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Continuous temperature-dependent Raman spectroscopy of melamine and structural analog detection in milk powder.
Appl Spectrosc. 2015 Mar; 69(3):398-406.AS

Abstract

Hyperspectral Raman imaging has the potential for rapid screening of solid-phase samples for potential adulterants. We can improve mixture analysis algorithms by defining a temperature range in which the contaminant spectrum changes dramatically and uniquely compared with unadulterated material. Raman spectra were acquired for urea, biuret, cyanuric acid, and melamine (pure and at 1% in dried milk powder) from 50 to 310 °C with a gradient of 1 °C min(-1). Adulterants were clearly indentified in the milk powder. Specific frequencies that were mainly associated with ring breathing, stretching, and in-plane deformation shifted with respect to temperature up to 12 cm(-1) in all four molecules. Specific frequencies significantly increased/decreased in intensity within narrow temperature ranges independent of whether the amine was mixed in milk. Correlation of Raman and differential scanning calorimetry data identified structural components and vibrational modes, which concur with or trigger phase transitions.

Authors+Show Affiliations

Environmental Microbiology and Food Safety Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Building 303, BARC-East, 10300 Baltimore Blvd., Beltsville, MD 20705 USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25664966

Citation

Schmidt, Walter F., et al. "Continuous Temperature-dependent Raman Spectroscopy of Melamine and Structural Analog Detection in Milk Powder." Applied Spectroscopy, vol. 69, no. 3, 2015, pp. 398-406.
Schmidt WF, Broadhurst CL, Qin J, et al. Continuous temperature-dependent Raman spectroscopy of melamine and structural analog detection in milk powder. Appl Spectrosc. 2015;69(3):398-406.
Schmidt, W. F., Broadhurst, C. L., Qin, J., Lee, H., Nguyen, J. K., Chao, K., Hapeman, C. J., Shelton, D. R., & Kim, M. S. (2015). Continuous temperature-dependent Raman spectroscopy of melamine and structural analog detection in milk powder. Applied Spectroscopy, 69(3), 398-406. https://doi.org/10.1366/14-07600
Schmidt WF, et al. Continuous Temperature-dependent Raman Spectroscopy of Melamine and Structural Analog Detection in Milk Powder. Appl Spectrosc. 2015;69(3):398-406. PubMed PMID: 25664966.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Continuous temperature-dependent Raman spectroscopy of melamine and structural analog detection in milk powder. AU - Schmidt,Walter F, AU - Broadhurst,C Leigh, AU - Qin,Jianwei, AU - Lee,Hoyoung, AU - Nguyen,Julie K, AU - Chao,Kuanglin, AU - Hapeman,Cathleen J, AU - Shelton,Daniel R, AU - Kim,Moon S, Y1 - 2015/02/01/ PY - 2015/2/10/entrez PY - 2015/2/11/pubmed PY - 2015/12/17/medline SP - 398 EP - 406 JF - Applied spectroscopy JO - Appl Spectrosc VL - 69 IS - 3 N2 - Hyperspectral Raman imaging has the potential for rapid screening of solid-phase samples for potential adulterants. We can improve mixture analysis algorithms by defining a temperature range in which the contaminant spectrum changes dramatically and uniquely compared with unadulterated material. Raman spectra were acquired for urea, biuret, cyanuric acid, and melamine (pure and at 1% in dried milk powder) from 50 to 310 °C with a gradient of 1 °C min(-1). Adulterants were clearly indentified in the milk powder. Specific frequencies that were mainly associated with ring breathing, stretching, and in-plane deformation shifted with respect to temperature up to 12 cm(-1) in all four molecules. Specific frequencies significantly increased/decreased in intensity within narrow temperature ranges independent of whether the amine was mixed in milk. Correlation of Raman and differential scanning calorimetry data identified structural components and vibrational modes, which concur with or trigger phase transitions. SN - 1943-3530 UR - https://www.unboundmedicine.com/medline/citation/25664966/Continuous_temperature_dependent_Raman_spectroscopy_of_melamine_and_structural_analog_detection_in_milk_powder_ DB - PRIME DP - Unbound Medicine ER -