Riboflavin sodium phosphate

  Riboflavin sodium phosphate [properties] this product is an orange yellow crystalline powder, almost odorless, slightly bitter and hygroscopic. This product dissolves in water,. [identification] (1) take about 1mg of this product and dissolve it with 100ml of water. The solution shows light yellow and strong yellow green fluorescence under transmitted light; When inorganic acid or alkali solution is added, the fluorescence disappears. (2) Take this product and add phosphate buffer (pH 7.0) to make it. It contains 10% in 1ml μ G solution, determined by spectrophotometry (Appendix Ⅳ a), there are * * large absorption at the wavelengths of 267nm, 372nm and 444nm and * * small absorption at the wavelengths of 240nm. (3) The infrared light absorption spectrum of this product should be consistent with the control spectrum (spectrum set 628). (4) Take 0.5g of this product, add 10ml nitric acid, evaporate it on a water bath, burn it, add 5ml water to dissolve the residue, filter it if necessary, and the filtrate shows the identification reaction of sodium salt (Appendix III).