FT-NIR spectroscopy as a tool for valorization of spent coffee grounds: Application to assessment of antioxidant properties

Páscoa, Ricardo N.M.J.; Magalhães, Luís M.; Lopes, João A.

doi:10.1016/j.foodres.2013.01.035

Cited by 61 publications

(34 citation statements)

References 38 publications

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“…According to obtained results, it can be seen that the spectra of samples are overlapped. Concerning the applied NIR spectra region, the spectrum is divided into regions that cover those combinations and overtones due to present phenolic compounds, therefore, the right way would be the regions that cover the O-H combinations and overtones (Pascoa, Magalhaes, & Lopes, 2013).…”

Section: Nir Spectra Informationmentioning

confidence: 99%

“…Models that have used row NIR absorbance spectra were not so efficient in predicting (R 2 P < 0.5; results not presented), so instead of the NIR absorbance spectra was used the set of spectra presenting first derivative of it and the partial least squares (PLS) used in prediction of the content of phenolic compounds is modeled from NIR spectra first derivate (using the regions that have proven to be significant: 1095-1256; 1347-1392 and 1591-1678 nm). The optional number of latent variables was estimated using the random subset cross-validation method (Pascoa et al, 2013;Sarraguca & Lopes, 2009) followed by the calibration of the models with the calibration set using the estimated number of latent variables. The independent set is then projected onto these models yielding the prediction set results.…”

Section: Calibration and Prediction Capacity Of The Nir Calibration Mmentioning

confidence: 99%

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Gas phase plasma impact on phenolic compounds in pomegranate juice

et al. 2016

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Section: Nir Spectra Informationmentioning

confidence: 99%

Section: Calibration and Prediction Capacity Of The Nir Calibration Mmentioning

confidence: 99%

Gas phase plasma impact on phenolic compounds in pomegranate juice

et al. 2016

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“…Several studies have determined polyphenols in different foods with different methods, as spectroscopy (Fudge et al 2013;Pascoa et al 2013), electronic nose and tongue (Rudnitskaya et al 2010), high-performance liquid chromatography (Panzella et al 2013;Tuberoso et al 2013) or capillary electrophoresis (Bayram et al 2013;Dias et al 2013a). However, to our knowledge, the differences between wines of different DOs have not been evaluated using the polyphenolic profile for authentication purposes.…”

Section: Introductionmentioning

confidence: 99%

Polyphenolic Profile of Red Wines for the Discrimination of Controlled Designation of Origin

Martelo-Vidal

Vázquez

2015

Food Anal. Methods

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The aims were to determine the polyphenolic profile of red wines from Spanish Designation of Origin (DO) Rías Baixas and Ribeira Sacra and to evaluate the feasibility of using polyphenolic profiles and chemometric tools to classify wines for authentication purposes. Trans-resveratrol, oenin, malvin, (+)-catechin, (−)-epicatechin, quercetin and syringic acid were determined in 39 samples. Soft independent modeling of class analogy (SIMCA), linear discriminant analysis (LDA) and support vector machine classification (SVM) were used to classify. For resveratrol, Ribeira Sacra red wines showed higher values than Rías Baixas wines (4.60 and 3.36 mg L −1 , respectively). SVM classification was adequate for 100 % classification of wines by their polyphenolic profile. SIMCA classification was also adequate for wine classification of DO Rías Baixas and Ribeira Sacra wines. As conclusion, polyphenolic profile can be used for classification of DOs. The models can discriminate outside wines. Thus, this approach can be useful for authentication purposes.

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“…FOMs such as sensitivity (SEN), selectivity (SEL), and LOD can be estimated and used to compare methods or to study the quality of a technique. In this work, these FOMs were calculated using the equations given in Marsili et al (2003) and Pascoa et al (2013).…”

Section: Multivariate Data Analysismentioning

confidence: 99%

“…Sensitivity is the NAS vector generated by an analyte of unit concentration and is the slope of the calibration curve. It measures the change in values as a function of the concentration of a particular analyte; thus, the estimation of sensitivity can be used to compare the performance of different models developed for the same analyte (Pascoa et al, 2013). In our case, both NAS-PCR and NAS-PLSR developed with whole variables have similar sensitivities but NAS-PCR developed with SRselected variables has a better sensitivity.…”

Section: B)mentioning

confidence: 99%

Net Analyte Signal-based Quantitative Determination of Fusel Oil in Korean Alcoholic Beverage Using FT-NIR Spectroscopy

Lohumi¹,

Kandpal²,

Seo³

et al. 2016

Journal of Biosystems Engineering

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Purpose: Fusel oil is a potent volatile aroma compound found in many alcoholic beverages. At low concentrations, it makes an essential contribution to the flavor and aroma of fermented alcoholic beverages, while at high concentrations, it induced an off-flavor and is thought to cause undesirable side effects. In this work, we introduce Fourier transform near-infrared (FT-NIR) spectroscopy as a rapid and nondestructive technique for the quantitative determination of fusel oil in the Korean alcoholic beverage "soju". Methods: FT-NIR transmittance spectra in the 1000-2500 nm region were collected for 120 soju samples with fusel oil concentrations ranging from 0 to 1400 ppm. The calibration and validation data sets were designed using data from 75 and 45 samples, respectively. The net analyte signal (NAS) was used as a preprocessing method before the application of the partial least-square regression (PLSR) and principal component regression (PCR) methods for predicting fusel oil concentration. A novel variable selection method was adopted to determine the most informative spectral variables to minimize the effect of nonmodeled interferences. Finally, the efficiency of the developed technique was evaluated with two different validation sets. The experimental results indicate that the proposed technique could be an alternative to conventional methods for the quantitative determination of fusel oil in alcoholic beverages and has the potential for use in in-line process control.

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FT-NIR spectroscopy as a tool for valorization of spent coffee grounds: Application to assessment of antioxidant properties

Cited by 61 publications

References 38 publications

Gas phase plasma impact on phenolic compounds in pomegranate juice

Gas phase plasma impact on phenolic compounds in pomegranate juice

Polyphenolic Profile of Red Wines for the Discrimination of Controlled Designation of Origin

Net Analyte Signal-based Quantitative Determination of Fusel Oil in Korean Alcoholic Beverage Using FT-NIR Spectroscopy

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