Studies on Thermal, Textural and Quality Parameters
of Multiplier CO 4 Onion Bulb (Allium cepa L.var
aggregatum Don.)
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Author:G. Kaveri and V. Thirupathi
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:101, Issue:oct-dec
DOI: https://doi.org/10.29321/MAJ.10.001226
Abstract
Thermal properties are essential for predicting the temperature distribution within the foods
and to allow optimum design of heat transfer equipment. Study of thermal, textural properties
and quality parameters are necessary to understand the behavior of onion during storage
and consumption. All these properties were measured and a data base for the CO 4 variety
was formed. Thermal properties of the fresh and three months stored onion bulbs were
estimated. The specific heat, thermal conductivity and volumetric heat capacity were linearly
related and also the thermal diffusivity indirectly related with moisture content of the fresh
and three months stored onion. Penetration load and crushing load of fresh and stored onion
bulbs were determined. The mean values of total soluble solids (TSS), colour parameter ‘a’
and pyruvic acid content were 16.91±0.90 to 17.29 ± 0.62 per cent, 15.23 ± 10 to 14.58±0.67 and
4.58±0.41 and 4.25±0.39 μmol/g respectively, for the fresh and three months stored onion.
All the properties were assessed at an average moisture content of 83.45±1.10 per cent (wb)
for the fresh onion bulbs and 81.82±1.01 per cent (wb) for the three months stored onion CO
4 variety.
Key words : Specific heat, Thermal conductivity, Thermal diffusivity, Volumetric heat capacity,
Penetration load and Colour.