24小时热门版块排行榜    

查看: 670  |  回复: 2
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

muyehenmei

铜虫 (小有名气)

[求助] 测植物蔗糖合成酶和蔗糖磷酸合成酶时的疑惑?

Enzyme activities were determined in leaf extracts, because in our view this method provides reliable data on the enzyme activity ratios in vivo. A leaf sample (1–1.5 g) was fixed with liquid nitrogen and ground in a mortar. An extracting medium (8–10 ml) containing 50 mM Hepes–NaOH (pH 7.5), 5 mM MgCl2, 1 mM EDTA, 2.5 mM dithiothreitol, and 0.5% BSA was gradually added during grinding. The homogenate was filtered through eight layers of cheesecloth and centrifuged at 20000 g for 15 min. The supernatant was dialyzed for 3 h against a tenfold volume of the extracting medium diluted 2.5 times (this medium was free of BSA but contained 10 mM 2-mercaptoethanol). After dialysis, the extract was used as an enzyme preparation.All procedures were performed at 4℃.

在提取蔗糖合成酶和蔗糖磷酸合成酶时,8层纱布过滤作用是什么?要用透析缓冲液透析3h,作用是什么?可不可以省略这两步啊?求大神指点。有更简单的提取和测量方法吗?
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

水煮鱼麻麻

新虫 (初入文坛)

【答案】应助回帖

这两部是除去杂质和盐的,是有必要的。我们没有做这两部就做不出来
3楼2015-10-08 11:25:47
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 3 个回答
信息提示
请填处理意见