Exact Mass: 138.0469
Exact Mass Matches: 138.0469
Found 219 metabolites which its exact mass value is equals to given mass value 138.0469,
within given mass tolerance error 0.01 dalton. Try search metabolite list with more accurate mass tolerance error
0.001 dalton.
Urocanic acid
Urocanic acid (CAS: 104-98-3) is a breakdown (deamination) product of histidine. In the liver, urocanic acid is an intermediate in the conversion of histidine to glutamic acid, whereas, in the epidermis, it accumulates and may be both a UV protectant and an immunoregulator. Urocanic acid (UA) exists as a trans isomer (t-UA, approximately 30 mg/cm2) in the uppermost layer of the skin (stratum corneum). t-UA is formed as the cells of the second layer of the skin become metabolically inactive. During this process, proteins and membranes degrade, histidine is released, and histidase (histidine ammonia lyase) catalyzes the deamination of histidine to form t-UA. t-UA accumulates in the epidermis until removal by either the monthly skin renewal cycle or sweat. Upon absorption of UV light, the naturally occurring t-UA isomerizes to its cis form, c-UA. Because DNA lesions (e.g., pyrimidine dimers) in the lower epidermis can result from UV-B absorption, initial research proposed that t-UA acted as a natural sunscreen absorbing UV-B in the stratum corneum before the damaging rays could penetrate into lower epidermal zones. Researchers have found that c-UA also suppresses contact hypersensitivity and delayed hypersensitivity, reduces the Langerhans cell count in the epidermis, prolongs skin-graft survival time, and affects natural killer cell activity. (E)-Urocanic acid is found in mushrooms. It has been isolated from Coprinus atramentarius (common ink cap) and Phallus impudicus (common stinkhorn). Trans-urocanic acid, also known as 4-imidazoleacrylic acid or urocanate, belongs to imidazolyl carboxylic acids and derivatives class of compounds. Those are organic compounds containing a carboxylic acid chain (of at least 2 carbon atoms) linked to an imidazole ring. Trans-urocanic acid is soluble (in water) and a weakly acidic compound (based on its pKa). Trans-urocanic acid can be found in mung bean, which makes trans-urocanic acid a potential biomarker for the consumption of this food product. Trans-urocanic acid can be found primarily in most biofluids, including sweat, feces, blood, and urine, as well as in human liver and skin tissues. Trans-urocanic acid exists in all living organisms, ranging from bacteria to humans. In humans, trans-urocanic acid is involved in the histidine metabolism. Trans-urocanic acid is also involved in a couple of metabolic disorders, which include ammonia recycling and histidinemia. Urocanic acid, produced in the upper layers of mammalian skin, is a major absorber of ultraviolet radiation (UVR). Urocanic acid, produced in the upper layers of mammalian skin, is a major absorber of ultraviolet radiation (UVR).
4-Nitroaniline
CONFIDENCE standard compound; INTERNAL_ID 1340; DATASET 20200303_ENTACT_RP_MIX508; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 2935; ORIGINAL_PRECURSOR_SCAN_NO 2934 CONFIDENCE standard compound; INTERNAL_ID 1340; DATASET 20200303_ENTACT_RP_MIX508; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 2902; ORIGINAL_PRECURSOR_SCAN_NO 2900 CONFIDENCE standard compound; INTERNAL_ID 1340; DATASET 20200303_ENTACT_RP_MIX508; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 2938; ORIGINAL_PRECURSOR_SCAN_NO 2937 CONFIDENCE standard compound; INTERNAL_ID 1340; DATASET 20200303_ENTACT_RP_MIX508; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 2922; ORIGINAL_PRECURSOR_SCAN_NO 2921 CONFIDENCE standard compound; INTERNAL_ID 1340; DATASET 20200303_ENTACT_RP_MIX508; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 2945; ORIGINAL_PRECURSOR_SCAN_NO 2944 CONFIDENCE standard compound; INTERNAL_ID 1340; DATASET 20200303_ENTACT_RP_MIX508; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 2892; ORIGINAL_PRECURSOR_SCAN_NO 2890 KEIO_ID N012
2-Aminonicotinic acid
2-Aminonicotinic acid belongs to the class of organic compounds known as pyridinecarboxylic acids. These are compounds containing a pyridine ring bearing a carboxylic acid group.
