have been analysed and compared based on the following aspects including the content of general nitrogen, α-amino acids nitrogen, reducing sugar, total acid and the bitter substance. The results were as follows: the content of general nitrogen and α-amino acids nitrogen of dark beer were higher than others and the fruity beer were the lowest; the content of reducing sugar, total acid and the bitter substance of dark beer were the highest while the content of reducing sugar, total acid of ice beer were the lowest, the fruity beer had the lowest bitter substance content. Thus from the aspect of nutrition, the dark beer had the highest nutrition value compared with other beers.
Key words: beer; nutrition; analysis
 

目    录
摘要     ……………………………………………………………………1
关键词  …………………………………………………………………… 1
    1前言    ……………………………………………………………………2                       
    2材料与方法  ………………………………………………………………3
2.1材料与设备………………………………………………………………3        
    2.2方法  ……………………………………………………………………3
    2.2.1总氮的测定——凯式定氮法  ………………………………………3
    2.2.2 α-氨态氮的测定——茚三酮比色法 ………………………………4   
2.2.3还原糖的测定——直接滴定法    …………………………………4
    2.2.4总酸的测定……………………………………………………………5
2.2.5苦味质的测定  ………………………………………………………5
3结果与分析  ………………………………………………………………5
    3.1几种啤酒中总氮含量的测定结果    …………………………………5
    3.2几种啤酒中α-氨态氮含量的测定结果…………………………………6
    3.21茚三酮比色法测出的样品的吸光度及谷氨酸吸光度 ………………6
    3.22谷氨酸吸光度标准曲线 ………………………………………………6
3.23茚三酮比色法测出的样品吸光度 ……………………………………7
3.24样品氨基酸含量   ……………………………………………………7
    3.3几种啤酒中还原糖含量的测定结果  …………………………………7
    3.4几种啤酒中总酸含量的测定结果  ……………………………………8
    3.5几种啤酒中苦味质含量的测定结果  …………………………………9
4 结论     …………………………………………………………………9
参考文献     ………………………………………………………………10
致谢   ………………………………………………………………………11