Changes of composition in triacylglycerols, Sterols and tocopherols of flax during the vegetation

TENEVA, O., М. ZLATANOV, G. ANTOVA and M. MARCHEVA, 2014. Changes of composition in triacyl­ glycerols, sterols and tocopherols of flax during the vegetation. Bulg. J. Agric. Sci., 20: 122­126 The changes of content and composition of flax seed fatty acids, sterols and tocopherols during vegetation in period April ­ July were investigated. The quantity of glyceride oil increased from 174 ­ 327g.kg ­1 between 21 ­ 35 day after flowering. In the triacylglycerol fraction the content of oleic acid decreased from 383 g.kg ­1 to 322 g.kg ­1 at the expense increasing of linolenic acid (from 294 to 342 g.kg ­1 ). In sterol esters higher content of monounsaturated oleic acid was detected – from 392 g.kg ­1 at 21 day after flowering to 517 g.kg ­1 at 35 day after flowering. The quantity of stearic acid decreased from 167 g.kg ­1 to 107 g.kg ­1 . The content of sterols was 4 g.kg ­1 in whole period. β ­ Sitosterol was the main component in free (454 – 523 g.kg ­1 ) and esterified sterols (553 – 566 g.kg ­1 ) during vegetation, followed by campesterol. The percentage of tocopherols was highest in the first stage of development (975 mg/kg vs 898 mg/kg) in the last period.