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- W2147201890 abstract "Sterols, sterylglycosides (SG), acylated sterylglycosides (ASG) and steroidal saponins of primary leaves of oat (Avena sativa L. cv. Flämingskrone) were analyzed by thin-layer chromatography, gas-liquid chromatography and high-performance liquid chromatography. Intact leaves, epidermis preparations, epidermis-stripped leaves, isolated protoplasts and chloroplasts were compared. The mesophyll contained 79% of the total leaf sterols, 80% of the SG and 78% of the ASG, but only 33–67% of the saponins. Free sterols, SG and ASG were mainly localized within the mesophyll, whereas steroidal saponins were localized in the epidermis to a significantly higher extent. The sterol parts consisted mainly of sitosterol, stigmasterol. cholesterol. Δ5-avenasterol, Δ7-avenasterol, campesterol and Δ7-cholestenol, and were quantitatively different in different sterol groups. A higher percentage of sitosterol at the expense of stigmasterol was typical for SG and ASG as compared to free sterols. Only minor differences in the sterol composition were found in a given sterol group when isolated from different tissues. Isolated protoplasts contained only 5–9% of the sterols present in mesophyll cells, indicating that the major part of the free sterols was lost during isolation. Exposure of radioactively labelled leaf segments to either buffer or digestion medium induced rapid transformation of sterols to SG and ASG as shown by the shift of radioactivity from free sterols to the glyeosides. This suggests that two sterol pools exist in the cell: one in the plasmalemma, which is accessible to medium-induced transformation, and a second non-accessible pool in the interior membranes (e.g. chloroplasts) of the cell." @default.
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- W2147201890 title "Sterols and sterylglycosides of oats (Avena sativa). Distribution in the leaf tissue and medium-induced glycosylation of sterols during protoplast isolation" @default.
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