三聚氰胺含量测定

Measurement of melamine content

在小麦面筋蛋白、奶粉及其他含蛋白的粉类产品的生产中，三聚氰胺污染物的测定是重要的安全考虑。排除蛋白质含量影响的三聚氰胺含量的测定是非常关键的步骤。三聚氰胺与蛋白质分子均含有大量的氮元素，此相同之处导致了三聚氰胺含量测定的困难。在不测定蛋白质含量变化的情况下，而测定三聚氰胺浓度是本篇报告的重点。

In the production of wheat gluten,milk powder,or other protein containing powders,measurement of melamine con- tamination is an important safety consideration.Determination of melamine content independent from protein content is the critical step.Melamine and protein molecules each contains considerable amounts of nitrogen.This similarity makes it difficult to measure melamine.The ability to measure melamine concentration without detecting change in protein content is the focus of this application report. Melamine can be continuously measured online in real- time using the Spectra-Quad Online Constituent Analyzer from Thermo Fisher Scientific.The Spectra-Quad uses a measurement technique based on Near Infrared(NIR)light absorption.It is a non-contact,non-destructive and non- hazardous method.The sensor illuminates the sample with NIR light at a wavelength that the constituent of interest,such as melamine,absorbs.The light is very low intensity and does not heat or damage the sample.The sensor measures reflected light.The more melamine present,the less light is reflected. The reflected light is inversely proportional to the amount of the constituent(melamine). The Specn'a-Quad sensor can be located over any existing conveyor.The SpectraQuad can also measure melamine in pneumatically conveyed product through the use of a powder sampler.The data can be outputted to a process control system or PC based controller.Melamine contamination detection is a continuous measurement.Product can be guaranteed safe from melamine contamination.