Portable near infrared spectroscopy applied to quality control of Brazilian coffee

The use of portable micro-spectrometers such as a micro near infrared region (microNIR) spectrometer is a promising technique for solving analytical problems in several areas of science. This work evaluated the potential of microNIR in quality control of Arabica coffee. Arabica coffee has a high com...

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Bibliographic Details
Published in:Talanta (Oxford) 2018-01, Vol.176, p.59-68
Main Authors: Correia, Radigya M., Tosato, Flavia, Domingos, Eloilson, Rodrigues, Rayza R.T., Aquino, Luiz Felipe M., Filgueiras, Paulo R., Lacerda, Valdemar, Romão, Wanderson
Format: Article
Language:English
Subjects:
Adulteration
Coffee
MicroNIR
PCA
PLS
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Summary:The use of portable micro-spectrometers such as a micro near infrared region (microNIR) spectrometer is a promising technique for solving analytical problems in several areas of science. This work evaluated the potential of microNIR in quality control of Arabica coffee. Arabica coffee has a high commercial value product, motivating the development of analytical methods with high sensitivity and accuracy for detection of its adulteration. Herein, microNIR was successfully used to determine the quality of Arabica coffee by identification and quantification of adulterations such as Robusta coffee (in different roasting levels), as well as corn, peels, and sticks. MicroNIR was combined with multivariate calibration by partial least squares (PLS) and principal component analysis (PCA). A total of 125 blends were produced, containing thirteen different concentrations of the adulterants (corn and peels/sticks, and the Robusta coffee) ranging from 1 to 100wt%. Developed PCA and PLS models were also applied to monitor the quality of sixteen commercial coffee samples. The results obtained using microNIR proved the ability of the method to be efficient and capable in the prediction of adulterations with minimum quantification levels (LOQs of 5–8wt%), being able to be applied to quality control of commercial coffee samples. Therefore, microNIR can reduce and simplify the time of analysis and sample preparation step, as well as to guarantee the efficiency of real-time data acquisition owing to its portability. [Display omitted] •A portable microNIR spectrometer was applied in quality control of Arabica coffee.•Adulterations such as Robusta coffee, corn, and peels/sticks were quantified.•MicroNIR was combined with multivariate calibration by PLS and PCA.•A total of 177 blends were produced, containing 13 different concentrations of the adulterants.•The results showed minimum quantification levels (LOQs ranging from 5 to 8wt%).
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2017.08.009