Hot air drying of red beet: Process and product quality monitoring by digital images and near infrared spectroscopy

Author(s)

de Franca, Pedro Renann ; Cruz-Tirado, Jam Pier ; Barbin, Douglas Fernandes ; Kurozawa, Louise Emy

• Document type: Journal article
• Source: Drying Technology; v. N/A, p. 11-pg., 2022-08-30.

Abstract

The use of nondestructive techniques that can guarantee in situ monitoring of the quality of food products during drying processes can promote improvements in industrial processes. In this context, digital imaging and near infrared spectroscopy can play an important role. Red beet moisture content, betalain content, shrinkage, and color were measured during drying. The digital images showed changes in color, which intensified with increasing temperature and correlated with betalain content through multivariate linear regression (R of 0.90). In addition, sample shrinkage was identified by digital images. The volumetric shrinkage increased proportionally to the drying air temperature, with a shrinkage of 85.4 +/- 0.3% at 70 degrees C. Spectral data were obtained by a low-cost portable near infrared spectrometer. Partial least square regression was used to predict the product moisture content (R-p(2) - 0.89: RMSEP - 0.79%) and total betalain content (R-p(2) = 0.79: RMSEP = 0.30mg/gd.b) during drying. These tools can be used for the in situ control of red beet drying. (AU)

• FAPESP's process: 18/02500-4 - Food analyses using NIR spectral imaging
• Grantee: Luis Jam Pier Cruz Tirado
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 19/23032-1 - Study of the relation between the formation of glass transition zones and betalain loss during convective drying of beetroot
• Grantee: Pedro Renann Lopes de França
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 20/09198-1 - Hyperspectral imaging and artificial intelligence for quality control of protein-based products: isolates, microcapsules and gels
• Grantee: Luis Jam Pier Cruz Tirado
• Support Opportunities: Scholarships in Brazil - Doctorate