Influence of parameters of drying on laser induced diffuse reflectance of banana discs

Dénes, Lajos Dénes, Parrag, Viktória, Felföldi, József and Baranyai, László (2013) Influence of parameters of drying on laser induced diffuse reflectance of banana discs. Journal of Food Physics, 26 (1). pp. 11-16.

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Banana discs of 1 cm thickness were immersed into different antioxidant solutions to slow down potentially disturbing discoloration during drying. Samples were randomly split into 8 groups according to the 2^p experimental design. Two antioxidant solutions with 1.66% and 4.59% ascorbic acid, two levels of drying temperature with 50°C and 80°C, two levels of drying time with 6h and 8h were used or adjusted. Laser diodes of seven wavelengths (532, 635, 650, 780, 808, 850 and 1064 nm) were selected to illuminate the surface and light penetration pattern was evaluated on the basis of radial profiles. Profiles acquired at three wavelengths (532, 635 and 650 nm) were found to respond sensitively to adjusted parameters. As a result of drying, intensity decay was observed to move closer to incident point. Significant effect (p<0.01) of temperature, drying time and their interaction was found on extracted descriptive attributes of intensity profiles: full width at half maximum (FWHM), distance of inflection point (DIP) and slope of logarithmic decay (SLD). Beyond their presence, antioxidant concentration was neutral factor without significant contribution to the model. Results were in agreement with reference spectroscopic measurements, especially with NDVI index. Promising results suggest that evaluated method might be suitable for monitoring purposes during drying of fruits.

Item Type:Article
Uncontrolled Keywords:machine vision, digital image processing, laser backscattering, banana drying
Divisions:Faculty of Food Science > Department of Physics and Control
Subjects:Food science
Food safety and quality
Méréstechnika, fizikai jellemzők
ID Code:1517
Deposited By: Dr. László Baranyai
Deposited On:03 Apr 2014 17:52
Last Modified:03 Apr 2014 17:52

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