Abstract
Ten to 16 ethanol-soluble carbohydrate components were identified in the seeds of six Mexican wild lupins. The analysed carbohydrates included: monosaccharides, disaccharides, cyclitols, galactosyl cyclitols and raffinose family oligosaccharides. Stachyose and sucrose were the main carbohydrate component in the <em>Lupinus montanus</em>, <em>L. rotundiflorus</em>, <em>L. exaltatus</em>, <em>L. mexicanus </em>and <em>L. elegans</em> seeds. Only trace quantities of verbascose were detected in <em>Lupinus mexicanus </em>seeds. The analysed seeds accumulated 38 to 78 mg/g d.m. carbohydrates. The raffinose family oligosaccharides constituted 41 to 85.2% of the identified carbohydrate component pool. The analysed <em>Lupinus </em>seeds contained 3 to 8 unidentified carbohydrate components.
Highlights
Lupins belong to the family of Leguminosae and the sub-family of Papilionoideae
Sixteen known carbohydrate components were identified in the analysed seeds and they included: monosaccharides, disaccharides, cyclitols, galactosyl cyclitols and raffinose family oligosaccharides
The greatest number of unknown compounds was found in Lupinus montanus and Lupinus madrensis, whereas the least number was found in the seeds of Lupinus elegans
Summary
Lupins belong to the family of Leguminosae and the sub-family of Papilionoideae They include about 300 species that, in the scientific literature, are referred to by over 2000 synonyms (Gladstones 1998). Crop scientists have made significant progress into domesticating two lupine species: Lupinus pilosus and Lupinus atlanticus (Buirchell and Cowling 1992). Due to their high nutritive value, interest in lupins has been increasing both in Latin America and Europe. Generative part of lupins are rich source of soluble carbohydrates, which are presented mainly by sucrose and a-D-galactosides of sucrose and cyclitols (Górecki et al 1997b; Muzquiz et al 1999) These carbohydrates includes: raffinose family oligosaccharides (RFO) raffinose, stachyose and verbascose and galactosyl cyclitols. The structures of these carbohydrates, especially RFO, are well know and described in literature (Dey 1985; Arentoft and Sörensen 1992; Horbowicz and Obendorf 1994; Hedley 2000)
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