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Foods 2017, 6(5), 38; doi:10.3390/foods6050038

Rapid Prediction of Moisture Content in Intact Green Coffee Beans Using Near Infrared Spectroscopy

1
Division Quality of Plant Products, Department of Crop Sciences, University of Goettingen, Carl-Sprengel-Weg 1, 37075 Goettingen, Germany
2
Institute for Application Techniques in Plant Protection, Julius Kühn Institute, Messeweg 11/12, 38140 Braunschweig, Germany
3
Department of Animal Sciences, University of Goettingen, Albrecht-Thaer-Weg 3, D-37075 Goettingen, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Theo H. Varzakas and Charalampos Proestos
Received: 10 March 2017 / Revised: 4 May 2017 / Accepted: 17 May 2017 / Published: 19 May 2017
(This article belongs to the Special Issue Qualitative Analysis of Food Products)
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Abstract

Moisture content (MC) is one of the most important quality parameters of green coffee beans. Therefore, its fast and reliable measurement is necessary. This study evaluated the feasibility of near infrared (NIR) spectroscopy and chemometrics for rapid and non-destructive prediction of MC in intact green coffee beans of both Coffea arabica (Arabica) and Coffea canephora (Robusta) species. Diffuse reflectance (log 1/R) spectra of intact beans were acquired using a bench top Fourier transform NIR instrument. MC was determined gravimetrically according to The International Organization for Standardization (ISO) 6673. Samples were split into subsets for calibration (n = 64) and independent validation (n = 44). A three-component partial least squares regression (PLSR) model using raw NIR spectra yielded a root mean square error of prediction (RMSEP) of 0.80% MC; a four component PLSR model using scatter corrected spectra yielded a RMSEP of 0.57% MC. A simplified PLS model using seven selected wavelengths (1155, 1212, 1340, 1409, 1724, 1908, and 2249 nm) yielded a similar accuracy (RMSEP: 0.77% MC) which opens the possibility of creating cheaper NIR instruments. In conclusion, NIR diffuse reflectance spectroscopy appears to be suitable for rapid and reliable MC prediction in intact green coffee; no separate model for Arabica and Robusta species is needed. View Full-Text
Keywords: quality; rapid methods; infrared spectroscopy; Coffea arabica (Arabica); Coffea canephora (Robusta); chemometrics quality; rapid methods; infrared spectroscopy; Coffea arabica (Arabica); Coffea canephora (Robusta); chemometrics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Adnan, A.; Hörsten, D.; Pawelzik, E.; Mörlein, D. Rapid Prediction of Moisture Content in Intact Green Coffee Beans Using Near Infrared Spectroscopy. Foods 2017, 6, 38.

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