摘要：本實驗采取超聲水提取法和超聲結合酶法研究了紅薯渣中可溶性膳食纖維提取的工藝條件，并對其功能進行探討。實驗結果表明：超聲水提取最佳工藝條件為料液比1:30，超聲時間25min，超聲功率150W，紅薯渣中可溶性膳食纖維的提取率為5.64%；超聲結合酶法提取最佳工藝條件為加酶量為1.5%，料液比1:30，時間20min，功率100W，紅薯渣中可溶性膳食纖維的提取率為7.29%。紅薯渣中可溶性膳食纖維對OH和O2-自由基都具有較強的清除能力，其50%清除率對應的紅薯渣中可溶性膳食纖維（SDF）的濃度（IC50）分別為3.94mg/mL、0.35mg/mL；紅薯渣中可溶性膳食纖維對DPPH有一定的清除作用，清除率可達40%以上。紅薯渣中可溶性膳食纖維的持水力為356%，膨脹力為13.26mL/g。

關鍵詞 紅薯渣；可溶性膳食纖維；超聲；酸性纖維素酶；功能性

Abstract： In this experiment, technological conditions for extraction of soluble dietary fiber in sweet potato residue with ultrasound water extraction and ultrasoud combined with enzymatic were researched and its funtions were studied.The test results showed that the optimal condition of ultrasound water extraction were material to liquid ratio 1:30, ultrasonic time 25 min, ultrasonic power 150w, the extraction rate of soluble dietary fiber in sweet potato residue was 5.64%; the optional condition of ultrasound combined with enzyme extraction were enzyme volume 1.5%, material to liquid ratio 1:30, ultrasonic time 20 min, ultrasonic power 100w, the extraction rate of soluble dietary fiber in sweet potato residue was 7.29%. The soluble dietary fiber of sweet potato residue has a high scavenging activity onOH andO2- free radical, the IC50 of soluble dietary fiber was 3.94mg/mL,0.35mg/mL respectively; the soluble dietary fiber has certain scavenging action to DPPH, the percentage clearance can reach 40%. The expansion capacity and water holding capacity of soluble dietary fiber in ginger were 356% and 13.26mL/g respectively. 

Keywords  Sweet Potato Residue  Soluble Dietary Fiber  Ultrasound  Acidic Cellulase  Function