24小时热门版块排行榜    

查看: 901  |  回复: 11

liangxingqiu

金虫 (正式写手)


[交流] 交流

请问虫子们:你们有没有做过油脂里的总酚含量测定?我们现在测遇到了一些问题,很无助,周围都没有人在做,不知道该怎么继续了?
回复此楼

» 猜你喜欢

» 抢金币啦!回帖就可以得到:

查看全部散金贴

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
2楼2012-04-25 15:21:02
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

tangbohejin

木虫之王 (文学泰斗)



liangxingqiu(金币+1): 谢谢参与
没找到
3楼2012-04-25 15:37:24
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liangxingqiu

金虫 (正式写手)


引用回帖:
2楼: Originally posted by sesame_oil at 2012-04-25 15:21:02:
http://www.instrument.com.cn/download/shtml/179958.shtml

不是生育酚,是总酚
4楼2012-04-25 15:42:23
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

qiaqia832

铜虫 (正式写手)



liangxingqiu(金币+1): 谢谢参与
请问你用的什么方法,福林酚法测的吗,出现什么问题了?个人觉得要测的话你得先把总酚提取出来再测,我只测过果汁的,用的是福林酚法和高效液相
5楼2012-04-25 15:49:12
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liangxingqiu

金虫 (正式写手)


引用回帖:
5楼: Originally posted by qiaqia832 at 2012-04-25 15:49:12:
请问你用的什么方法,福林酚法测的吗,出现什么问题了?个人觉得要测的话你得先把总酚提取出来再测,我只测过果汁的,用的是福林酚法和高效液相

是的,福林酚法,我们是测油的总酚含量,先用正己烷和甲醇提取出来,再测,按照文献上的操作,但是吸光度却很低,假若增加样品溶液的量又会产生沉淀。Briefly for the extraction of phenolic compounds,
10 g of oil was mixed with hexane (50 ml). This mixture
was placed into a separation funnel and 20 ml of methanol:
water (60:40, w:w) was added. The mixture was
shaken for 2 min and the separated water phase was
removed. This procedure was applied three times and all
the water phases were combined and used for TP analysis.
For TP analysis, the mixture of the sample solution
(50 ll), distilled water (3 ml), 250 ll Folin–Ciocalteu’s
reagent solution, and 7% Na2CO3 (750 ll) was vortexed
and incubated for 8 min at room temperature. Then
950 ll of distilled water was added. The mixture was
allowed to stand for 2 h at room temperature. The
absorbance was measured at 765 nm against distilled
water as blank
6楼2012-04-25 17:38:58
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liangxingqiu(金币+1): 谢谢参与
可以去西北农林的食品学院看看,有这个专业

[ 发自手机版 http://muchong.com/3g ]
7楼2012-04-25 18:15:37
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

myselfsky8159

木虫 (著名写手)



liangxingqiu(金币+1): 谢谢参与
遇到什么问题了?
8楼2012-04-25 20:37:07
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

liangxingqiu

金虫 (正式写手)


引用回帖:
8楼: Originally posted by myselfsky8159 at 2012-04-25 20:37:07:
遇到什么问题了?

我们是测油的总酚含量,先用正己烷和甲醇提取出来,再测,按照文献上的操作,但是吸光度却很低,才0.08左右,代到标曲里面算到的总酚含量也很低,明显错的。假若增加样品溶液的量又会产生沉淀。方法是:Briefly for the extraction of phenolic compounds,
10 g of oil was mixed with hexane (50 ml). This mixture
was placed into a separation funnel and 20 ml of methanol:
water (60:40, w:w) was added. The mixture was
shaken for 2 min and the separated water phase was
removed. This procedure was applied three times and all
the water phases were combined and used for TP analysis.
For TP analysis, the mixture of the sample solution
(50 ll), distilled water (3 ml), 250 ll Folin–Ciocalteu’s
reagent solution, and 7% Na2CO3 (750 ll) was vortexed
and incubated for 8 min at room temperature. Then
950 ll of distilled water was added. The mixture was
allowed to stand for 2 h at room temperature. The
absorbance was measured at 765 nm against distilled
water as blank
9楼2012-04-25 22:48:24
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

majiaona

木虫 (著名写手)



liangxingqiu(金币+1): 谢谢参与
好像有国标的吧
10楼2012-04-25 23:26:11
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

qiaqia832

铜虫 (正式写手)


引用回帖:
6楼: Originally posted by liangxingqiu at 2012-04-25 17:38:58:
是的,福林酚法,我们是测油的总酚含量,先用正己烷和甲醇提取出来,再测,按照文献上的操作,但是吸光度却很低,假若增加样品溶液的量又会产生沉淀。Briefly for the extraction of phenolic compounds,
10 g  ...

