Extractions of pigment from Tuanfeng water chestnut peel by ultrasonic wave

The method using ultrasonic wave assisted water extraction for pigment from Tuanfeng water chestnut peel was adopted.Single factor experiment was employed to find out the factors influence on extraction of pigment,and then orthogonal experiment was carried out to optimize the process conditions.The results showed that the optimum extracting conditions were as follow: 80% vol alcohol as extracting agent,and solid-liquid ratio of 1∶10(g∶mL),ultrasonic power 350W,extracting temperature 55℃ for 25min.Under these conditions,water chestnut skin pigment extract at 490 nm absorbance value was 1.958.