| 光谱学与光谱分析 |
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| Identification of Pearl Powder Using Microscopic Infrared Reflectance Spectroscopy |
| ZHANG Xuan1, HU Chao1, YAN Yan1, YANG Hai-feng1, LI Jun-fang1, BAI Hua1, XI Guang-cheng1*, LIAO Jie2 |
1. Inspection and Research Center of Nanomaterials and Nanoproducts, Chinese Academy of Inspection and Quarantine, Beijing 100123, China
2. Zhejiang Fenix Pearl Biological Technology Co. Ltd., Zhuji 311804, China |
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Abstract Pearl is a precious ornament and traditional Chinese medicine, which application history in China is more than 2000 years. It is well known that the chemical ingredients of shell and pearl are very similar, which all of them including calcium carbonate and various amino acids. Generally, shell powders also can be used as medicine; however, its medicinal value is much lower than that of pearl powders. Due to the feature similarity between pearl powders and shell powders, the distinguishment of them by detecting chemical composition and morphology is very difficult. It should be noted that shell powders have been often posing as pearl powders in markets, which seriously infringes the interests of consumers. Identification of pearl powder was investigated by microscopic infrared reflectance spectroscopy, and pearl powder as well as shell powder was calcined at different temperatures for different time before infrared reflectance spectroscopy analysis. The experimental results indicated that when calcined at 400 ℃ for 30 minutes under atmospheric pressure, aragonite in pearl powder partly transformed into calcite, while aragonite in shell powder completely transformed into calcite. At the same time, the difference in phase transition between the pearl powders and shell powders can be easily detected by using the microscopic infrared reflectance spectroscopy. Therefore, based on the difference in their phase transition process, infrared reflectance spectroscopy can be used to identify phase transformation differences between pearl powder and shell powder. It’s more meaningfully that the proposed infrared reflectance spectroscopy method was also investigated for the applicability to other common counterfeits, such as oyster shell powders and abalone shell powders, and the results show that the method can be a simple, efficiently and accurately method for identification of pearl powder.
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Received: 2013-09-13
Accepted: 2014-01-25
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Corresponding Authors:
XI Guang-cheng
E-mail: xiguangcheng@caiq.gov.cn
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