Poorly emphasized aspects for a sustainable olive oil system are chemical analysis replacement and quality design of the final product. In this context, near infrared spectroscopy (NIRS) can play a pivotal role. Thus, this study aims at comparing performances of different NIRS systems for the prediction of moisture, oil content, soluble solids, total phenolic content, and antioxidant activity of intact olive drupes. The results obtained by a Fourier transform (FT)-NIR spectrometer, equipped with both an integrating sphere and a fiber optic probe, and a Vis/NIR handheld device are discussed. Almost all the partial least squares regression models were encouraging in predicting the quality parameters (0.64 < R2pred < 0.84), with small and comparable biases (p > 0.05). The pair-wise comparison between the standard deviations demonstrated that the FT-NIR models were always similar except for moisture (p < 0.05), whereas a slightly lower performance of the Vis/NIR models was assessed. Summarizing, while on-line or in-line applications of the FT-NIR optical probe should be promoted in oil mills in order to quickly classify the drupes for a better quality design of the olive oil, the portable and cheaper Vis/NIR device could be useful for preliminary quality evaluation of olive drupes directly in the field.

Near Infrared Spectroscopy as a Green Technology for the Quality Prediction of Intact Olives / S. Grassi, O.S. Jolayemi, V. Giovenzana, A. Tugnolo, G. Squeo, P. Conte, A. De Bruno, F. Flamminii, E. Casiraghi, C. Alamprese. - In: FOODS. - ISSN 2304-8158. - 10:5(2021 May 11). [10.3390/foods10051042]

Near Infrared Spectroscopy as a Green Technology for the Quality Prediction of Intact Olives

S. Grassi
Primo
;
O.S. Jolayemi
Secondo
;
V. Giovenzana;A. Tugnolo;E. Casiraghi
Penultimo
;
C. Alamprese
Ultimo
2021-05-11

Abstract

Poorly emphasized aspects for a sustainable olive oil system are chemical analysis replacement and quality design of the final product. In this context, near infrared spectroscopy (NIRS) can play a pivotal role. Thus, this study aims at comparing performances of different NIRS systems for the prediction of moisture, oil content, soluble solids, total phenolic content, and antioxidant activity of intact olive drupes. The results obtained by a Fourier transform (FT)-NIR spectrometer, equipped with both an integrating sphere and a fiber optic probe, and a Vis/NIR handheld device are discussed. Almost all the partial least squares regression models were encouraging in predicting the quality parameters (0.64 < R2pred < 0.84), with small and comparable biases (p > 0.05). The pair-wise comparison between the standard deviations demonstrated that the FT-NIR models were always similar except for moisture (p < 0.05), whereas a slightly lower performance of the Vis/NIR models was assessed. Summarizing, while on-line or in-line applications of the FT-NIR optical probe should be promoted in oil mills in order to quickly classify the drupes for a better quality design of the olive oil, the portable and cheaper Vis/NIR device could be useful for preliminary quality evaluation of olive drupes directly in the field.
antioxidant activity; harvesting time; olive composition; olive cultivars; olive ripening; phenolic compounds; PLS regression model; portable device; quality parameters; sustainability;
Settore AGR/15 - Scienze e Tecnologie Alimentari
Settore AGR/09 - Meccanica Agraria
Article (author)
File in questo prodotto:
File Dimensione Formato  
2021-Foods_olive_regression.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 861.06 kB
Formato Adobe PDF
861.06 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/843695
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 3
social impact