Comparison the Antibacterial Activity of Vitamin D2 and D3

Abstract

An attempt has been made to determine the antimicrobial activity of vitamin D; D3 & D2 against clinical bacterial isolates as well as perform a comparative analytical study between the effects of both forms of vitamin. The ability of vitamin D (both D2 ergocalciferol& D3 cholecalciferol ) to inhibit bacterial growth of some clinical isolates have been tested . Forty - three pathogenic bacterial isolates (Gr+ ,Gr- ) have been identified from fifty - five specimen was collected from different sources ; 24 urine, 17 sputum , 9 blood , 5 skin at Al-Kindey hospital for a period of two months . Antibiotic sensitivity was carried out towards 12 different antibiotic discs. The most resistant isolates have been chosen to be tested in the study. Two bacterial suspensions of the selected isolates have been prepared; the first was adjusted to McFarland standard No. 0.5 (1 ×10 8 CFU /mL); the second = 1×1010 CFU /mL. Three concentrations of both vitamins have been prepared; 50,000, 70,000 and 90,000 IU/mL as well as the control ( solvent only ). Antibacterial activity has been examined by using agar diffusion (pore plating method) to determine the most effective concentration among the three concentrations of the two forms of vitamin D. Results were suggesting the important role of vitamin D specially D3 as antibacterial agent .The third concentration (90,000) IU/mL was causing the largest inhibition zone with all tested isolates even with the high turbidity culture (1010CFU/mL) ,followed by the second one (70,000) IU/mL, the lower inhibitor concentration was (50,000) IU/mL. Significant differences have been appeared among the measurements of the diameters of inhibition zones towards three vitamin concentrations when compared one to another and to control.