by-product

trans-4-Hydroxycyclohexanecarboxylic Acid is an organic intermediate.

Quercetin, a flavonoid natural product, is a SIRT1 activator. It is also a PI3K inhibitor, inhibiting PI3Kγ, PI3Kδ, and PI3Kβ with IC50 values of 2.4, 3.0, and 5.4 μM, respectively. Recognized as a heat shock protein inhibitor, Quercetin can significantly reduce exosome release in TII models by downregulating Hsp70 or Hsp90.

Paclitaxel (Taxol) is a natural product and a microtubule polymer stabilizer. Paclitaxel has anti-tumor activity and causes cell death by inducing mitotic arrest, apoptosis, and cell autophagy.

Penicillamine (Artamine), possessing antineoplastic properties, induces apoptosis by a p53-mediated mechanism and inhibits angiogenesis by chelating with copper, a cofactor for angiogenesis. Artamine is a beta dimethyl analog of the amino acid cysteine. As a degradation product of penicillin antibiotics, Artamine chelates with heavy metals and increases their urinary excretion.

L-Lactic acid ((S)-2-Hydroxypropanoic acid) is a natural product produced by the anaerobic glycolysis of pyruvic acid. L-Lactic acid is a sensitive indicator of tissue hypoxia and can be used as a hemodynamic indicator in critically ill patients.

Thapsigargin is a natural product, an inhibitor of sarcoplasmic endoplasmic reticulum Ca2+ ATPase (SERCA) and an endoplasmic reticulum stress inducer. Thapsigargin increases cytoplasmic calcium concentration by blocking the ability of cells to pump calcium into the sarcoplasmic and endoplasmic reticulum.

Colchicine (Colcin) is a natural product that is an inhibitor of microtubule polymerization (IC50=3 nM) and blocks microtubule polymerization by binding to microtubule proteins. Colchicine can be used in the treatment of ventilation and rheumatic diseases.

Creatinine (NSC-13123) is the breakdown product of creatine, a constituent of muscle tissue, that is excreted by the kidney and whose serum level is used to evaluate kidney function.

Xanthine (Isoxanthine) is a product on the pathway of purine degradation. Xanthine is subsequently converted to uric acid by the action of the Xanthine oxidase enzyme. Xanthine is found in most body tissues and fluids in various organisms. Biologically Xanthine is produced from guanine by cypin (guanine deaminase). Furthermore, Xanthines act as antagonists for adenosine receptors, with selectivity depending on whether there are substitution of alkyl groups.

Taurocholic acid sodium salt hydrate (Sodium taurocholate hydrate), formed by the conjugation of taurine with cholic acid, is the primary ingredient in the bile of carnivorous animals. It acts as a detergent to solubilize fats for absorption and is employed as a cholagogue and choleretic.

3,4-Dimethylbenzoic acid (1-Carboxy-3,4-dimethylbenzene) is a product of dimethylbenzoate metabolism by Rhodococcus rhodochrous N75.

1,2-Dimethoxybenzene, a natural product secreted by Silene latifolia, is an effective pollinator for the nocturnal moth Hadena bicruris.

1,2,4-Trihydroxybenzene (Benzene-1,2,4-triol) is a by-product of coffee bean roasting and is found in mouse, arabica coffee.1,2,4-Trihydroxybenzene is a benzotriol that increases Ca2+ concentration in rat thymic lymphocytes.

Amylose is a polysaccharide composed of α-D-glucose units linked by α(1→4) glycosidic bonds, accounting for about 20% of the total amount of starch. Amylose spatial conformation curls into a helix and forms a blue complex with iodine, which is widely used in the food industry, and can be used in a variety of researches as a natural product and a biochemical reagent.

1,3-Propanediol is a natural product produced by microbial fermentation of glycerol.

