Vicine
Topic: Chemistry
From HandWiki - Reading time: 5 min
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| IUPAC name
2,6-Diamino-5-(β-D-glucopyranosyloxy)pyrimidin-4(1H)-one
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| Systematic IUPAC name
2,6-Diamino-5-{[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}pyrimidin-4(1H)-one | |
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3D model (JSmol)
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PubChem CID
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| Properties | |
| C10H16N4O7 | |
| Molar mass | 304.259 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
Vicine is an alkaloid glycoside found mainly in fava beans, which are also called broad beans (Vicia faba).[1] Vicine is toxic in individuals who have a hereditary loss of the enzyme glucose-6-phosphate dehydrogenase. It causes haemolytic anaemia, called favism. The formation of vicine in Vicia faba has been studied, but this natural formation has not yet been found.[2][3]
History
Vicine was initially isolated in 1870 from the seeds of Vicia sativa by a method of extraction with sulfuric acid and subsequent precipitation with mercury sulfate (HgSO4). Later vicine was also found in other Vicia species, namely Vicia faba, beet juice and peas. The chemical structure of the compound was built gradually. First the glycosidic nature of the compound was recognized in 1896. The same year the aglycone of vicine, divicine, was isolated. In the beginning of the 20th century the pyrimidine structure was recognized. Despite these initial successes, the correct formula of vicine was determined only in 1953 and it is 2,4-diamino-6-oxypyrimidine-5-(ß-d-glucopyranoside).[2]
Metabolism
Vicine is an inactive compound in the body. When vicine enters the body through food, it is hydrolysed by the intestinal microflora to a highly reactive free radical generating compound, the aglycone divicine.[2] Upon hydrolysis, the glucose part of the molecule is split off and that results in the reduced divicine. Divicine is then taken up in the blood through the intestinal epithelium.[4][5]
Adverse effects
Adverse effects almost solely occur in humans that suffer from glucose-6-phosphate dehydrogenase deficiency. This deficiency causes a shortage of glutathione in erythrocytes and glutathione is needed for the neutralization of ROS (reactive oxygen species) created by the strongly oxidizing agent divicine.[5] Glucose-6-phosphate dehydrogenase deficiency is a common genetic condition, with a global prevalence of approximately 4.9%, affecting over 400 million individuals worldwide.[5][6] It is important to recognize that glucose-6-phosphate dehydrogenase deficiency can still be life-threatening if not promptly diagnosed and managed. Effective management often includes interventions as blood transfusions, but with appropriate care, full recovery from favism without lasting complications is the expected outcome.[7]
Indications
Persons with G6PD deficiency are asymptomatic. An attack of acute haemolytic anaemia can appear out of nowhere and can be very severe and life-threatening. Indications of such a sudden attack of favism are dark urine, pallor, jaundice, abdominal pain and in most cases fever.[5]
Toxicity
The β-glycosidic bond between glucose and the hydroxyl group at C5 on the pyrimidine ring are hydrolysed to yield the aglycone of vicine, divicine (2,6-diamino-4,5-dihydroxypyrimidine).[8] These aglycones have a strong oxidising capacity for glutathione.[9] In healthy individuals, this is not a problem, as glutathione can be reduced quickly enough to regenerate it. In individuals with a deficiency for glucose 6-phosphate dehydrogenase (G6PD) however, this results in haemolytic anaemia.[10]
Effects on animals
A 10 g vicine /kg diet in laying hens led to reduced feed intake, egg weight, haemoglobin levels and fertility and increased liver weights, liver glutathione levels and plasma lipid levels. A diet with comparable levels of vicine per kg in pigs showed only small effects on protein and energy digestibility.[11]
In another study, laying and broiler hens were fed grains that were soaked for different periods of time, which partly or totally removed vicine. Hens that had had grains with vicine still in them showed a significant decrease in corpuscular haemoglobin, while the others did not.[12]
An in vivo study in rats showed that oral administration of vicine resulted in only small reductions in glutathione concentrations and no mortality. Intraperitoneal administration however, led to a rapid decrease in glutathione followed by death because of anoxia.[13]
References
- ↑ "Variability of Amino Acids, Protein, Vicine and Convicine in Vicia faba (L) Cultivars". Journal of Food Science 48 (3): 992–993. May 1983. doi:10.1111/j.1365-2621.1983.tb14950.x.
