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https://www.selleckchem.com/products/gdc-0068.html Ceramides (Cer) and cerebrosides are important sphingolipids (SL) involved in many biological processes. Herein, the SL content of yellow lupin seeds (Lupinus luteus) was determined by liquid-liquid extraction, mild alkaline hydrolysis (1 h at 37 °C) and reversed-phase liquid chromatography with negative electrospray ionization coupled to either an orbital-trap (Fourier-transformed, FT) or linear ion-trap (LIT) mass spectrometry (RPLC-ESI/MS). The chemical identity of SL including the sugar residues and sphingoid backbone (SB) was inferred by collision-induced dissociation multiple-stage mass spectrometry (MSn, n = 2,3). Up to 52 Cer and 47 cerebrosides were successfully recognized and quantified in sample extracts of L. luteus seeds also counting isobaric species. As reported for other vegetables, a hydroxylated SB was observed whereby the N-acyl chains showed a high occurrence of very-long-chain moieties; phytosphingosine and 4-hydroxy-8-sphingenine were the predominant SB paired mainly with oleic acid (C181), hydroxylated behenic acid (C220;1) and hydroxylated lignoceric acid (C240;1). Fluorescence techniques and circular dichroism (CD) were utilized to investigate the interactions of a typical gallotannin 1,2,3,4,6-penta-O-galloyl-β-D-glucopyranose (PGG) and two simple phenolic compounds ellagic acid (EA) and gallic acid (GA) with bovine serum albumin (BSA). Fluorescence experiments showed that PGG and EA could strongly interact with BSA. The binding constants showed a pH-dependent binding of phenolic acids by BSA. The CD spectra revealed that GA, EA and PGG has slight effect on the secondary structure of BSA at the low concentration (50 μM). However, obvious alterations of the secondary structure of BSA were observed at high concentrations (from 100 μM to 500 μM). The interaction of GA, EA and PGG at high concentrations with BSA caused an unfolding of the secondary structure of BSA. PGG has a greater impact on
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