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    THE EFFECT OF SWEET POTATO PEEL HYDROLYSIS METHODS ON THE PRODUCTION OF BUTYRIC ACID AND BUTANOL USING CLOSTRIDIUM ACETOBUTYLICUM
    (2023-01-01)
    Chiraporn, Pingmuang
    ;
    Jurarat, Jumangmor
    ;
    Doungkaew, Phiromphong
    ;
    Noppol, Leksawasdi
    ;
    Vorapat, Sanguanchaipaiwong
    Sweet potato (Ipomoea batatas L.) is a widely cultivated crop worldwide, yielding approximately 89.5 million tons annually. While sweet potatoes are consumed for various food purposes, there is a substantial amount of peel waste generated. Due to its high starch content, sweet potato peel has garnered interest as a potential feedstock for bioenergy conversion, particularly in bioalcohol production. However, this study reveals that the choice of hydrolysis method, either acidic or enzymatic, can significantly impact the products synthesized by Clostridium acetobutylicum. To conduct the experiments, sweet potato peel was milled into a powder and subjected to hydrolysis using 5% (v/v) H2SO4 at 90°C for 2 hours, or with 0.05% α-amylase (Termamyl<sup>®</sup>) at the same temperature for 2 hours, followed by 0.015% glucoamylase (AMG<sup>®</sup>) at 60°C for 4 hours. Each resulting hydrolysate, containing a reducing sugar concentration equivalent to 20 g/L, was then incorporated into a Glucose-Yeast extract-Casein-Cysteine (GYCC) medium for C. acetobutylicum cultivation. It was observed that the hydrolysis method employed significantly influenced various aspects of C. acetobutylicum growth, production time, and butyrate-to-butanol conversion. Notably, it is important to highlight that there was no significant difference (p>0.05) in the butanol concentration between the acidic hydrolysate (1.13 g/L) and the enzymatic hydrolysate (1.20 g/L). These findings emphasize the critical role of the hydrolysis method in determining the performance of C. acetobutylicum in terms of butanol production, growth, and conversion rates.
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    IMPACT OF DRYING TEMPERATURES ON DRYING BEHAVIOURS, ENERGY CONSUMPTION AND QUALITY OF PURPLE SWEET POTATO FLOUR
    (2022-01-01)
    Thuy, Nguyen Minh
    ;
    Hiep, Le Huy
    ;
    Tai, Ngo Van
    ;
    Huong, Huynh Thi Thu
    ;
    Minh, Vo Quang
    to purple sweet potatoes could enhance the economic value of this material. Furthermore, energy consumption, as well as the change in the quality of the product, are the important characteristics that determine the product’s quality and effect on the environment. Material and methods. This research examined the impact of various drying temperatures on kinetic behaviour, effective moisture diffusivity coefficient (D<inf>eff</inf>), activation energy (E<inf>a</inf>), specific energy consumption (SEC), color, shrinkage and physicochemical characteristics of purple sweet potatoes. The final quality of the sample was also evaluated. Results. Seven models were applied and fitted to actual data of the drying process. The two-term model showed the best fit with high R<sup>2</sup>, and low RMSE and Chi-square. The calculated D<inf>eff</inf> and Ea values were 1.58– 2.67 m2/s and 17.95 kJ/mol, respectively. The energy consumption of drying purple sweet potatoes ranged from 107.92 to 119.01 kWh/kg. The quality of the product was maintained when a sample was dried at 60°C. Conclusion. Temperature strongly affected the quality of dried purple sweet potatoes and energy consumption. The first report about the value of energy used during the drying process of sweet potatoes also provides more information about the effect of the drying process on carbon emissions to the environment. Therefore, research aimed at improving product quality and minimizing environmental impacts should be implemented in the future and concerned with ensuring sustainable agricultural production.