食品科学 ›› 2006, Vol. 27 ›› Issue (4): 196-198.

• 分析检测 • 上一篇    下一篇

DNS法测定木糖含量时最佳测定波长的选择

 王文岭, 黄雪松   

  1. 暨南大学理工学院食品科学与工程系
  • 出版日期:2006-04-15 发布日期:2011-09-13

Identification of Optimum Wavelength Assayed by DNS Method for Determination of Xylose Content

 WANG  Wen-Ling, HUANG  Xue-Song   

  1. Department of Food Science and Technology, Jinnan University, Guangzhou 510632, China
  • Online:2006-04-15 Published:2011-09-13

摘要: 为了正确地选择DNS法测定木糖含量时的最佳测定波长,扫描了木糖与DNS试剂反应液的紫外-可见吸收光谱(400~700nm),并分析测定了其在480、500、520、540、550、560nm时的OD值。结果表明:木糖与DNS试剂反应液的最大吸收波长在480~490nm;在480nm波长下测定时,灵敏度最高,且于150~600μg/ml范围内呈现较好的线性关系,其回归系数r值=0.99997,回收率大于99.6%。在500、520、540、550、560nm测定时,灵敏度依次降低。因此,DNS法测定木糖时的最佳测定波长为480nm。

关键词: DNS法, 木糖, 最佳波长

Abstract:  The paper’s aim was to get the optimum wavelength for the determination of xylose content by DNS method. The reaction solution of xylose and DNS regent was scanned from 400~700nm,and the OD values were determined, respectively. The results showed that the max absorption is from 480~490nm, and the line range of the method is 150~600μg/ml (r=0.99997) xylose at 480nm. The result also showed the sensitivity, accuracy, precision are the highest at 480nm, and the recollection rate is more than 99.5%. Therefore, the optimum wavelength is 480nm when the xylose is determined by the DNS method.

Key words:  , DNS method; xylose; optimum wavelength;