Effect of Alternative Solutes and Ultrasound on Mass Transfer of Thong Rayong Pineapple in Dry Infusion Process
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Abstract
Dry infusion was carried out by adding sugar directly to the fruit pieces and allowing them to contact together. It was effective for removing of water from the fruit. The purpose of this research was to study the effect of using different types of alternative solutes, namely oligofructose, maltodextrin and sorbitol instead of sucrose. Mass transfer of Thong Rayong pineapple during dry infusion process showed that the solute types affect the mass transfer parameters. The use of sorbitol had the highest mass transfer value (p<0.05). Effect of ultrasound assisted mass transfer was studied. The result showed that ultrasound applied at 50±2 °C for 15 min was the optimum condition which enhanced Water Loss (WL), Solid Gain (SG) and Weight Reduction (WR) values of 37.08%, 6.58%, and 30.49%, respectively. Sensory scores in terms of appearance, color, texture, and overall preference of semi-dried pineapple from infusion process were more than semi-dried pineapple without dry infusion (p<0.05), with a moderate overall liking score.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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