Optimization technology of alkali processing of Eucheuma carrageenan by response surface methodology

We studied he influence of3 factors including alkali concentration, soaking time and temperature on gel strength ( GS ) and yield of Eucheuma carrgeenan by response surface methodology (RSM ) . On the basis of single-factor investigation, Box-Benhnken central composite experiments were carried out to build the quadratic regression models for GS and yield with the above 3 factors, and the alkali processing technology was optimized by response surface analysis. The optimizing process parameters are: alkali concentration 250 gL-1, soaking time 3.5 d, soaking temperature 25 ℃. Under the optimal processing condition, the GS and yield of carrgeenan were 721 gcm-2 (under concentration of 10 gL-1) and 35.17%, respectively.