title: Portable visible and near-infrared spectrophotometer for triglyceride measurements.
abstract: An affordable and portable machine is required for the practical use of visible and near-infrared (Vis-NIR) spectroscopy. A portable fruit tester comprising a Vis-NIR spectrophotometer was modified for use in the transmittance mode and employed to quantify triglyceride levels in serum in combination with a chemometric analysis. Transmittance spectra collected in the 600- to 1100-nm region were subjected to a partial least-squares regression analysis and leave-out cross-validation to develop a chemometrics model for predicting triglyceride concentrations in serum. The model yielded a coefficient of determination in cross-validation (R2VAL) of 0.7831 with a standard error of cross-validation (SECV) of 43.68 mg/dl. The detection limit of the model was 148.79 mg/dl. Furthermore, masked samples predicted by the model yielded a coefficient of determination in prediction (R2PRED) of 0.6856 with a standard error of prediction (SEP) and detection limit of 61.54 and 159.38 mg/dl, respectively. The portable Vis-NIR spectrophotometer may prove convenient for the measurement of triglyceride concentrations in serum, although before practical use there remain obstacles, which are discussed.
authors.affiliation: Department of Virology, Center for Infectious Disease Control, Research Institute for Microbial Diseases, Osaka University, Yamadaoka, Osaka 565-0871, Japan.
authors.forename: Takanori
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Yukiko Hakariya
authors.initials: YH
authors.lastname: Kato
authors.forename: Megumi
authors.initials: M
authors.lastname: Tsukamoto
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Ikuta
authors.forename: Akikazu
authors.initials: A
authors.lastname: Sakudo
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D016018:Least-Squares Analysis; D008297:Male; D008875:Middle Aged; D008956:Models, Chemical; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D019265:Spectroscopy, Near-Infrared / Q000191:economics / Q000295:instrumentation* / Q000379:methods; D014280:Triglycerides / Q000097:blood*
chemical_list: D014280:Triglycerides