吸光值低,可能是总酚含量太低,可以考虑浓缩一下提取液,用旋转蒸发浓缩,或者真空干燥,这样试试看。要么就换个提取方法。
11楼2012-04-26 08:20:54
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

threestone5868

铁杆木虫 (著名写手)



liangxingqiu(金币+1): 谢谢参与
国标啊
12楼2012-04-27 22:35:27
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 liangxingqiu 的主题更新
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 北科281学硕材料求调剂 +6 tcxiaoxx 2026-03-20 6/300 2026-03-22 20:23 by edmund7
[考研] 环境学硕288求调剂 +6 皮皮皮123456 2026-03-22 6/300 2026-03-22 16:52 by i_cooler
[考研] 354求调剂 +7 Tyoumou 2026-03-18 10/500 2026-03-22 11:11 by 人来盛
[考研] 一志愿华中科技大学071000,求调剂 +4 沿岸有贝壳6 2026-03-21 4/200 2026-03-22 07:21 by ilovexiaobin
[考研] 299求调剂 +5 shxchem 2026-03-20 7/350 2026-03-21 17:09 by ColorlessPI
[考研] 085601调剂 358分 +3 zzzzggh 2026-03-20 4/200 2026-03-21 10:21 by luoyongfeng
[考研] 一志愿天津大学化学工艺专业(081702)315分求调剂 +12 yangfz 2026-03-17 12/600 2026-03-21 03:30 by JourneyLucky
[考研] 307求调剂 +3 wyyyqx 2026-03-17 3/150 2026-03-21 03:20 by JourneyLucky
[考研] 一志愿重庆大学085700资源与环境专硕,总分308求调剂 +3 墨墨漠 2026-03-18 3/150 2026-03-21 00:39 by JourneyLucky
[考研] 一志愿武汉理工材料工程专硕调剂 +9 Doleres 2026-03-19 9/450 2026-03-20 22:36 by JourneyLucky
[考研] 求调剂,一志愿:南京航空航天大学大学 ,080500材料科学与工程学硕,总分289分 +4 @taotao 2026-03-19 4/200 2026-03-20 22:14 by JourneyLucky
[考研] 295材料求调剂,一志愿武汉理工085601专硕 +5 Charlieyq 2026-03-19 5/250 2026-03-20 20:35 by JourneyLucky
[考研] 广西大学家禽遗传育种课题组2026年硕士招生(接收计算机专业调剂) +3 123阿标 2026-03-17 3/150 2026-03-20 15:58 by 飞行琦
[考研] 298-一志愿中国农业大学-求调剂 +9 手机用户 2026-03-17 9/450 2026-03-20 14:24 by 无懈可击111
[考研] 320求调剂0856 +3 不想起名字112 2026-03-19 3/150 2026-03-19 22:53 by 学员8dgXkO
[考研] 286求调剂 +6 lemonzzn 2026-03-16 10/500 2026-03-19 14:31 by lemonzzn
[考研] 085601专硕,总分342求调剂,地区不限 +5 share_joy 2026-03-16 5/250 2026-03-18 14:48 by haxia
[考研] 考研求调剂 +3 橘颂. 2026-03-17 4/200 2026-03-17 21:43 by 有只狸奴
[考博] 26申博 +4 八6八68 2026-03-16 4/200 2026-03-17 13:00 by 轻松不少随
[考研] 一志愿南京大学,080500材料科学与工程,调剂 +4 Jy? 2026-03-16 4/200 2026-03-17 11:02 by gaoqiong
信息提示
请填处理意见