Determinación de macro elementos en exudado de hojas de zábila (Aloe vera (L.) Burm. f.)

the objective of this work was to determine the metals in aloe vera (l.) burm. f. (zabila). theses metals are necessary in the human organism; namely: na, k, ca y mg. it was digested for 1 hour in a hot plate at 70 oc 0.25 g of lyo-philized exudate with 1:2 nitric acidic and hydrogen peroxi-de. it was no found significatives statistics differences at 95% of confidence between the standard calibration curve and the aqueous calibration curve, so no matrix effect was observed. the recovery studies was satisfactory, the mean value was 99.77 ± 2%. it was no found significatives statistics differences at 95% of confidence between the certificated values (nbs: citrics leaves 1572) of studied metals and the values found with the applied methodology. the concentrations of these elements in the real composed samples were: na: 0.24 ± 0,03% w/w; k: 0.69 ± 0,13% w/w; ca: 0.07 ± 0,01% w/w; mg: 0.01 ± 0,00% w/w. the method used to determine the determined elements was exact, pre-cise and free from interferences.