TY - JOUR
T1 - Development of a non-thermal accelerated pulsed UV photolysis assisted digestion method for fresh and dried food samples
AU - Solís, C.
AU - Lagunas-Solar, M. C.
AU - Perley, B. P.
AU - Pia, C.
AU - Aguilar, L. F.
AU - Flocchini, R. G.
N1 - Funding Information:
The authors would like to thank the support of the Research Grant Program of the University of California, Davis's Crocker Nuclear Laboratory, and the staff technical support provided by Omar Carvacho, Timothy Essert, and Mark Van de Water. Corina Solı́s wishes to thank the support of DGAPA UNAM and CONACyT Grant 31545, and Luis F. Aguilar the support of the Chemistry & Agriculture Program at Crocker Nuclear Laboratory, during their respective scientific visits. This work is being continued with the support of the UC-Mexus – CONACyT Collaborative Grant Program (2001–2002).
PY - 2002/4
Y1 - 2002/4
N2 - A simple, fast digestion procedure for fresh and dried foods, using high-power pulsed UV photolysis in the presence of hydrogen peroxide, is being developed. The homogenized food samples were mixed with H2O2 or with a mixture of H2OM2 and HNO3, and irradiated for short times with a 248-nm UV excimer laser. After centrifugation, a clear, colorless solution was obtained and aliquots were deposited on Teflon filters for XRF and/or PIXE analyses. Standard reference materials (NIST Peach Leaves; Typical Diet) were also analyzed to compare recoveries and detection limits. Improvements in detection limits were observed, but a few trace elements (<1 ppm) were not reproducibly detected (Fe, Sr). This method proved to be practical for the accelerated digestion of food samples and preparing analytes in short-time intervals. In combination with PIXE and XRF, it allows high-sensitivity multi-elemental analyses for screening the nutritional elements and for food safety purposes regarding the potential presence of toxic elements. Further development to optimize and validate this procedure for a broader range of analytes is in progress.
AB - A simple, fast digestion procedure for fresh and dried foods, using high-power pulsed UV photolysis in the presence of hydrogen peroxide, is being developed. The homogenized food samples were mixed with H2O2 or with a mixture of H2OM2 and HNO3, and irradiated for short times with a 248-nm UV excimer laser. After centrifugation, a clear, colorless solution was obtained and aliquots were deposited on Teflon filters for XRF and/or PIXE analyses. Standard reference materials (NIST Peach Leaves; Typical Diet) were also analyzed to compare recoveries and detection limits. Improvements in detection limits were observed, but a few trace elements (<1 ppm) were not reproducibly detected (Fe, Sr). This method proved to be practical for the accelerated digestion of food samples and preparing analytes in short-time intervals. In combination with PIXE and XRF, it allows high-sensitivity multi-elemental analyses for screening the nutritional elements and for food safety purposes regarding the potential presence of toxic elements. Further development to optimize and validate this procedure for a broader range of analytes is in progress.
KW - Accelerated digestion
KW - PIXE
KW - Pulsed UV photolysis
KW - Trace elements
KW - XRF
UR - http://www.scopus.com/inward/record.url?scp=0036534893&partnerID=8YFLogxK
U2 - 10.1016/S0168-583X(01)00998-3
DO - 10.1016/S0168-583X(01)00998-3
M3 - Article
AN - SCOPUS:0036534893
SN - 0168-583X
VL - 189
SP - 77
EP - 80
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-4
ER -