OPTIMIZATION OF SPRAY DRYING CONDITIONS OF NELUMBO NUCIFERA LEAVES EXTRACT USING RESPONSE SURFACE METHODOLOGY

Tóm tắt

The purpose of the present work is to study the effect of inlet drying temperature (140-170^oC), feed flow rate (20-30ml/min) and maltodextrin ratio (10-20%) on the total phenolic content (TPC) and total flavonoid content (TFC) of spray-dryed Nelumbo nucifera extracts using response surface method/technique (RSM). The optimal conditions for spray drying process from leaves of N. nucifera extracts were found to be inlet drying temperature of 141^oC, feed flow rate of 30ml/min and maltodextrin ratio of 10%w/v. The experimental values of TPC and TFC were 36.89±0.05mg GAE/g and 9.22±0.02 mgCE/g.