出版社：Defence Scientific Information & Documentation Centre
摘要：A quick test for quality deterioration of milk powder, refined oil and atta, based on the indicator test solution was studied. The indicator test solution comprising NaOH and bromotIlytnol blue indicator remains stable for 6 mont1ls itl glass bottles. Depending on the acidity of the Sample, the colour changed from blue to light blue to green to yellow. The concentration of the indicator test solution is optimised for each product, viz., 4 ml for milk powder and refined oil and 2 ml for atta, to which 1 ml aqueous sample or oil is added which gives the colour change. The appearance of green colour is considered tIle cutoff point for inferior quality alld is based on the limits specified by the Bureau of Indian Standards for these products. The test has proved its efficacy in quality checking during storage of milk powder and deep fat frying of products in refined oils.
