Standard infrared absorption spectrum of betaine and optimal conditions for its measurement
Standard infrared absorption spectrum of betaine and optimal conditions for its measurement
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DOI：
10.3358/shokueishi.47.232
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发表时间：
2006-10-01
期刊：
影响因子：
--
通讯作者：
Tanamoto, Kenichi
中科院分区：
文献类型：
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作者：
Kitamura, Youji;Iwasaki, Toshinobu;Tanamoto, Kenichi
在日本，红外吸收（IR）光谱通常用作食品添加剂鉴别试验的标准参考。在甜菜碱的情况下，已经报道了许多不同的红外光谱，因此，有必要建立一个红外光谱，是可重复的和可靠的，足以作为一个标准的识别。本研究从预处理、方法选择、测定技术等方面探讨了获得标准红外光谱的适宜条件。溴化钾压片法是一种湿度依赖性测定甜菜碱的方法，甜菜碱与溴化钾之间存在相互作用。通过在105 ℃下用五氧化二磷干燥甜菜碱3小时，然后通过液体石蜡（Nujol）糊法测量IR光谱，可以获得适合作为标准的可再现IR光谱。
The infrared absorption (IR) spectrum is often used as a standard reference in identification tests of food additives in Japan. In the case of betaine, many different IR spectra have been reported and, therefore, it is necessary to establish an IR spectrum that is reproducible and reliable enough to be used as a standard for identification. In the present study, suitable conditions to obtain a standard IR spectrum were examined from various viewpoints, including pretreatment, selection of method, and measuring technique. The KBr disk method, which has generally been used to identify betaine, was found to be humidity-dependent, and there was also an interaction between betaine and KBr. A reproducible IR spectrum suitable as a standard could be obtained by drying betaine at 105 degrees C for 3 hours over phosphorus pentoxide, and then measuring the IR spectrum by the liquid paraffin (Nujol) paste method.