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Authenticity green coffee bean species and geographical origin using near-infrared spectroscopy combined with chemometrics
Authors:Quan Nguyen Minh  Quoc Dat Lai  Hoang Nguy Minh  Minh Tu Tran Kieu  Ngoc Lam Gia  Uyen Le  My Phung Hang  Hoang Dung Nguyen  Tran Diem Ai Chau  Ngoc Thuc Trinh Doan
Affiliation:1. Department of Food Technology, Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, 72506 Vietnam;2. Department of Food Technology, Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, 72506 Vietnam

Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam

Contribution: Supervision (lead), Writing - review & editing (lead);3. Department of Food Technology, Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, 72506 Vietnam

Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam

Contribution: Supervision (equal), Writing - review & editing (equal)

Abstract:To prevent the adulteration of agricultural resources and provide a solution to enhance the green coffee bean supply chain, authentication using the near-infrared spectroscopy (NIRS) technique was investigated. Partial least square with discrimination analysis (PLS-DA) models combined with various preprocessing methods were built from NIR spectra of 153 Vietnamese green coffee samples. The model combined with the standard normal variate and the first order of derivative yielded excellent performance in predicting coffee species with the error cross-validation of 0.0261. PLS-DA model of mean centre and first-order derivative spectra also yielded good performance in verifying geographical indication of green coffee with the error of 0.0656. By contrast, the predicting abilities of post-harvest methods were poor. The overall results showed a high potential of the NIRS in online authentication practices.
Keywords:NIR spectroscopy  PLS-DA  geographical origin  green coffee bean  Classification  species
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