The constitution of <i>Tamarindus</i>‐amyloid

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<jats:title>Abstract</jats:title><jats:p>The preparation of <jats:italic>Tamarindus</jats:italic>‐amyloid from seeds of <jats:italic>Tamarindus indica</jats:italic> L. is described in detail.</jats:p><jats:p>The product was homogeneous under conditions of free boundary electrophoresis and of sedimentation in the ultracentrifuge. A tentative value for a molecular weight of 115,000 was found.</jats:p><jats:p>Partial hydrolysis of the polysaccharide with <jats:italic>Myrotheciwn</jats:italic>‐cellulase liberated a hepta‐, an octa‐ and a nona‐saccharide, while a fungal enzyme “Luizym” yielded 6‐O‐α‐D‐xylopyranosyl‐D‐glucopyranose.</jats:p><jats:p>Partial hydrolysis with dilute mineral acid gave the disaccharide 2‐O‐β‐D‐galactopyranosyl‐D‐xylopyranose.</jats:p><jats:p>Experimental evidence is presented for the following structural features:</jats:p><jats:p><jats:list list-type="explicit-label"> <jats:list-item><jats:p>A main chain of β 1,4‐linked glucose residues.</jats:p></jats:list-item> <jats:list-item><jats:p>A xylose residue attached by an α 1,6‐linkage to three glucose residues out of every four.</jats:p></jats:list-item> <jats:list-item><jats:p>The three substituted glucose residues and the unsubstituted one alternate regularly.</jats:p></jats:list-item> <jats:list-item><jats:p>The galactose residues are attached to the xylose residues by β 1,2‐linkages.</jats:p></jats:list-item> </jats:list></jats:p><jats:p>On the basis of this evidence a structure for <jats:italic>Tamarindus</jats:italic>‐amyloid is proposed.</jats:p>

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