title: Detection and quantification of anionic detergent (lissapol) in milk using attenuated total reflectance-Fourier Transform Infrared spectroscopy.
abstract: Adulteration of milk to gain economic benefit is rampant. Addition of detergent in milk can cause food poisoning and other complications. Fourier Transform Infrared spectroscopy was evaluated as rapid method for detection and quantification of anionic detergent (lissapol) in milk. Spectra of pure and artificially adulterated milk (0.2-2.0% detergent) samples revealed clear differences in wavenumber range of 4000-500cm-1. The apparent variations observed in region of 1600-995 and 3040-2851cm-1corresponds to absorption frequencies of common constituents of detergent (linear alkyl benzene sulphonate). Principal component analysis showed discrete clustering of samples based on level of detergent (p⩽0.05) in milk. The classification efficiency for test samples were recorded to be >93% using Soft Independent Modelling of Class Analogy approach. Maximum coefficient of determination for prediction of detergent was 0.94 for calibration and 0.93 for validation, using partial least square regression in wavenumber combination of 1086-1056, 1343-1333, 1507-1456, 3040-2851cm-1.
authors.affiliation: Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana 141004, India.
authors.forename: Pranita
authors.initials: P
authors.lastname: Jaiswal
authors.affiliation: Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana 141004, India. Electronic address: snjha_ciphet@yahoo.co.in.
authors.forename: Shyam Narayan
authors.initials: SN
authors.lastname: Jha
authors.affiliation: Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana 141004, India.
authors.forename: Jaspreet
authors.initials: J
authors.lastname: Kaur
authors.affiliation: Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana 141004, India.
authors.forename: Anjan
authors.initials: A
authors.lastname: Borah
mesh_terms: D000818:Animals; D002138:Calibration; D003902:Detergents / Q000032:analysis*; D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis; D016018:Least-Squares Analysis; D008892:Milk / Q000737:chemistry*; D025341:Principal Component Analysis; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D003902:Detergents
keywords: Adulteration; Lissapol; PCA; PLS; SIMCA; Spectroscopy