Pectin, a biopolymer was extracted from the peels of orange. In extraction of the pectin from orange peel, acid hydrolysis of the dry orange fruit peel was carried out and continued precipitation using ethanol. The percentage yield of the extracted pectin is 12.25%. Equivalent weight, degree of esterification, methoxy content, AUA% and molecular weight for pectin were determined. Further by co-precipitation method the citrus pectin-MgO nanocomposite was prepared. Extracted pectin and citrus pectin-MgO nanocomposite were characterized by Powdered X-Ray Diffractometer (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electronic microscope (SEM). The antibacterial activity of pectin and pectin-MgO nanocomposite was extensively studied on clinical pathogens Bacillus subtilis and Lactobacillus. Antifungal activity was also studied against pathogenic organisms; Microsporum gypseum and Trichophyton mentagrophytes. They were also screened for antioxidant DPPH radical scavenging assay. The biological activity data showed that the citrus pectin-MgO nanocomposite is more potent than the pectin.

果胶是一种从橙皮中提取的生物聚合物。在从橙皮中提取果胶时，对干橙果皮进行酸水解，并使用乙醇继续沉淀。提取的果胶的百分比收率为12.25%。测定了果胶的当量重量、酯化度、甲氧基含量、AUA％和分子量。进一步通过共沉淀法制备了柑橘果胶-氧化镁纳米复合材料。通过粉末X射线衍射仪（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对提取的果胶和柑橘果胶-MgO纳米复合材料进行表征。果胶和果胶-氧化镁纳米复合材料的抗菌活性在临床病原体枯草芽孢杆菌和乳酸菌。还研究了针对病原体生物的抗真菌活性；石膏小孢子菌和须癣毛癣菌。他们还针对抗氧化剂 DPPH 自由基清除试验进行了筛选。生物活性数据表明柑橘果胶-氧化镁纳米复合物比果胶更有效。