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Yellow acidic form (left) and blue basic form (right) of bromothymol blue. [4] Bromothymol blue is sparingly soluble in oil, but soluble in water, ether, and aqueous solutions of alkalis. It is less soluble in nonpolar solvents such as benzene, toluene, and xylene, and practically insoluble in petroleum ether. [5]
The FDA’s recent ban on Red Dye No. 3, set to take effect by 2027 for foods and 2028 for drugs, marks a significant step in addressing safety concerns over artificial food dyes in the U.S. food ...
The increase in pH then causes color change in the bromothymol blue indicator, turning it blue. Under neutral conditions the medium remains a green color. The color change to blue is useful because growth on Simmons' citrate agar is often limited and would be hard to observe if it were not for the color change.
Bromothymol blue is the indicator used in the agar, it changes to yellow in case of acid production during fermentation of lactose or changes to deep blue in case of alkalinization. Lactose-positive bacteria build yellow colonies. Bacteria which decarboxylate L-cystine cause an alkaline reaction and build deep blue colonies. [1]
Both the cosmetic and food bans of Red Dye No. 3 are the result of a single study published in 1987. In the study, male rats fed a diet where the dye made up four percent of the diet had higher ...
Bacteria are inoculated on a medium containing sodium citrate and a pH indicator such as bromothymol blue. The medium also contains inorganic ammonium salts, which are utilized as sole source of nitrogen. Use of citrate involves the enzyme citrate lyase, which breaks down citrate to oxaloacetate and acetate.
High-fiber foods: "Things like kale, beans, lentils, whole grains, and even popcorn are bulky, fibrous foods that take up a lot of space, and in general these are the most likely to provoke the G ...
Acid blue 74 73015 indigoid 860-22-0: Indigo carmine (natural) Natural blue 2 Food blue 1 75781 natural 860-22-0: Indocyanine green: Cardiogreen cyanine 3599-32-4: Induline: Solvent blue 7 50400 azine 8004-98-6: Iodine green 42556 triarylmethane 33231-00-4: Isosulfan blue: Patent blue violet Acid blue 1 Food blue 3 42045 triarylmethane 129-17-9 ...