MICROENCAPSULATION OF CHESTNUT SEEDCOAT’S WATER EXTRACT BY SPRAY DRYING

Abstract

Chestnut seedcoats were extracted per the extraction conditions defined by Central Composite Design which was considering extraction temperature 65-95°C and time 15-90 min . Total phenolic content TPC of the extracts was used as response to determine optimum extraction condition s , estimated as 95C for 65 min with the maximum TPC of 357.7 mg/g. The BoxBehnken response surface methodology was used to optimize the processing of spray drying. Maltodextrin MD and Arabic Gum AG were used as wall material for spray drying process. The independent variables used were the wall material ratio 5-20 % , MD:AG ratio and the inlet temperature 150-180 °C whereas the responses were the product yield PY and the TPC of the microcapsules. The optimum spray drying conditions, simultaneously maximized the PY 69.62% and TPC 272.52 mg/g , were determined as the wall material ratio of 12.5%, MD:AG ratio of 75:25 and the inlet temperature of 164C. The microcapsules, produced at optimum conditions, were also analyzed for their moisture content 3.2% , water activity 0.255 , bulk density 0.32 g/cm , color Hunter L=59.19, a=11.27, b=22.94 , hygroscopicity 11.02% , solubility 79.83% , particle size 6.52 µm , total antioxidant activity 0.456 g/mg DPPH and total flavonoid content 39.75 g/mg DPPH

Keywords

• Chestnut seedcoat,spray drying,microencapsulation,total phenolic content,total antioxidant activity

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