Publication : National Journal
Development of a Rapid Method for Chlorpyrifos Residue Determination in Chili using Near Infrared Spectroscopy
AbstractThis research was aimed to study the feasibility of near infrared spectroscopy (NIRs) technique for determination of chlorpyrifos residue in chili. A total of 102 organic chili samples cv. Chinda were prepared by homogenizing and then adding standard chlorpyrifos at the concentration range of 0.02-250 ppm. Determination of chlorpyrifos residue in sample was performed by gas chromatography–mass spectrometry (GC-MS). Spectral acquisition were measured from chili paste with reflectance mode, acetonitrile extracted solution with transflectance mode and dry extract system for near infrared (DESIR) technique of extracted solution with transmittance mode, in the wavelength of 800-2500 nm. It was found that the calibration model built from acetonitrile extracted solution gave the best performance with R2 = 0.9476, RMSECV = 12.8 ppm, RPD = 4.37 and bias = -0.434, while the calibration model built from chili paste spectra gave R2= 0.9439, RMSECV = 13.1 ppm , RPD = 4.22 and the calibration model of DESIR gave the worst performance with R2= 0.7240, RMSECV = 21.9 ppm, RPD = 1.9. When consider from R2 and RPD, NIRs was able to determine the chlorpyrifos residue in chili by measuring spectra from paste and acetonitrile extracted solution samples. However, it was found that the percentage error of the predicted values compared to the true values was very high especially for the samples with chlorpyrifos concentration less than 100 ppm. Therefore, more samples should be taken to build the new model.
AuthorAsst. Prof. Busarakorn Mahayothee, Ph.D.
Assoc. Prof.Pramote Khuwijitjaru, Ph.D.

MISSALEEYA LERDKUSON

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