Application of Hand-Held and Portable Infrared Spectrometers in Bovine Milk Analysis

Author(s)

Santos, Poliana M. ^{[1, 2]} ; Pereira-Filho, Edenir R. ^[1] ; Rodriguez-Saona, Luis E. ^[2]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, BR-13560 Sao Carlos, SP - Brazil

^[2] Ohio State Univ, Dept Food Sci & Technol, Columbus, OH 43210 - USA

• Document type: Journal article
• Source: Journal of Agricultural and Food Chemistry; v. 61, n. 6, p. 1205-1211, FEB 13 2013.
• Web of Science Citations: 38

Abstract

A simple and fast method for the detection and quantification of milk adulteration was developed using portable and hand-held infrared (IR) spectrometers. Milk samples were purchased from local supermarkets (Columbus, OH, USA) and spiked with tap water, whey, hydrogen peroxide, synthetic urine, urea, and synthetic milk in different concentrations. Spectral data were collected using mid-infrared (MIR) and near-infrared (NIR) spectrometers. Soft independent modeling of class analogy (SIMCA) classification models exhibited tight and well-separated clusters allowing the discrimination of control from adulterated milk samples. Partial least-squares regression (PLSR) was used to estimate adulteration levels, and results showed high coefficients of determination (R-2) and low standard errors of prediction (SEP). Classification and quantification models indicated that the tested MIR systems were superior to NIR systems in monitoring milk adulteration. This method can be potentially used as an alternative to traditional methods due to their simplicity, sensitivity, low energy cost, and portability. (AU)

• FAPESP's process: 09/01345-6 - Application of digital image and spectroanalytical techniques combined with chemometric analysis to detect and quantify adulteration in bovine milk
• Grantee: Poliana Macedo dos Santos
• Support Opportunities: Scholarships in Brazil - Doctorate