摘要
二氢异构化啤酒花浸膏是啤酒花中的一个主要的软树脂成分α-酸经异构化成异α-酸后氢化还原制备的产物,具有苦味平和、无后苦味等特点,是异α-酸的还原产物中溶解度最好的一个产品。在正交试验的基础上,通过进一步的单因素试验考察异α-酸加氢还原为二氢异α-酸的工艺条件。结果表明,反应温度、催化剂NaBH4的用量、KOH与异α-酸的物质的量比及反应时间等都与反应产物二氢异α-酸的收率有直接关系,其影响程度依次减弱,合成二氢异α-酸的最佳工艺条件为氢氧化钾与异α-酸的物质的量比1:1、NaBH4与异α-酸的物质的量比0.25:1、反应温度100℃、反应时间2h。在此条件下,进一步的放大实验证明,反应收率可达97%以上。
Dihydro-iso-alpha-acids are the products of isomerization followed by hydrogenation of alpha-acids as one kind of the main soft resins in flower cone of hops （Humulus lupulus L.） and show a slightly bitter taste and the best solubility among all hydrogenation products of isomerizd alpha-acids. Single factor and orthogonal array design methods were used to deal with the effects of reaction temperature and time and amounts of added NaBH4 and KOH to iso-alpha-acids on dihydro-iso-alpha-acid yield. Results indicated that the above reaction conditions all exhibited an obvious effect on dihydro-iso-alpha-acid yield in the decreasing order： reaction temperature amount of added KOH amount of added NaBH4 reaction time and their optimal values were as follows： a reaction system composed of iso-alpha-acids, KOH and NaBH4 at 1：1：0.25 molar ratio left to react for 2 h at 100 ℃. Two-, 3-and 5-fold scale-up experiments carried out under such conditions all gave over 97% dihydro-iso-α-acids yields.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2010年第10期112-116,共5页
Food Science
基金
新疆维吾尔自治区科技支疆计划项目(200991247)