- ↑ 2.0 2.1 2.2 Mager, J.; Razin, A.; Herschko, A. (2012). "10. Favism". in Liener, I.. Toxic constituents of plant foodstuffs. Springer. pp. 293–312. ISBN 9780323147378. https://www.google.com.au/books/HsHi-_5QWdcC?&pg=PA293.
- ↑ Khazaei, Hamid (September 2019). "Eliminating vicine and convicine, the main anti-nutritional factors restricting faba bean usage". Trends in Food Science & Technology 91: 549–556. doi:10.1016/j.tifs.2019.07.051.
- ↑ "Mechanism of action of divicine in a cell-free system and in glucose-6-phosphate dehydrogenase-deficient red cells". Toxicologic Pathology 12 (4): 331–6. June 1984. doi:10.1177/019262338401200405. PMID 6099911.
- ↑ 5.0 5.1 5.2 5.3 "Favism and Glucose-6-Phosphate Dehydrogenase Deficiency". The New England Journal of Medicine 378 (1): 60–71. January 2018. doi:10.1056/NEJMra1708111. PMID 29298156.
- ↑ Khazaei, Hamid; Purves, Randy W.; Hughes, Jessa; Link, Wolfgang; O'Sullivan, Donal M.; Schulman, Alan H.; Björnsdotter, Emilie; Geu-Flores, Fernando et al. (2019-09-01). "Eliminating vicine and convicine, the main anti-nutritional factors restricting faba bean usage". Trends in Food Science & Technology 91: 549–556. doi:10.1016/j.tifs.2019.07.051. ISSN 0924-2244.
- ↑ Reading, N. Scott; Sirdah, Mahmoud M.; Shubair, Mohammad E.; Nelson, Benjamin E.; Al-Kahlout, Mustafa S.; Al-Tayeb, Jamal M.; Aboud, Lina N.; Shaban, Maysaa Abu et al. (2016-09-01). "Favism, the commonest form of severe hemolytic anemia in Palestinian children, varies in severity with three different variants of G6PD deficiency within the same community". Blood Cells, Molecules, and Diseases 60: 58–64. doi:10.1016/j.bcmd.2016.07.001. ISSN 1079-9796. PMID 27519946. https://www.sciencedirect.com/science/article/pii/S1079979616300821.
- ↑ "Degradation of vicine, convicine and their aglycones during fermentation of faba bean flour". Scientific Reports 6 (1): 32452. August 2016. doi:10.1038/srep32452. PMID 27578427. Bibcode: 2016NatSR...632452R.
- ↑ "Metabolic effects of pyrimidines derived from fava bean glycosides on human erythrocytes deficient in glucose-6-phosphate dehydrogenase". Biochemical and Biophysical Research Communications 20 (2): 235–40. July 1965. doi:10.1016/0006-291x(65)90352-9. PMID 5850686.
- ↑ "Determination and stability of divicine and isouramil produced by enzymatic hydrolysis of vicine and convicine of faba bean". Food Chemistry 212: 10–9. December 2016. doi:10.1016/j.foodchem.2016.05.077. PMID 27374500.
- ↑ "The use of grain legumes as a protein source in pig nutrition: A review". Animal Feed Science and Technology 157 (3–4): 111–128. May 2010. doi:10.1016/j.anifeedsci.2010.03.001.
- ↑ "Vicine and convicine in common vetch (Vicia sativa) seeds enhance beta-cyanoalanine toxicity in male broiler chicks". International Journal of Toxicology 21 (3): 201–9. June 2002. doi:10.1080/10915810290096333. PMID 12055021.
- ↑ "Effect of the antibiotic neomycin on the toxicity of the glycoside vicine in rats". Journal of Toxicology 2013: 913128. 2013. doi:10.1155/2013/913128. PMID 23840205.
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