不同粒度连翘叶粉末的理化性质及抗氧化活性研究

Study on Physicochemical Properties and Antioxidant Activity of Forsythia Leaves with Different Particle Size

摘要: 制备平均粒径分别为60目、150目、250目、450目的连翘叶粉末，研究其理化性质及抗氧化活性。结果表明，随着粉体粒径的减小，粉体的膨胀力、水溶性、持油力、振实密度、持水力明显增加，堆积密度减小；随着时间的增加，四种粒度连翘叶粉末中的黄酮、蛋白质、多糖的溶出量逐渐增大，最高分别达到了25.65 mg/mL、445.3 mg/mL、0.03 mg/mL；在浓度为5 mg/mL、目数为450目时，连翘叶粉末对ABTS自由基的清除率为67.6%、对DPPH自由基的清除率为81.3%以及对羟自由基的清除率为71.5%，并且还原力达到1.72。本研究可为连翘叶资源的充分开发利用提供一定的参考。

Abstract: Prepare Forsythia leaf powders with average particle sizes of 60 mesh, 150 mesh, 250 mesh, and 450 mesh, respectively, to study their physicochemical properties and antioxidant activity. The results indicate that as the particle size of the powder decreases, the swelling power, water solubility, oil-holding capacity, tap density, and water-holding capacity significantly increase, while the bulk density decreases. Over time, the dissolution amounts of flavonoids, proteins, and polysaccharides in the four particle sizes of Forsythia leaf powders gradually increase, reaching maximum values of 25.65 mg/mL, 445.3 mg/mL, and 0.03 mg/mL, respectively. At a concentration of 5 mg/mL and a mesh size of 450, the Forsythia leaf powder exhibits scavenging rates of 67.6% for ABTS radicals, 81.3% for DPPH radicals, and 71.5% for hydroxyl radicals, with a reducing power of 1.72. This study can provide a reference for the full development and utilization of Forsythia leaf resources.