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請問蟲子們:你們有沒有做過油脂里的總酚含量測定?我們現(xiàn)在測遇到了一些問題,很無助,周圍都沒有人在做,不知道該怎么繼續(xù)了? |
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是的,福林酚法,我們是測油的總酚含量,先用正己烷和甲醇提取出來,再測,按照文獻(xiàn)上的操作,但是吸光度卻很低,假若增加樣品溶液的量又會產(chǎn)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 |
金蟲 (文壇精英)
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我們是測油的總酚含量,先用正己烷和甲醇提取出來,再測,按照文獻(xiàn)上的操作,但是吸光度卻很低,才0.08左右,代到標(biāo)曲里面算到的總酚含量也很低,明顯錯的。假若增加樣品溶液的量又會產(chǎn)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 |
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