Determination of 'Palmer' mango maturity indices using portable near infrared (VIS-NIR) spectrometer

Author(s)

dos Santos Neto, Joao Paixao ; Dantas de Assis, Mateus Wagner ; Casagrande, Izabella Parkutz ; Cunha Junior, Luis Carlos ; de Almeida Teixeira, Gustavo Henrique

• Document type: Journal article
• Source: Postharvest Biology and Technology; v. 130, p. 6-pg., 2017-08-01.

Abstract

'Palmer' mango cultivar is a late season variety which is greatly accepted by European consumers. However, it is common to get reports of fruit quality problems, mainly due to maturity. Thus, the objective of this study was to develop calibration models for soluble solids content (SSC) and dry matter (DM) of 'Palmer' mangoes using portable (VIS-NIR) spectrometer. Interactance spectra were obtained with a portable F-750 spectrometer in the wavelength range of 306-1140 ma, 8 nm spectrum resolution, and 4 scans averaged per spectra. Spectra were used to develop SSC and DM models using partial least square regression (PLSR) with full cross validation. The best SSC calibration model was developed using spectra pre-processed with standard normal variate (SNV), first derivative of Savitzky-Golay and window of 699-999 nm. It was observed a RMSEcv of 1.39%, with a R-cv(2) of 0.87, and RPD of 2.77. Better results were observed for the DM calibration model which was built with raw spectra using the window of 699-981 nm (RMSEcv of 8.81 g kg(-1), R-cv(2) of 0.84, and RPD of 2.51). Poor calibration models were obtained for firmness. The results indicated that portable VIS-NrR. spectrometer can be used as a non-destructive technique to assess SSC and DM content for 'Palmer' mangoes. It is necessary to incorporate more sources of variation, to reduce RMSE values and improve robustness, especially for fruit SSC and DM prediction. (AU)

• FAPESP's process: 15/03451-9 - MANGOEXPORT - improving mango quality in export supply chains
• Grantee: Gustavo Henrique de Almeida Teixeira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/25631-9 - Optimization of controlled atmosphere storage conditions to export 'Palmer' mango
• Grantee: João Paixão dos Santos Neto
• Support Opportunities: Scholarships in Brazil - Doctorate