d-isomer

D-Cysteine, the D-isomer of cysteine, is a powerful inhibitor of E. coli growth and is mediated by D-amino acid oxidase to produce H2S, serving as a neuroprotective agent against cerebellar ataxia. Additionally, D-cysteine can inhibit the growth and cariogenicity of a two-species biofilm formed by Streptococcus mutans and Streptococcus hemoglobin.

D-Mannopyranose is a hexose or fermentable monosaccharide and isomer of glucose from manna, the ash Fraxinus ornus and related plants.

(R)-pyrrolidine-2-carboxylic acid (D-Proline) is an isomer of the naturally occurring amino acid L-Proline. D-amino acids, including D-Proline, are found in relatively high abundance in human plasma and saliva, potentially originating from bacterial sources or endogenous production via amino acid racemase activity.

N-Methyl-D-aspartic acid is an amino acid that, as the D-isomer, is the defining agonist for the NMDA (N-Methyl-D-aspartic acid) receptor subtype of glutamate receptors.

D-Lysine is the D-isomer of L-Lysine, prepared by chemical racemization and microbial asymmetric degradation of L-Lysine.D-Lysine reduces renal uptake of radiolabeled peptides and decreases nephrotoxicity.

D-Tyrosine, the D-isomer of tyrosine, acts as a negative regulator of melanin synthesis by inhibiting tyrosinase activity. Furthermore, D-Tyrosine also inhibits biofilm formation and induces the self-dispersal of biofilms, while not affecting bacterial growth.

D-(-)-Lactic acid sodium (Sodium D-lactate) is a microbial metabolite and a chiral molecule commonly used in glycolysis-related studies. Among its isomers, the L-isomer is the most prevalent in biological systems.

D-Tagatose (D-(-)-Tagatose), a rare natural hexoketose and isomer of D-galactose, occurs naturally in Sterculia setigera gum and is found in small quantities in various foods such as sterilized and powdered cow's milk, hot cocoa, and various cheeses, yogurts, and other dairy products. It can be synthesized from D-galactose by isomerization under alkaline conditions in the presence of calcium. D-Tagatose has numerous health benefits, including promotion of weight loss, no glycemic effect, anti-plaque, non-cariogenic, anti-halitosis, prebiotic, and anti-biofilm properties; it is beneficial for organ transplants, enhancement of flavor, improvement of pregnancy and fetal development, treatment of obesity, and reduction in symptoms associated with type 2 diabetes, hyperglycemia, anemia, and hemophilia. (PMID: 17492284).

(Z)-Ganoderenic acid D, the Z-isomer of Ganoderenic acid D, is a triterpenoid isolated from Ganoderma. This compound contributes to the bitterness of basidiomata and extracts of Ganoderma species. Furthermore, Ganoderenic acid D inhibits cancer cell proliferation by inducing cell cycle arrest and apoptosis (apoptosis).