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Prediction of specialty coffee cup quality based on near infrared spectra of green coffee beans.
Talanta. 2016 Apr 01; 150:367-74.T

Abstract

The growing global demand for specialty coffee increases the need for improved coffee quality assessment methods. Green bean coffee quality analysis is usually carried out by physical (e.g. black beans, immature beans) and cup quality (e.g. acidity, flavour) evaluation. However, these evaluation methods are subjective, costly, time consuming, require sample preparation and may end up in poor grading systems. This calls for the development of a rapid, low-cost, reliable and reproducible analytical method to evaluate coffee quality attributes and eventually chemical compounds of interest (e.g. chlorogenic acid) in coffee beans. The aim of this study was to develop a model able to predict coffee cup quality based on NIR spectra of green coffee beans. NIR spectra of 86 samples of green Arabica beans of varying quality were analysed. Partial least squares (PLS) regression method was used to develop a model correlating spectral data to cupping score data (cup quality). The selected PLS model had a good predictive power for total specialty cup quality and its individual quality attributes (overall cup preference, acidity, body and aftertaste) showing a high correlation coefficient with r-values of 90, 90,78, 72 and 72, respectively, between measured and predicted cupping scores for 20 out of 86 samples. The corresponding root mean square error of prediction (RMSEP) was 1.04, 0.22, 0.27, 0.24 and 0.27 for total specialty cup quality, overall cup preference, acidity, body and aftertaste, respectively. The results obtained suggest that NIR spectra of green coffee beans are a promising tool for fast and accurate prediction of coffee quality and for classifying green coffee beans into different specialty grades. However, the model should be further tested for coffee samples from different regions in Ethiopia and test if one generic or region-specific model should be developed.

Authors+Show Affiliations

College of Agriculture and Veterinary Medicine, Jimma University, P.O. Box 307, Jimma, Ethiopia. Electronic address: kasech_tolassa@yahoo.com.KERMIT, Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure links 653, B-9000 Gent, Belgium. Electronic address: rademaker.michael@gmail.com.KERMIT, Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure links 653, B-9000 Gent, Belgium. Electronic address: Bernard.DeBaets@UGent.be.Isotope Bioscience Laboratory - ISOFYS, Ghent University, Coupure Links 653, B-9000 Gent, Belgium. Electronic address: Pascal.Boeckx@UGent.be.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26838420

Citation

Tolessa, Kassaye, et al. "Prediction of Specialty Coffee Cup Quality Based On Near Infrared Spectra of Green Coffee Beans." Talanta, vol. 150, 2016, pp. 367-74.
Tolessa K, Rademaker M, De Baets B, et al. Prediction of specialty coffee cup quality based on near infrared spectra of green coffee beans. Talanta. 2016;150:367-74.
Tolessa, K., Rademaker, M., De Baets, B., & Boeckx, P. (2016). Prediction of specialty coffee cup quality based on near infrared spectra of green coffee beans. Talanta, 150, 367-74. https://doi.org/10.1016/j.talanta.2015.12.039
Tolessa K, et al. Prediction of Specialty Coffee Cup Quality Based On Near Infrared Spectra of Green Coffee Beans. Talanta. 2016 Apr 1;150:367-74. PubMed PMID: 26838420.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prediction of specialty coffee cup quality based on near infrared spectra of green coffee beans. AU - Tolessa,Kassaye, AU - Rademaker,Michael, AU - De Baets,Bernard, AU - Boeckx,Pascal, Y1 - 2015/12/17/ PY - 2015/09/14/received PY - 2015/12/11/revised PY - 2015/12/14/accepted PY - 2016/2/4/entrez PY - 2016/2/4/pubmed PY - 2016/12/15/medline KW - Coffee quality KW - NIR spectra KW - PLS model and specialty coffee SP - 367 EP - 74 JF - Talanta JO - Talanta VL - 150 N2 - The growing global demand for specialty coffee increases the need for improved coffee quality assessment methods. Green bean coffee quality analysis is usually carried out by physical (e.g. black beans, immature beans) and cup quality (e.g. acidity, flavour) evaluation. However, these evaluation methods are subjective, costly, time consuming, require sample preparation and may end up in poor grading systems. This calls for the development of a rapid, low-cost, reliable and reproducible analytical method to evaluate coffee quality attributes and eventually chemical compounds of interest (e.g. chlorogenic acid) in coffee beans. The aim of this study was to develop a model able to predict coffee cup quality based on NIR spectra of green coffee beans. NIR spectra of 86 samples of green Arabica beans of varying quality were analysed. Partial least squares (PLS) regression method was used to develop a model correlating spectral data to cupping score data (cup quality). The selected PLS model had a good predictive power for total specialty cup quality and its individual quality attributes (overall cup preference, acidity, body and aftertaste) showing a high correlation coefficient with r-values of 90, 90,78, 72 and 72, respectively, between measured and predicted cupping scores for 20 out of 86 samples. The corresponding root mean square error of prediction (RMSEP) was 1.04, 0.22, 0.27, 0.24 and 0.27 for total specialty cup quality, overall cup preference, acidity, body and aftertaste, respectively. The results obtained suggest that NIR spectra of green coffee beans are a promising tool for fast and accurate prediction of coffee quality and for classifying green coffee beans into different specialty grades. However, the model should be further tested for coffee samples from different regions in Ethiopia and test if one generic or region-specific model should be developed. SN - 1873-3573 UR - https://www.unboundmedicine.com/medline/citation/26838420/Prediction_of_specialty_coffee_cup_quality_based_on_near_infrared_spectra_of_green_coffee_beans_ DB - PRIME DP - Unbound Medicine ER -