Study on the technical parameters and quality of desulfurization in sulfited Shuanghua Plum by citric acid solution

With the sulfited Shuanghua Plum being used as material,the desulfurization by citric acid solution was studied by evaluating the desulfurization rate and quality of fruit embryo( including color,texture) and the technical parameters were determined.Results showed that citric acid concentration,temperature,water bath time all had a great effect on the rate of desulfurization.Within a certain range,higher citric acid concentration and desulfurization temperature could significantly improve the desulfurization effection,but higher temperature and longer time could make peel damaged and its pulp softer.The optimal parameters of the orthogonal design for desulfurization were:4% of citric acid concentration,90 ℃ of desulfurization temperature,20 min of water bath time. In this optimal condition,the SO2 removal rate of fruit embryo the reaches to 88.59% and the fruit embryo still maintain a good appearance and texture.