Changes of Physico-chemical Properties of Sequential Minimal Ozonetreated Ice-stored Pacific white shrimp (Litopenaeus vannamei)
Charles Odilichukwu R. Okpala.
In this study, changes of some physico-chemical properties of ice-stored Pacific white shrimp (Litopenaeus
vannamei) subjected to sequential minimal ozone treatment of 11 days were investigated. The physico-chemical properties
studied included proximal composition (fat, protein, moisture, ash), water activity (aw), water retention index (WRI),
pH, thiobarbituric acid reactive substances (TBARS), colour (L* a* b* and whiteness colour values), total carbohydrate
(TC), total energy (TE), hardness and adhesiveness. The results indicated that the fat, protein, aw, WRI, pH, TBARS and
colour of sequential minimal ozone-treated ice-stored shrimp were significantly affected with storage (P < 0.05). As
TBARS of both groups of shrimp steadily increased throughout storage of 11 days, the TBARS of sequential minimal
ozone-treated remained lower compared to control (P < 0.05). The colour (L*, a*, b* and whiteness) of sequential minimal
ozone-treated showed significant differences compared to control (P < 0.05). However, differences in TC, TE, hardness
and adhesiveness between sequential minimal ozone-treated and untreated ice-stored shrimp were not statistically
significant (P > 0.05). For the first time, the effect of sequential minimal ozone treatment on some physico-chemical
properties of ice-stored Pacific white shrimp is hereby reported.
Keywords: Litopenaeus vannamei, sequential minimal ozone treatment, proximate analysis, water activity, water retention
index, pH, lipid oxidation, colour, total carbohydrate, total energy, texture, iced storage.
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