Ashing techniques in the determination of macronutrient contents in carrot root samples (Daucus carota L.).

To choose a suitable method for the digestion of carrot root samples (Daucus carota L.) five dry ashing techniques were used and compared with the standard wet ashing method. The analysis of the data was based on a randomized complete block design, with five replications. No significant differences with the standard method for P and Ca determination were found but in K evaluation, employing the dry ashing technique at a temperature lower than 550 oC, and in Na evaluation at 600 oC significant differences were obtained. Correlation coefficients between the elements studied and ash content were assessed, and a significant correlation in most cases was found. The results obtained showed that ashing techniques employed were effective. Key words: carrots, mineral content, dry ashing, wet ashing.