Profile of (n‐9) and (n‐7) Isomers of Monounsaturated Fatty Acids of Radish (Raphanus sativus L.) seeds

Abstract

AbstractThe present study was undertaken to determine the profile of the (n‐9) and (n‐7) isomers for C18:1, C20:1 and C22:1 fatty acids in radish seeds as well as their isomers. Radish (Raphanus sativus L. cvs. ‘Antep, Beyaz, Cherry Belle and Iri Kırmızı’) seeds were produced in 2003–2005 from different sowing dates (SD). The n‐7 isomers of C18:1, C20:1 and C22:1 ranged from 0.7 to 1.3, 0.1 to 0.3 and 0.4 to 1.1 %, respectively. The average values of C18:1(n‐7) was highest (1 %) amongst the three acids. The ratios of (n‐7)/(n‐9) ranged from 4.5 % (‘Cherry Belle’, SD‐I) to 8.3 % (‘Antep’, SD‐III), 0.8 % (‘Iri Kırmızı’, SD‐II) to 3 % (‘Iri Kırmızı’, SD‐I) and 1.6 % (‘Cherry Belle’, SD‐I) to 3.7 % (‘Iri Kırmızı’, SD‐I) for C18:1, C20:1 and C22:1. Erucic acid was the principal fatty acid with concentrations of nearly 34–39 % in ‘Antep’, 32–34 % in ‘Cherry Belle’, 30–33 % in ‘Beyaz’ and 21–22 % in ‘Irı Kırmızı’. The oleic acid content was higher in SD‐I and SD‐II than SD‐III in all cultivars. Correlation studies revealed that palmitoleic acid (C16:1) had a significant relationship between most of the fatty acids of the (n‐7)/(n‐9) family. The results indicated that palmitoleic acid is important in the synthesis of long‐chain fatty acids and that the data for the (n‐7)/(n‐9) ratios for C22:1 could be used as biochemical markers to determine the similarities or differences between radish cultivars.