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Use of visible and near infrared spectroscopy with a view to on-line evaluation of oil content during olive processing
- Source :
- Biosystems Engineering. 172:102-109
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The aim of this preliminary feasibility study was to verify whether visible/near infrared(vis/NIR) spectroscopy could be used to predict the oil content of intact olives entering the mill, and of olive paste, pomace and pate during the milling process. Three different extraction methods (3-phase decanters, 2-phase decanters and 2.5-phase decanters) were considered, and two optical devices were tested: (i) a process device for non-contact analysis and (ii) a system equipped with an immersion probe for contact measurements, both working in the spectral range 400–1650 nm. 35 samples of olives were collected during the experimental tests, 50 samples of olive paste, 50 samples of pomace and 50 samples of pate. The collected samples (olives, olive paste, pomace and pate) were used to calculate partial least squares (PLS) regression models. Results regarding the non-contact analyses were encouraging, except for the measures on olives. On pomace, satisfactory models were calculated for the vis/NIR range [Ratio Performance Deviation (RPD) > 2], and a good model with R2 = 0.81 and RPD = 2.68 in validation was calibrated in the NIR range. The device equipped with an immersion probe achieved good predictive models for the oil content prediction on pate (R2 and RPD values ranged 0.77–0.82 and 3.00–3.43). The predictive models could be easily applied in an on-line system to monitoring the entire extraction plant and to perform a feed-forward control, allowing a reduction of oil leakage to minimise the oil losses and to maximise the extraction yield.
- Subjects :
- Materials science
010401 analytical chemistry
Near-infrared spectroscopy
Extraction (chemistry)
Pomace
Soil Science
Visible and near infrared spectroscopy
Infrared spectroscopy
04 agricultural and veterinary sciences
Pulp and paper industry
040401 food science
01 natural sciences
0104 chemical sciences
0404 agricultural biotechnology
Control and Systems Engineering
Oil content
Partial least squares regression
Extraction methods
Agronomy and Crop Science
Food Science
Subjects
Details
- ISSN :
- 15375110
- Volume :
- 172
- Database :
- OpenAIRE
- Journal :
- Biosystems Engineering
- Accession number :
- edsair.doi...........3093bdf05ce8608277aa4cb0e6660228