摘要
本文报道了邻苯二胺与丁二酮在１ｍｏｌ／ＬＨ＿２ＳＯ＿４介质中反应生成２，３－二甲基喹喔啉。该化合物具有较强的荧光（λ＿（ｅｘ）／λ＿（ｅｍ）＝３４０ｎｍ／４９０ｎｍ），其荧光量子产率Φ＿Ｆ＝０．１０１。丁二酮浓度在４．０×１０￣（－７）～５．２×１０￣５ｍｏｌ／Ｌ范围内与转化成产物的相对荧光强度呈线性关系，相对标准偏差为１％，检出限为１．３×１０￣（－７）ｍｏｌ／Ｌ。考察了３０种物质表明，该法选择性好，用于实际啤酒样品中丁二酮的测定，结果令人满意。
The reaction of o-phenylenediamine withdiacetyl is described,the product 2,3-dimethylquinoxaline(DMQX) has strong fluo-rescence(λ_(ex)/λ_(ex)=340nm/490nm).The fluo-rescent quantum yield Φ_f of DMQX in lmol/LH_2SO_4 is 0.101.There is a fine linear relation-ship between the fluorescent intensity of theproduct and the concentration of diacetyl in therange of 4. 0×10￣(-7)～5.2×10￣(-5)mol/L, The RS D is 1%. The detection limit is 1.3 ×10￣(-7)mol/L. This method has good selectivity andhas been applied to the determination of di-acetyl in beers with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第3期45-47,共3页
Chinese Journal of Analysis Laboratory
关键词
邻苯二胺
丁二酮
啤酒
荧光法
Fluorescence
o-phenylenedi-amine
diacetyl
beer
