caa a22 4500 465796222 CHVBK 20180323112038.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF02541854 doi (NATIONALLICENCE)springer-10.1007/BF02541854 Determination of the country of origin of pistachio nuts by DSC and HPLC [Elektronische Daten] [Susan Dyszel, Bruce Pettit] The laboratories of the U.S. Customs Service frequently encounter the major analytical problem of determining the country of origin of imported commodities. This is particularly challenging with natural products. This paper will describe the process for one such commodity —pistachio nuts. Two approaches were taken, high performance liquid chromatography (HPLC) and Differential Scanning Calorimetry (DSC). It was found that the results of these two techniques were complimentary and confirmatory. The HPLC data was obtained on the petroleum ether soluble fraction of the pistachio nuts while the DSC runs evaluated both this fraction and the whole nut. The HPLC results were further investigated by collecting fractions from the eluting peaks, derivatizing them to form the methyl ester of the fatty acids, and profiling by gas chromatography to confirm the triglycerides originally present. The U.S. Customs Service is currently using DSC area ratios to screen imported pistachio nuts for country of origin. American Oil Chemists' Society (AOCS), 1990 County of origin nationallicence DSC nationallicence GC nationallicence HPLC nationallicence pistachio nuts nationallicence triglycerides nationallicence Dyszel Susan U.S. Customs Service, 1301 Constitution Ave., NW Rm. 7113, 20229, Washington, D.C. aut Pettit Bruce U.S. Customs Service, 1301 Constitution Ave., NW Rm. 7113, 20229, Washington, D.C. aut Journal of the American Oil Chemists' Society Springer-Verlag 67/12(1990-12-01), 947-951 0003-021X 67:12<947 1990 67 11746 https://doi.org/10.1007/BF02541854 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02541854 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dyszel Susan U.S. Customs Service, 1301 Constitution Ave., NW Rm. 7113, 20229, Washington, D.C aut NATIONALLICENCE 700 1- Pettit Bruce U.S. Customs Service, 1301 Constitution Ave., NW Rm. 7113, 20229, Washington, D.C aut NATIONALLICENCE 773 0- Journal of the American Oil Chemists' Society Springer-Verlag 67/12(1990-12-01), 947-951 0003-021X 67:12<947 1990 67 11746 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer