Urobilin - wikipedia Urobilin Urobilin Names Other names Urochrome Identifiers CAS Number 1856 - 98 - 0 3D model ( JSmol ) Interactive image ChemSpider 4938471 ECHA InfoCard 100.015. 870 MeSH Urobilin PubChem CID 6433298 InChI InChI = 1S / C33H42N4O6 / c1 - 7 - 20 - 19 ( 6 ) 32 ( 42 ) 37 - 27 ( 20 ) 14 - 25 - 18 ( 5 ) 23 ( 10 - 12 - 31 ( 40 ) 41 ) 29 ( 35 - 25 ) 15 - 28 - 22 ( 9 - 11 - 30 ( 38 ) 39 ) 17 ( 4 ) 24 ( 34 - 28 ) 13 - 26 - 16 ( 3 ) 21 ( 8 - 2 ) 33 ( 43 ) 36 - 26 / h15, 26 - 27, 35H, 7 - 14H2, 1 - 6H3, ( H, 36, 43 ) ( H, 37, 42 ) ( H, 38, 39 ) ( H, 40, 41 ) / b28 - 15 - / t26 -, 27 - / m0 / s1 Key : KDCCOOGTVSRCHX - UYMYUHGCSA - N InChI = 1 / C33H42N4O6 / c1 - 7 - 20 - 19 ( 6 ) 32 ( 42 ) 37 - 27 ( 20 ) 14 - 25 - 18 ( 5 ) 23 ( 10 - 12 - 31 ( 40 ) 41 ) 29 ( 35 - 25 ) 15 - 28 - 22 ( 9 - 11 - 30 ( 38 ) 39 ) 17 ( 4 ) 24 ( 34 - 28 ) 13 - 26 - 16 ( 3 ) 21 ( 8 - 2 ) 33 ( 43 ) 36 - 26 / h15, 26 - 27, 35H, 7 - 14H2, 1 - 6H3, ( H, 36, 43 ) ( H, 37, 42 ) ( H, 38, 39 ) ( H, 40, 41 ) / b28 - 15 - / t26 -, 27 - / m0 / s1 Key : KDCCOOGTVSRCHX - UYMYUHGCBF SMILES O = C1 / C ( = C ( / CC ) ( C @ @ H ) ( N1 ) Cc2c ( c ( c ( n2 ) C = C3 / N = C ( C ( = C3CCC ( = O ) O ) C ) C ( C @ @ H ) / 4NC ( = O ) C ( = C 4C ) CC ) CCC ( = O ) O ) C ) C Properties Chemical formula Molar mass 590.72 g mol Except where otherwise noted, data are given for materials in their standard state ( at 25 ° C ( 77 ° F ), 100 kPa ). N verify ( what is ? ) Infobox references Urobilin or urochrome is the chemical primarily responsible for the yellow color of urine. It is a linear tetrapyrrole compound that, along with the related compound urobilinogen, are degradation products of the cyclic tetrapyrrole heme. Contents 1 Metabolism 2 Importance 3 See also 4 References Metabolism Urobilin is generated from the degradation of heme, which is first degraded through biliverdin to bilirubin. Bilirubin is then excreted as bile, which is further degraded by microbes present in the large intestine to urobilinogen. Some of this remains in the large intestine, and its conversion to stercobilin gives feces its brown color. Some is reabsorbed into the bloodstream, where it is oxidized to urobilin and eventually excreted by the kidneys, giving urine its yellow color. Importance Many urine tests ( urinalysis ) monitor the amount of urobilin in urine, as its levels can give insight on the effectiveness of urinary tract function. Normally, urine would appear as either light yellow urine or colorless. A lack of water intake, for example following sleep or dehydration, reduces the water content of urine, thereby concentrating urobilin and producing a darker color of urine. Obstructive jaundice reduces biliary bilirubin excretion, which is then excreted directly from the blood stream into the urine, giving a dark - colored urine but with a paradoxically low urobilin concentration, no urobilinogen, and usually with correspondingly pale faeces. Darker urine also results due to other chemicals, such as various ingested dietary components or drugs, porphyrins in porphyria, and homogentisate in patients with alcaptonuria. See also Bile pigment Bilirubin Biliverdin Heme Stercobilin References Jump up ^ Donald J. Voet ; Judith G. Voet ; Charlotte W. Pratt ( 2008 ). `` Synthesis and degradation of amino acids ''. Principles of Biochemistry, Third edition. Wiley. p. 778. ISBN 978 - 0470 - 23396 - 2. Voet and Voet Biochemistry Ed 3 page 1022 Nelson, L., David, Cox M.M.,. 