Rapid and non-destructive determination of rancidity levels in butter cookies by multi-spectral imaging

• Published in: Journal of the science of food and agriculture Vol. 96; no. 5; pp. 1821 - 1827
• Main Authors: Xia, Qing, Liu, Changhong, Liu, Jinxia, Pan, Wenjuan, Lu, Xuzhong, Yang, Jianbo, Chen, Wei, Zheng, Lei
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 30.03.2016; John Wiley and Sons, Limited
• Subjects: Butter; butter cookies; Cookies; Desserts; Food Analysis - methods; Food contamination & poisoning; Food Quality; Food science; Foods; Hydrogen-Ion Concentration; Imaging; Mathematical models; Moisture content; multi-spectral imaging; non-destructive; Peroxides; Peroxides - chemistry; Rancidity; rancidity monitoring; Scientific imaging; Spectrum Analysis - methods; Water - chemistry; multi-spectral imaging; rancidity monitoring; butter cookies; non-destructive
• ISSN: 0022-5142; 1097-0010
• DOI: 10.1002/jsfa.7292

BACKGROUND Rancidity is an important attribute for quality assessment of butter cookies, while traditional methods for rancidity measurement are usually laborious, destructive and prone to operational error. In the present paper, the potential of applying multi‐spectral imaging (MSI) technology with 19 wavelengths in the range of 405–970 nm to evaluate the rancidity in butter cookies was investigated. RESULTS Moisture content, acid value and peroxide value were determined by traditional methods and then related with the spectral information by partial least squares regression (PLSR) and back‐propagation artificial neural network (BP‐ANN). The optimal models for predicting moisture content, acid value and peroxide value were obtained by PLSR. The correlation coefficient (r) obtained by PLSR models revealed that MSI had a perfect ability to predict moisture content (r = 0.909), acid value (r = 0.944) and peroxide value (r = 0.971). CONCLUSION The study demonstrated that the rancidity level of butter cookies can be continuously monitored and evaluated in real‐time by the multi‐spectral imaging, which is of great significance for developing online food safety monitoring solutions. © 2015 Society of Chemical Industry