Glycin
Encyclopedia
Glycin, or N-glycine, is N-substituted p-aminophenol. It is a photographic developing agent used in classic B&W developer solutions. It is a derivative of the amino acid
glycine
. When fresh, it is typically characterized as thin plates of white or silvery powder, turning brown with age. It is sparingly soluble in water and most organic solvents; it is readily soluble in alkalies and acids.
Glycin is related to 4-aminophenol and Metol
. Compared to Metol, glycin has a carboxyl group attached to the methyl group of the Metol. This weakens the reduction potential of the compound and the two developers have markedly different character. Glycin is slower acting, but much longer lasting in solution. Glycin is rarely used as a developing agent today, primarily because it is expensive and manufactured for specialty applications only. In its dry form, it also has limited shelf life compared to Metol and Phenidone.
Glycin can be synthesized by a number of ways. One method is to react p-aminophenol with chloracetic acid in a solvent and purify glycin.
Other uses of glycin can be found in some procedures of analytical chemistry.
Amino acid
Amino acids are molecules containing an amine group, a carboxylic acid group and a side-chain that varies between different amino acids. The key elements of an amino acid are carbon, hydrogen, oxygen, and nitrogen...
glycine
Glycine
Glycine is an organic compound with the formula NH2CH2COOH. Having a hydrogen substituent as its 'side chain', glycine is the smallest of the 20 amino acids commonly found in proteins. Its codons are GGU, GGC, GGA, GGG cf. the genetic code.Glycine is a colourless, sweet-tasting crystalline solid...
. When fresh, it is typically characterized as thin plates of white or silvery powder, turning brown with age. It is sparingly soluble in water and most organic solvents; it is readily soluble in alkalies and acids.
Glycin is related to 4-aminophenol and Metol
Metol
Metol is the chemical compound with the name monomethyl-p-aminophenol hemisulfate. It is a developing agent used in black & white photographic developers...
. Compared to Metol, glycin has a carboxyl group attached to the methyl group of the Metol. This weakens the reduction potential of the compound and the two developers have markedly different character. Glycin is slower acting, but much longer lasting in solution. Glycin is rarely used as a developing agent today, primarily because it is expensive and manufactured for specialty applications only. In its dry form, it also has limited shelf life compared to Metol and Phenidone.
Glycin can be synthesized by a number of ways. One method is to react p-aminophenol with chloracetic acid in a solvent and purify glycin.
Other uses of glycin can be found in some procedures of analytical chemistry.