99精品久久久久精品双飞_人与禽性视频77777_久久精品人人做人人爽_欧美性受XXXX

聯系(xi)電話(hua) 17717068667

當前位置:首頁  >  技術文章  >  祎鴻定(ding)氮儀工作原(yuan)理介(jie)紹

祎鴻定氮儀工作原理介紹

更新時間:2015-09-24      點擊次數:1246

定(ding)(ding)(ding)氮儀,是(shi)檢測種(zhong)子、乳制品、飲(yin)料、飼料、土壤(rang)及其他農副產品中(zhong)(zhong)氮含(han)量(liang)的(de)(de)儀器(qi)。定(ding)(ding)(ding)氮儀是(shi)根據蛋白質(zhi)中(zhong)(zhong)氮的(de)(de)含(han)量(liang)恒(heng)定(ding)(ding)(ding)的(de)(de)原(yuan)理,通過測定(ding)(ding)(ding)樣品中(zhong)(zhong)氮的(de)(de)含(han)量(liang)從而(er)計算(suan)蛋白質(zhi)含(han)量(liang)的(de)(de)儀器(qi)。因其蛋白質(zhi)含(han)量(liang)測量(liang)計算(suan)的(de)(de)方(fang)法叫做凱氏定(ding)(ding)(ding)氮法,故被(bei)稱為凱氏定(ding)(ding)(ding)氮儀,又(you)名蛋白質(zhi)測定(ding)(ding)(ding)儀、粗(cu)蛋白測定(ding)(ding)(ding)儀。該儀器(qi)也是(shi)食品廠、飲(yin)用水廠,藥品檢驗,肥料測定(ding)(ding)(ding)中(zhong)(zhong)廣泛應用。


工作原理


 凱氏(shi)定(ding)(ding)(ding)氮(dan)(dan)(dan)法(fa)是測(ce)定(ding)(ding)(ding)化(hua)合物或混合物中總氮(dan)(dan)(dan)量的(de)一種(zhong)方法(fa)。即在有催化(hua)劑(ji)的(de)條件下(xia),用濃硫酸(suan)消(xiao)化(hua)樣品(pin)將(jiang)有機氮(dan)(dan)(dan)都轉變成無機銨鹽,然后在堿性條件下(xia)將(jiang)銨鹽轉化(hua)為氨(an),隨水(shui)蒸氣蒸餾出(chu)來并為過(guo)量的(de)硼酸(suan)液(ye)吸收,再以標準鹽酸(suan)滴定(ding)(ding)(ding),就(jiu)可計算出(chu)樣品(pin)中的(de)氮(dan)(dan)(dan)量。由(you)于(yu)蛋(dan)白質(zhi)(zhi)含(han)(han)氮(dan)(dan)(dan)量比較恒(heng)定(ding)(ding)(ding),可由(you)其氮(dan)(dan)(dan)量計算蛋(dan)白質(zhi)(zhi)含(han)(han)量,故此法(fa)是經典的(de)蛋(dan)白質(zhi)(zhi)定(ding)(ding)(ding)量方法(fa)。因其蛋(dan)白質(zhi)(zhi)含(han)(han)量測(ce)量計算的(de)方法(fa)叫做凱氏(shi)定(ding)(ding)(ding)氮(dan)(dan)(dan)法(fa),故被稱為凱氏(shi)定(ding)(ding)(ding)氮(dan)(dan)(dan)儀,又(you)名定(ding)(ding)(ding)氮(dan)(dan)(dan)儀、蛋(dan)白質(zhi)(zhi)測(ce)定(ding)(ding)(ding)儀、粗蛋(dan)白測(ce)定(ding)(ding)(ding)儀。