Quantitation of Toxic Steroidal Glycoalkaloids and Newly Identified Saponins in Post-Harvest Light-Stressed Potato (Solanum tuberosum L.) Varieties

• DOI: 10.1021/acs.jafc.2c02578
• Publication Date: 2022-07-01T08:22:38Z
• Authors: Sebastian Baur; Nicole Bellé; Hans Hausladen; Sebastian Wurzer; Laura Brehm; Timo D. Stark; Ralph Hücklhoven; Thomas Hofmann; Corinna Dawid
• Keywords: Solanine; Plant Tubers; 0303 health sciences; 03 medical and health sciences; Saponins; Solanum tuberosum

Although domesticated potatoes contain a large variety of steroidal glycoalkaloids (SGAs) and saponins, in the past, many research projects mainly focused on the two major SGAs, α-solanine and α-chaconine. This study investigates the quantitative changes, induced by post-harvest LED light exposure, of six SGAs and four saponins in 12 potato cultivars at three different time points (1, 7, and 16 days), by using ultra-performance liquid chromatography tandem mass spectrometry. Altogether, SGA contents of 3.0-17.1 mg/100 g fresh weight (FW) could be observed in the analyzed tubers with potato varieties highly exceeding the newly discussed safety limit of 10 mg/100 g. The overall contents of 0.1-5.4 mg/100 g FW of the so far barely studied saponins, like protoneodioscin or barogenin-solatrioside, highly differed between the assayed potato cultivars. Furthermore, cultivar-specific regulations of SGAs and saponins could be observed due to light exposure.