Journal
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
Volume 222, Issue 1-2, Pages 32-35Publisher
SPRINGER
DOI: 10.1007/s00217-005-0011-4
Keywords
Asparagus officinalis L; levels of steroid saponins; effect of cultivars; effect of deep freeze storage; HPTLC; MS; SPE
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A method was developed to prepare saponin samples of asparagus spears by Solid Phase Extraction (SPE) and to analyse these extracts by High Performance Thin Layer Chromatography (HPTLC). We chose six asparagus cultivars grown in Germany and measured total saponin contents of approximately 0.14-0.80 g kg(-1) fresh weight (fw). Among these six cultivars grown under eaqual conditions 'CyGrolim' showed the highest levels of saponins while 'CyHuchels Alpha' had the lowest contents. The other four cultivars gave intermediate levels. Asparagus stored at -18 degrees C subsequently resulted in maintenance of saponins during 20 weeks of storage. Up to six saponins were found in the extracted samples, but three of them were the main compounds with approximately 90% of the total saponin content. Two main saponins (AS 1 and AS 2) were characterised by mass spectrometry as protodioscin and methyl-protodioscin.
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