Application Of Peleg Model On Hydrothermal Treatment Of Tiger Nut Tubers (Cyperus Esculentus) And Effect Of Dehulling Efficiency On Microbial Load
Résumé
The present work was carried out with the aim to establish the influence of hydrothermal treatments on physical and microbiological characteristics and Peleg's prediction of soaking behavior of tiger nut tubers. For this purpose, tigernut tubers (Cyperus esculentus) Ø≥1cm, were differently soaked in tree solutions: acid solution (vitamin C) and alkaline solutions (Ca(OH)2 and Kanwa) at different concentrations and temperatures. The effect of these treatments on the water content (swelling), soluble loss, dehulling efficiency and microbial load were investigated. These works show that, water content or swelling of the tiger nut soaked in acid and alkaline solutions can be predicted by Peleg model. This swelling lead to enhance dehulling efficiency of tuber but caused soluble solute loss overall at the highest temperature of soaking in vitamin C solution. Like soaking in water, the constant of Peleg (k1) decrease with the increase in the temperature of soaking, whereas the constant of capacity of Peleg (k2) is approximately 0.02% for all the conditions of soaking. Dehulling efficiency also increased with increasing temperatures (65% at 20°C to 70% at 60°C) for tiger nut tubers soaked in water and affects microbial load. This reduction is considerable at the higher temperatures, reaching a maximum of 4.8log reduction. Soaking and dehulling treatments gave to tiger nut tuber effective decontamination in term of microbial load and obtained good microbiological quality.
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