Ultrasonic-assisted green extraction of peach gum polysaccharide for blue-emitting carbon dots synthesis

Raw peach gum is hard crystalline-like solid with very poor solubility, significantly restricting its application in various fields. This study optimized the parameters for ultrasonic-assisted peach gum polysaccharides (UPGP) extraction. The results showed that the maximum extraction rate was up to 80.1% under the optimized conditions of 5 h extraction time, 90 mL/g water to raw peach gum ratio and 532 W ultrasonic intensity at 95 degrees C. The acquired UPGP mainly consisted of Ara, Gal and Man with a molecular weight of 8.18 x 10(6) g/mol. Moreover, the UPGP has been used as a green precursor for carbon dots (CDs) preparation through a simple one-step hydrothermal reaction. The synthesized CDs had a mean particle diameter of 7.66 nm and showed excellent fluorescence intensity and stability. Thus, this study improved the utilization of raw peach gum and further broadened the UPGP application.

Automated summary

By optimizing the extraction parameters, high extraction rate and molecular weight peach gum polysaccharides were successfully obtained, which were further used as precursors for carbon dots preparation with excellent fluorescence intensity and stability.