Journal
POSTHARVEST BIOLOGY AND TECHNOLOGY
Volume 181, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.postharvbio.2021.111640
Keywords
Durian pulp; Physicochemical properties; In-line; Vis-SWNIR; Partial least squares regression
Categories
Funding
- King Mongkut's Institute of Technology Ladkrabang research fund [A118-01162-006]
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The study focused on predicting the dry matter content (DMC) and soluble solids content (SSC) in durian pulp using a small laboratory scale spectroscopic system. The optimal scanning position was found to be the center of the pulp in the upright position. The final model showed high accuracy in predicting DMC and SSC values.
The prediction of dry matter content (DMC) and soluble solids content (SSC) in durian pulp were performed using a small laboratory scale in-line visible and short wave near infrared (Vis-SWNIR) spectroscopic system. The fiber optic diode array spectrometer with a charged coupled device (CCD) detector in a wavelength range of 450-1000 nm was used for spectral data acquisition. The spectra of the sample were acquired on the moving conveyor belt in two different orientations, including scanning in the upright position of pulps collected in 2018 and the stable position by scanning on the side of the pulps collected in 2019. Partial least squares regression (PLSR) was used to establish the relationship between the spectra and observed DMC and SSC values using the different wavelength ranges, including 450-1000, 700-1000, and 800-1000 nm for the comparison. The results showed that the durian pulp should be scanned in the upright position at the center of the pulp. Moving average smoothing preprocessing combined with the standard normal variate (SNV) for DMC and multiple scatter correction (MSC) for SSC gave the best result. The suitable wavelength range for model development to predict the DMC and SSC was 700-1000 nm and 800-1000 nm, respectively. After comparing the results, the optimum model showed the coefficient of determination of calibration (R-C(2)), and prediction (R-P(2)), root mean square error of prediction (RMSEP), bias, and the ratio of performance to interquartile distance (RPIQ) of 0.88, 0.83, 4.32 %, 1.25 %, and 3.52 for DMC and 0.70, 0.70, 4.0 %, 0.4 %, and 2.2 for SSC prediction.
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