56271-60-4

Upstream product

• 67-56-1 methanol 
• 75-77-4 chloro-trimethyl-silane 
• 25561-30-2 N,O-Bis(trimethylsilyl)trifluoroacetamide 
• 182818-72-0 (S)-11-[(3aR,4R,6S,7S,7aR)-2,2,6-Trimethyl-7-((2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyl-tetrahydro-pyran-2-yloxy)-tetrahydro-[1,3]dioxolo[4,5-c]pyran-4-yloxy]-hexadecanoic acid methyl ester 
• 929296-54-8 (S)-11-((2R,3R,4R,5S,6S)-3,4,5-Triacetoxy-6-methyl-tetrahydro-pyran-2-yloxy)-hexadecanoic acid methyl ester 
• 115655-84-0 1-(methoxycarbonyl)pentadec-10(S)-yl 2,3-O-isopropylidene-α-L-rhamnopyranoside 
• 182818-70-8 1-(methoxycarbonyl)pentadec-10(S)-yl α-L-rhamnopyranoside 
• 115681-38-4 merremoside i methyl ester 
• 121043-12-7 merremoside a 
• 121043-13-8 merremoside c 
• 1128-40-1 methyl L-rhamnopyranoside 

Relevant academic research and scientific papers

Characterization of ulvan extracts to assess the effect of different steps in the extraction procedure

An effective application development of the polysaccharide ulvan requires a comprehensive knowledge about the influence of the extraction process on composition of the extracts and in ulvan itself. In this context, the two main objectives of the present work are (1) the establishment of an efficient extraction process for ulvan and (2) development of an accurate characterization methodology to evaluate the extract composition and ulvan content. Three ulvan-rich extracts obtained by different schemes of extraction were studied. The methodology for the analysis was improved and a detailed analysis of extracted ulvan was provided. The polysaccharide is rich in ulvanobiuronic acid 3-sulfate type A [→4)-β-d-GlcAp-(1 → 4)-α-l-Rhap 3S-(1→], with minor amounts of ulvanobiuronic acid 3-sulfate type B [→4)-α-l-IdoAp-(1 → 4)-α-l-Rhap 3S-(1→]. The extract with the higher degree of purification is a high molecular weight polysaccharide (790 kDa) composed of rhamnose (22.4%), glucuronic acid (22.5%), xylose (3.7%), iduronic acid (3.1%) and glucose (1.0%). It is highly sulfated (32.2%) and contains 1.3% of proteins and 10.3% of inorganic material. Applying simple extraction scheme it was possible to obtain an extract from green algae with high content of ulvan without affecting the overall chemical structure of the polysaccharide.

Indonesian medicinal plants. XV. Chemical structures of five new resin- glycosides, merremosides a, b, c, d, and e, from the tuber of Merremia mammosa (Convolvulaceae)

Five new resin-glycosides, named merremosides a (1), b (2), c (3), d (4), and e (5), were isolated from the tuber of Merremia mammosa (LOUR.) HALLIER f. (Convolvulaceae), an Indonesian medicinal plant. The structures of 1, 2, 3, 4, and 5 have been elucidated on the basis of chemical and physicochemical evidence, including syntheses of (11S)-(+)- and (11R)-(-)- jalapinolic acid (16b and 18b) and the glycosidic acid designated as merremoside i (6).