5-Oxo-2(5H)-isoxazolepropanenitrile
5-Oxo-2(5H)-isoxazolepropanenitrile is found in pulses. 5-Oxo-2(5H)-isoxazolepropanenitrile is a constituent of Pisum sativum (peas) Constituent of Pisum sativum (peas). 5-Oxo-2(5H)-isoxazolepropanenitrile is found in pulses and common pea.
Benzyl methyl sulfide
Benzyl methyl sulfide is found in animal foods. Benzyl methyl sulfide is a flavouring agent. Benzyl methyl sulfide is present in cooked por Benzyl methyl sulfide is a flavouring agent. It is found in animal foods, specifically cooked pork.
Nicotinamide N-oxide
Nicotinamide N-oxide is recognized as an in vivo metabolite of nicotinamide which is a precurser of nicotinamide-adenine dinucleotide (NAD+) in animals. The enzyme that catalyses the reduction of nicotinamide N-oxide to nicotinamide in liver is xanthine oxidase. [HMDB] Nicotinamide N-oxide is recognized as an in vivo metabolite of nicotinamide which is a precurser of nicotinamide-adenine dinucleotide (NAD+) in animals. The enzyme that catalyses the reduction of nicotinamide N-oxide to nicotinamide in liver is xanthine oxidase. Nicotinamide N-oxide, an in vivo nicotinamide metabolite, is a potent, and selective antagonist of the CXCR2 receptor. Nicotinamide N-oxide, an in vivo nicotinamide metabolite, is a potent, and selective antagonist of the CXCR2 receptor.
8-Hydroxypurine
8-Hydroxypurine, the C(8)-oxidized purine bases, has been detected in neoplastic liver of fish, as well as in urine samples of humans.(PMID: 2519715). 8-Hydroxypurine derivatives have been reported to have a wide range of biological activities, such as corticotropin-releasing hormone receptor antagonism,anti-rhinovirus activity,xanthine oxidase inhibiting activity and excellent binding affinity to a benzodiazepine receptor. 8-Hydroxypurine, the C(8)-oxidized purine bases, has been detected in neoplastic liver of fish, as well as in urine samples of humans.(PMID: 2519715)
2,6-Dimethylbenzenethiol
2,6-Dimethylbenzenethiol is found in animal foods. 2,6-Dimethylbenzenethiol is present in boiled beef. 2,6-Dimethylbenzenethiol is a flavouring ingredien Present in boiled beef. Flavouring ingredient. 2,6-Dimethylbenzenethiol is found in animal foods.
(+/-)-1-Phenylethylmercaptan
(+/-)-1-Phenylethylmercaptan is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")
2-Ethylbenzenethiol
2-Ethylbenzenethiol is a flavouring ingredient especially for instant coffee. Flavouring ingredient especies for instant coffee
Trans-urocanate
Trans-urocanate is also known as (e)-3-(Imidazol-4-yl)propenoate or trans-Urocanic acid. Trans-urocanate is considered to be soluble (in water) and acidic
Urocanic acid
An alpha,beta-unsaturated monocarboxylic acid that is prop-2-enoic acid substituted by a 1H-imidazol-4-yl group at position 3. It is a metabolite of hidtidine. Urocanic acid is an intermediate in the catabolism of L-histidine.; Urocanic is a breakdown (deamination) product of histidine. In the liver, urocanic acid is an intermediate in the conversion of histidine to glutamic acid, whereas in the epidermis, it accumulates and may be both a UV protectant and an immunoregulator. Urocanic acid (UA) exists as a trans isomer (t-UA, approximately 30 mg/cm2) in the uppermost layer of the skin (stratum corneum). t-UA is formed as the cells of the second layer of skin become metabolically inactive. During this process, proteins and membranes degrade, histidine is released, and histidase (histidine ammonia lyase) catalyzes the deamination of histidine to form t-UA. t-UA accumulates in the epidermis until removal by either the monthly skin renewal cycle or sweat. Upon absorption of UV light, the naturally occurring t-UA isomerizes to its cis form, c-UA. Because DNA lesions (e.g., pyrimidine dimers) in the lower epidermis can result from UV-B absorption, initial research proposed that t-UA acted as a natural sunscreen absorbing UV-B in the stratum corneum before the damaging rays could penetrate into lower epidermal zones. Researchers have found that c-UA also suppresses contact hypersensitivity and delayed hypersensitivity, reduces the Langerhans cell count in the epidermis, prolongs skin-graft survival time, and affects natural killer cell activity. Urocanic acid is found in mung bean. C308 - Immunotherapeutic Agent relative retention time with respect to 9-anthracene Carboxylic Acid is 0.055 relative retention time with respect to 9-anthracene Carboxylic Acid is 0.054 relative retention time with respect to 9-anthracene Carboxylic Acid is 0.053 relative retention time with respect to 9-anthracene Carboxylic Acid is 0.052 Urocanic acid, produced in the upper layers of mammalian skin, is a major absorber of ultraviolet radiation (UVR). Urocanic acid, produced in the upper layers of mammalian skin, is a major absorber of ultraviolet radiation (UVR).
