Physical Changes in Bamboo (Bambusa phyllostachys) Shoot During Hot Air Drying: Shrinkage, Density, and Porosity

Autor:	Ponciano S. Madamba
Rok vydání:	2003
Předmět:	Bamboo Materials science biology General Chemical Engineering Bambusa biology.organism_classification Bamboo shoot Phyllostachys Horticulture Relative humidity Physical and Theoretical Chemistry Particle density Water content Shrinkage
Zdroj:	Drying Technology. 21:555-568
ISSN:	1532-2300 0737-3937
DOI:	10.1081/drt-120018462
Popis:	The apparent density of bamboo (Bambusa phyllostachys) shoot was investigated at a moisture content range of 10–92% wet basis by weighing the product in air and determining the buoyancy force in toluene. An analysis of variance (ANOVA) unveiled that moisture content significantly affected apparent density at 95% confidence level. The true density of the bamboo shoot was determined by grinding the dried sample to exclude all internal pores and using density bottles. The experimental data fitted well to a general density equation for fruits and vegetables proposed by Lozano et al. (1983) and to a second order polynomial (SOP) model. The internal porosity generated during drying varied in a nonlinear (quadratic) fashion. Shrinkage at different moisture content levels was measured by evaluating the dimensional changes in bamboo shoot slabs (5.0 × 3.2 × 1.8 cm) by drying in a convection oven and a tray dryer operating at 70°C and 7.2% relative humidity. Shrinkage was affected statistically by decreasi...
Databáze:	OpenAIRE
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