The titrimetric and curcumin methods gave mean values for boric acid which were significantly (P < 0路05) higher than those of the carminic acid method. Results with the titrimetric method did not differ from those with the curcumin method; the latter method gave good recoveries (鈭 100%...
A modified method for determination of boron with curcumin and a simplified water elimination procedure The formation of boric acid ester with curcumin is usually performed in highly acidic solution in the absence of water. Small water contents are permissible, but the efficiency is lowered. The wat...
Reports from the 19th century and earlier indicate that adulteration of foods with fillers, coloring agents, and preservatives was widespread. Some of these adulterants such as copper sulfate and boric acid were quite toxic by present-day standards. After many years of effort, beginning as early ...
食品中水分的测定(Determination of moisture in foods) Determination of moisture in foods [teaching objectives]: 1. master the concepts and knowledge of evaporation, drying, constant weight, concepts and knowledge of water, moisture, activity, etc.. 2. master balance weighing operation, proper use ...
Phosphoric Acid (85%) 625 g 3.29 g/l (NH4)2SO4 523 g 2.75 g/l MgSO4.7H2O 211 g 1.11 g/l Trace metal 8 solution 950 ml 5.0 ml/l ___ The volume of the fermentor was adjusted to 200 liters with sterile water, and the pH adjusted to pH 6.0 with anhydrous ammonia. C. Fed-bat...
BORIC ACID AS A NATURAL CONSTITUENT OF FOODSBORIC ACID AS A NATURAL CONSTITUENT OF FOODS..doi:10.1016/S0140-6736(01)37562-1NoneElsevierLancet
THE NATURAL PRESENCE OF BORIC ACID IN FOODS.THE NATURAL PRESENCE OF BORIC ACID IN FOODS..doi:10.1016/S0140-6736(01)56604-0Ford, KathrynDavenport, MarkElsevierLancet
Comparison of the results from each of the samples indicated that acidified 70% aqueous methanol at pH 4.0 provided the best overall performance, whereas a methanol/boric acid (pH 9.2) mixture displayed poor extraction efficiency. Extraction with acidified 70% aqueous methanol showed seven of eight...
Comparison of the results from each of the samples indicated that acidified 70% aqueous methanol at pH 4.0 provided the best overall performance, whereas a methanol/boric acid (pH 9.2) mixture displayed poor extraction efficiency. Extraction with acidified 70% aqueous methanol showed seven of eight...
Boric acid is added to the aqueous sample solution to form borate complexes with substances of polyhydroxyl nature and make them migrate isotachophoretically. Using conductivity detection, the calibration curves in the tested concentration range up to 2.5 mM were linear for all components of ...