Topical Area: Nutrition Translation
Objectives : The purpose of this study was to investigate optimization of spray drying conditions for water-soluble powder using response surface methodology that is a statistical procedure used for optimization studies.
Methods : First, conditions of the extract used for spray drying were set. We compared heat water extraction(60-100℃) with ethanol extraction(10-50%). After final selection of the method of extract used for spray drying, spray drying conditions were set. Independent variables included the additive contents of maltodextrin(X1), inlet temperature(X2), and air flow rate(X3). The dependent variables were yield, water absorption index(WAI) and total phenolic compounds.
Results : The yield was highest in 100℃ heat water extraction. The content of rutin was 29.77 mg / 100 g in 90 ℃ heat water extraction, 28.07 mg / 100 g in 100 ℃ heat water extraction and 24.24 mg / 100 g in 10% ethanol extraction. The heat water extraction method at 100 ℃ was selected as an extract of the spray dryer. Statistical analysis revealed that independent variables significantly affected all the responses. A maximum yield was obtained at 15.55% of X1, 167.87 ℃ of X2 and 50.00 mL/min of X3. The water absorption index of asparagus increased with increasing MD ratio (X1), higher inlet temperature (X2) and higher air flow rate (X3). The total polyphenol contents of asparagus were higher when the MD addition ratio (X1) was 16.56%, the inlet temperature (X2) was higher and the air flow rate (X3) was higher.
Funding Sources : This study was supported by 2018 Regional Specialized Technology Development Project, Rural Development Administration, Republic of Korea.