2005. `` Chapter 22 - Biosynthesis of Amino Acids, Nucleotides, and Related Molecules '', pp. 856, In Lehninger Principles of Biochemistry. Freeman, New York. pp. 856 Bishop, Michael, Duben - Engelkirk, Janet L., and Fody, Edward P. `` Chapter 19, Liver Function, Clinical Chemistry Principles, Procedures, Correlations, 2nd Ed. '' Philadelphia : copyright 1992 J.B. Lippincott Company. Munson - Ringsrud, Karen and Jorgenson - Linné, Jean `` Urinalysis and Body Fluids, A ColorText and Atlas. '' St. Louis : copyright 1995 Mosby Types of tetrapyrroles Bilanes ( Linear ) Bilirubin Biliverdin Stercobilinogen Stercobilin Urobilinogen Urobilin Phytobilins Phytochromobilin Phycobilins Phycoerythrobilin Phycocyanobilin Phycourobilin Phycoviolobilin Macrocycle Corrinoids Methylcobalamin Adenosylcobalamin Cyanocobalamin Porphyrins Protoporphyrins Protoporphyrin IX Heme ( b, c, a, o ) Zinc protoporphyrin Magnesium protoporphyrin Phytoporphyrins Chlorophyll c Protochlorophyllide Reduced porphyrins Porphyrinogens Uroporphyrinogen ( I, III ) Coproporphyrinogen ( I, III ) Protoporphyrinogen IX Chlorins Chlorophyllide ( a, b ) Chlorophyll ( a, b ) Phaeophytin ( a, b ) Bacteriochlorophyll c Bacteriochlorins Bacteriochlorophyll a Isobacteriochlorins Siroheme Sirohydrochlorin Corphins Cofactor F430 Heme metabolic intermediates Porphyrin biosynthesis early mitochondrial : D - Aminolevulinic acid cytosolic : Porphobilinogen Hydroxymethylbilane Uroporphyrinogen III Coproporphyrinogen III late mitochondrial : Protoporphyrinogen IX Protoporphyrin IX Heme degradation and excretion Breakdown of heme spleen : Heme → Biliverdin → Bilirubin blood : Bilirubin + Albumin liver : Bilirubin diglucuronide Intestine, excretion in feces Stercobilinogen Stercobilin Urobilinogen Kidney, excretion in urine Urobilin Shades of yellow Amber Apricot Arylide yellow Aureolin Beige Buff Chartreuse Citrine Cream Dark goldenrod Ecru Flax Gold Gold ( metallic ) Goldenrod Harvest Gold Jasmine Jonquil Khaki Lemon chiffon Lion Maize Mikado yellow Mustard Naples yellow Navajo white Old gold Olive Papaya whip Saffron School bus yellow Selective yellow Stil de grain yellow Straw Sunglow Vanilla Yellow A typical sample is shown for each name ; a range of color - variations is commonly associated with each color - name. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Urobilin&oldid=761228710 '' Categories : Shades of yellow Biological pigments Tetrapyrroles Lactams Urine Hidden categories : Articles without EBI source Articles without KEGG source Articles without UNII source Articles with changed CASNo identifier ECHA InfoCard ID from Wikidata Articles containing unverified chemical infoboxes Chembox image size set Talk Contents About Wikipedia تۆرکجه Bosanski Cymraeg Deutsch Español فارسی Français Galego Hrvatski Italiano 日本 語 Plattdüütsch Русский Српски / srpski Srpskohrvatski / српскохрватски Svenska Edit links This page was last edited on 21 January 2017, at 19 : 23. About Wikipedia

Question: what is urochrome (also known as urobilin)
Answer: the chemical primarily responsible for the yellow color of urine