食品科学 ›› 2006, Vol. 27 ›› Issue (10): 450-452.

• 分析检测 • 上一篇    下一篇

氧弹燃烧-灰化分光光度法测定胡麻卵磷脂的含磷量

 关明, 马红雄   

  1. 新疆师范大学生命与环境科学学院; 新疆吐鲁番地区第二实验中学
  • 出版日期:2006-10-15 发布日期:2011-11-16

Determination of Phosphorus in Flax Lecithin by the Oxygen Bomb Ashing Combustion and Spectrophotometry

 GUAN  Ming, MA  Hong-Xiong   

  1. 1.Life and Environment Science Institute, Xinjiang Normal University, Urumqi 830054, China;2.Xinjiang Turpan No.2 Middle School, Turpan 830000, China
  • Online:2006-10-15 Published:2011-11-16

摘要: 采用氧弹燃烧灰化进行样品的预处理,用水作为吸收剂进行吸收,然后用磷钼蓝分光光度法测定精制胡麻卵磷脂的含磷量,检测波长为690nm,结果表明在0.4×10-4~3.2×10-4mg/ml范围内浓度与吸光度呈良好的线性关系,相关系数r=0.9994;考察了显色时间对测定结果的影响,选择了最佳的沸水浴时间,精密度实验和准确度实验结果满足含量测定要求,平均回收率为99.7%,RSD=1.46%;样品含磷量测定结果为4.68%,超过国家标准(≥2.70%)。该方法准确、简单、易行,可以直接应用于测定胡麻卵磷脂的含磷量。

关键词: 氧弹, 灰化, 分光光度法, 胡麻卵磷脂, 含磷量

Abstract: The paper introduces a simple method of determining the phosphorus in flax lecithin. At first the sample was combusted by oxygen bomb ashing combustion, then the products were absorbed by water, finally, the content of the phospho- rus was determined by P-Mo-blue spetrophotometry, the measure wavelength is 690nm, the result showed that there is a good linear relation between absorbance and concentration at the range of 0.4×10-4~3.2×10-4mg/ml, r =0.9994; the paper also investigate the influence of the developing time on determining result, choose the best boiling water bathing time, precision and accuracy experimental result meets the requirement, the average recovery rate is 99.7%, RSD =1.46%; the phosphorus content of the sample is 4.68%, exceeding 2.70% of the index number of the national standard. The method is accurate, simple, feasible, suitable for determination of the phosphorus content in the flax lecithin.

Key words: oxygen bomb, ashing, spectrophotometry, flax lecithin, phosphorus content