4-aminonicotinic acid
An aminonicotinic acid in which the amino group is situated at position 4 of the pyridine ring.
5-Ammonionicotinate
An aminonicotinic acid in which the amino group is situated at position 5 of the pyridine ring.
2-NITROANILINE
CONFIDENCE standard compound; INTERNAL_ID 806; DATASET 20200303_ENTACT_RP_MIX505; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 3817; ORIGINAL_PRECURSOR_SCAN_NO 3816 CONFIDENCE standard compound; INTERNAL_ID 806; DATASET 20200303_ENTACT_RP_MIX505; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 3818; ORIGINAL_PRECURSOR_SCAN_NO 3817 CONFIDENCE standard compound; INTERNAL_ID 806; DATASET 20200303_ENTACT_RP_MIX505; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 3826; ORIGINAL_PRECURSOR_SCAN_NO 3825 CONFIDENCE standard compound; INTERNAL_ID 806; DATASET 20200303_ENTACT_RP_MIX505; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 3823; ORIGINAL_PRECURSOR_SCAN_NO 3822 CONFIDENCE standard compound; INTERNAL_ID 806; DATASET 20200303_ENTACT_RP_MIX505; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 3891; ORIGINAL_PRECURSOR_SCAN_NO 3890 CONFIDENCE standard compound; INTERNAL_ID 806; DATASET 20200303_ENTACT_RP_MIX505; DATA_PROCESSING MERGING RMBmix ver. 0.2.7; DATA_PROCESSING PRESCREENING Shinyscreen ver. 0.8.0; ORIGINAL_ACQUISITION_NO 3829; ORIGINAL_PRECURSOR_SCAN_NO 3828
1-Undecene-3,5,7,9-tetrayne|undec-1-ene-3,5,7,9-tetrayne|Undeca-1-en-3,5,7,9-tetrain
Methyl 2-pyrazinecarboxylate
CONFIDENCE standard compound; INTERNAL_ID 8364
trans-Urocanic acid
A urocanic acid in which the double bond of the carboxyethene moiety has E configuration. Isol from fungi, e.g. Coprinus atramentarius (common ink cap) and Phallus impudicus (common stinkhorn). (E)-Urocanic acid is found in mushrooms.
Nicotinamide 1-oxide
Nicotinamide N-oxide, an in vivo nicotinamide metabolite, is a potent, and selective antagonist of the CXCR2 receptor. Nicotinamide N-oxide, an in vivo nicotinamide metabolite, is a potent, and selective antagonist of the CXCR2 receptor.
4-(4-METHYLPIPERAZINO)-3-NITROBENZENE-CARBOXYLIC ACID
6-Aminonicotinic acid
An aminonicotinic acid in which the amino group is situated at position 6 of the pyridine ring. 6-Aminonicotinic acid is a GABAA receptor agonist with Ki value of 4.4 nM[1].
TeMozoloMide Related CoMpound A,4-diazo-4H-iMidazole-5-carboxaMide
Propanoic acid, 3-fluoro-2-(fluoromethyl)-2-methyl-
N-Methylnicotinic acid
A pyridinium ion consisting of nicotinic acid having a methyl substituent on the pyridine nitrogen.
2-Aminonicotinic acid
An aminonicotinic acid in which the amino group is situated at position 2 of the pyridine ring.
Nicotinamide N-oxide
Nicotinamide N-oxide, an in vivo nicotinamide metabolite, is a potent, and selective antagonist of the CXCR2 receptor. Nicotinamide N-oxide, an in vivo nicotinamide metabolite, is a potent, and selective antagonist of the CXCR2 receptor.
Cis-urocanic acid
A urocanic acid in which the double bond of the carboxyethene moiety has Z configuration. C308 - Immunotherapeutic Agent
4-carboxyanilinium
A primary ammonium ion that is the conjugate acid of 4-aminobenzoic acid resulting from the protonation of the amino group.
