文章基本信息

标题：Rapid Prediction of Moisture Content in Intact Green Coffee Beans Using Near Infrared Spectroscopy
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作者：Adnan Adnan
期刊名称：Foods
电子版ISSN：2304-8158
出版年度：2017
卷号：6
期号：5
页码：38
DOI：10.3390/foods6050038
语种：English
出版社：MDPI Publishing
摘要：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.
关键词：quality; rapid methods; infrared spectroscopy; Coffea arabica (Arabica); Coffea canephora (Robusta); chemometrics quality ; rapid methods ; infrared spectroscopy ; Coffea arabica (Arabica) ; Coffea canephora (Robusta) ; chemometrics