Single-stage ultrasound-assisted process to extract and convert α-solanine and α-chaconine from potato peels into β-solanine and β-chaconine
Potato peels are rich in α-solanine and α-chaconine, which are glycoalkaloids with known pharmacological activity but that have high cytotoxicity. Their aglycones (β-solanine and β-chaconine) have the same pharmacological activity but with a much lower cytotoxicity. In this work, we applied ultrasound technology to extract α-solanine and α-chaconine from potato peel and at the same time convert these molecules into β-solanine and β-chaconine, in a single-stage process without resorting to organic solvents. The extraction was studied varying ultrasonic power density (20, 35, and 50 W/L) and processing time (5, 10, 20, and 40 min) using an ultrasonic bath operating at 25 kHz. The chemical analysis was done by UHPLC-qTOF-MS and the results were evaluated by HCA, PCA, and PLS-DA chemometric analysis. The analysis of the single-stage procedure pointed to the viability of concomitant extraction and chemical conversion of α-solanine and α-chaconine into β-solanine and β-chaconine when operating at an ultrasonic power density of 35 and 50 W/L and subjecting the potato peel power to 20 and 40 min of ultrasound.
KeywordsGlycoalkaloids Solanum tuberosum Solanine Chaconine Ultrasound Chemical conversion Extraction
The authors thank the NMR Lab of UFSCar (São Carlos, Brazil) for enabling the use of the chemometric program.
The authors thank the financial support and scholarships provided by the Brazilian funding agencies CAPES, FUNCAP, and CNPQ.
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