Pyrrole-2-carboxylic acid (Minaline) was first identified as a degradation product of sialic acids, then as a derivative of the oxidation of the D-hydroxyproline isomers by mammalian D-amino acid oxidase. The latter relationship results from the lability of the direct oxidation product, A'-pyrroline-4-hydroxy-2-carboxylic acid, which loses water spontaneously to form the pyrrole. A similar reaction is catalyzed by the more specific allohydroxy-D-proline oxidase of Pseudomonas. In whole animal observations, pyrrole-2-carboxylate (PCA) ' was identified in rat or human urine after administration of the D-isomers of hydroxyproline, a finding ascribable to the action of D-amino acid oxidase. Urinary excretion of N-(pyrrole-2-carboxyl) glycine has been reported in a 5-year-old affected with type II hyperprolinemia; The child has mild developmental delay, recurrent seizures of the grand mal type and EEG alterations.

Sodium 2-hydroxybutanoate (alpha-hydroxybutyrate) is formed as a by-product of the formation of alpha-ketobutyrate via a reaction catalyzed by lactate dehydrogenase (LDH) or alpha-hydroxybutyrate dehydrogenase (alphaHBDH).

5-Hydroxyindole-3-acetic acid (5-HIAA) is a breakdown product of serotonin that is excreted in the urine. Serotonin and 5HIAA are produced in excess amounts by carcinoid tumors, and levels of these substances may be measured in the urine to test for carcinoid tumors (NCI).

Indole has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. It can be produced by bacteria as a degradation product of the amino acid tryptophan. It occurs naturally in human feces and has an intense fecal smell. At very low concentrations, however, it has a flowery smell, and is a constituent of many flower scents (such as orange blossoms) and perfumes.

4-Hydroxyphenylpyruvic acid is an enzyme inhibitor.4-Hydroxyphenylpyruvic acid (4-HPPA) is a keto acid that is involved in the tyrosine catabolism pathway. It is a product of the enzyme (R)-4-hydroxyphenyllactate dehydrogenase (EC 1.1.1.222) and is formed during tyrosine metabolism. The conversion from tyrosine to 4-HPPA is catalyzed by tyrosine aminotransferase. Additionally, 4-HPPA can be converted to homogentisic acid which is one of the precursors to ochronotic pigment. The enzyme 4-hydroxyphenylpyruvic acid dioxygenase (HPD) catalyzes the reaction that converts 4-hydroxyphenylpyruvic acid to homogentisic acid. A deficiency in the catalytic activity of HPD is known to lead to tyrosinemia type III, an autosomal recessive disorder characterized by elevated levels of blood tyrosine and massive excretion of tyrosine derivatives into urine. It has been shown that hawkinsinuria, an autosomal dominant disorder characterized by the excretion of 'hawkinsin,' may also be a result of HPD deficiency . Moreover, 4-hydroxyphenylpyruvic acid is also found to be associated in phenylketonuria, which is also an inborn error of metabolism. There are two isomers of HPPA, specifically 4HPPA and 3HPPA, of which 4HPPA is the most common.

3-Nitro-L-tyrosine (3-Nitrotyrosine) is the major product from the spontaneous reaction of peroxynitrite with tyrosine. Formation of nitrotyrosine can indicate the formation of peroxynitrite by a nitric oxide (NO)-dependent oxidative damage.

2-Ketoglutaric acid Sodium (AKG) is a key molecule in the TCA cycle. It can be produced from glutamate by oxidative deamination via glutamate dehydrogenase and as a product of pyridoxal phosphate-dependent transamination reactions (mediated by branched-chain amino acid transaminases) in which glutamate is a common amino donor.

2,5-Furandicarboxylic acid (Dehydromucic Acid) is a normal urinary metabolite in humans. 2,5-Furandicarboxylic acid is also a microbial metabolite, a product of the oxidation of hydroxymethylfurfural (HMF) by the enzyme furfural HMF oxidoreductase which is found in the bacterium Cupriavidus basilensis.

Acetosyringone (Acetosyringenin)(AS) is a phenol secreted by wounded plant tissues.Acetosyringone is a phenolic natural product with analgesic, antipyretic and anti-inflammatory actions.