Optimization of the spray drying performance of banaba [Lagerstromia Speciosa (L.) Pers.] leaf extract for instant tea
2011
Tanquilut, M.R.C. | Tanquilut, N.C., Pampanga Agricultural Coll., Magalang, Pampanga (Philippines) | Elauria, J.C., Philippines Univ. Los Baños, College, Laguna (Philippines). Coll. of Engineering and Agro-industrial Technology
The study was conducted to establish the optimum spray drying performance of banaba leaf extract for instant tea and develop a drying model for it using the Regression Surface Methodology. The effect of the process parameters such as air inlet temperature (100, 120 and 140 deg C), pump speed (7000, 10,000 and 13,000 rpm) and decoction ratio (1:3, 1:5 and 1:7, banaba leaf to water) on the response variables, namely: drying capacity, product moisture content and recovery rate, were evaluated. The experimental test consisted of fifteen (15) runs using the Box-Behnken design. Response surface analysis showed that models for drying capacity and moisture content were statistically adequate. The optimal processing condition is 122 deg C, 10,000 rpm and 17.5 (1:5:7, banaba leaf to water) decoction ratio yielding to a drying capacity of 15.16 g/min and 6.84% moisture content, dry basis. Upon validation, it was found that the predictive model for the drying capacity is accurate and precise and better product moisture content was obtained. Moreover, the spray dried banaba powder shown significant anti-diabetic activity when tested on alloxan-induced diabetic mice at the dosage rate of 250 mg/100g body weight. Hence, spray drying can be used in the production of banaba powder at specified optimum condition.
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