An Efficient Approach for Separating Essential Oil and Polysaccharides Simultaneously from Fresh Leaves of Guajava by Microwave-Mediated Hydrodistillation with Lithium Salts and Antibacterial Activity of Essential Oil

The essential oils and polysaccharides from guava leaves have important functions. In the process of microwave extraction plant polysaccharides, pretreatment with lithium salts solution is helpful to increase rate. experiment was conducted using a single factor method. Results were optimized by principal component analysis response surface optimization. optimal conditions were: LiCl dosage 45 ?mol, time 40 min, liquid-solid ratio 10, homogenization 4.2 liquid-material irradiation power 700 W. highest yield oil polysaccharide 10.27 ± 0.58 mL/kg dry weight (DW) 50.31 1.88 g/kg·DW, respectively. Three verification experiments showed that rate method higher than traditional heating addition, bacteriostatic zones reached maximum 23.7 0.11 mm when concentration ?L/mL, above results practical significance.