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Ramnoz

Ramnoz[1]
Adlandırmalar
IUPAC adı
6-Deoxy-L-mannopyranose
Diğer adlar
Isodulcit
α-L-Rhamnose
L-Rhamnose
L-Mannomethylose
α-L-Rha
α-L-Rhamnoside
α-L-Mannomethylose
6-Deoxy-L-mannose
L-Rhamnopyranose
Tanımlayıcılar
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.020.722 Bunu Vikiveri'de düzenleyin
KEGG
  • InChI=1/C6H12O5/c1-3(8)5(10)6(11)4(9)2-7/h2-6,8-11H,1H3/t3-,4-,5-,6-/m0/s1
  • O=C[C@H](O)[C@H](O)[C@@H](O)[C@@H](O)C
Özellikler
Molekül formülü C6H12O5
Yoğunluk 1.41 g/mL
Erime noktası 91 °C - 93 °C
Aksi belirtilmediği sürece madde verileri, Standart sıcaklık ve basınç koşullarında belirtilir (25 °C [77 °F], 100 kPa).
Bilgi kutusu kaynakları

Ramnoz, (Rha, Rham) doğal olarak oluşan bir deoksi şekerdir. Metilpentoz veya 6-deoksiheksoz olarak sınıflandırılabilir Ramnoz ağırlıklı olarak doğada L -formunda L -ramnoz (6-deoksi- L - mannoz) olarak bulunur. Bu olağandışı bir durumdur çünkü doğal olarak oluşan şekerlerin çoğu D -formundadır. İstisnaları, metil pentozlar, L - fukoz, L -ramnoz ve pentoz ve L - arabinozdur. Bununla birlikte, doğal olarak oluşan D-ramnoz örnekleri, Pseudomonas aeruginosa ve Helicobacter pylori gibi bazı bakteri türlerinde bulunur.[2]

Ramnoz; Cehri, zehirli sumak ve Uncaria cinsindeki bitkilerden izole edilebilir. Ramnoz ayrıca Bacillariophyceae sınıfına (Diyatome) ait mikroalgler tarafından da üretilir.[3]

Ramnoz genellikle doğada diğer şekerlere bağlanır. Birçok bitkiden elde edilen glikozitlerin ortak bir glikon bileşenidir. Ramnoz ayrıca, tüberküloza neden olan organizmayı içeren Mycobacterium cinsindeki aside dirençli bakterilerin dış hücre zarının bir bileşenidir.[4] L -ramnoza karşı doğal antikorlar insan serumunda mevcuttur,[5] ve insanların çoğunluğunun IgM, IgG veya bu glikana bağlanabilen bu tip immünoglobulinlerin her ikisine de sahip olduğu görülmektedir.[6]

Ramnozun bir özelliği visinal, diol bölünme reaksiyonunda periyodatlarla reaksiyona girdiğinde formaldehit üretiminin olmamasıdır. Bu, gliserol veya diğer visinal diol analizlerindeki fazla periyodatın çıkarılmasını çok faydalı kılar.[7]

Kaynakça

  1. ^ Merck Index, 11. baskı, 8171.
  2. ^ Melamed J, Kocev A, Torgov V, Veselovsky V, Brockhausen I (2022). "Biosynthesis of the Pseudomonas aeruginosa common polysaccharide antigen by D‐Rhamnosyltransferases WbpX and WbpY". Glycoconjugate Journal. doi:10.1007/s10719-022-10040-4. PMID 35166992. 
  3. ^ Brown, M. R. (1991). "The amino-acid and sugar composition of 16 species of microalgae used in mariculture". Journal of Experimental Marine Biology and Ecology. Cilt 145. s. 79. doi:10.1016/0022-0981(91)90007-J. 
  4. ^ Golan, David E., (Ed.) (2005). "Chapter 35 - Pharmacology of the Bacterial Cell Wall". Principles of Pharmacology: The Pathophysiologic Basis of Drug Therapy. Armen H. Tashjian Jr., Ehrin J. Armstrong, Joshua N. Galanter, April Wang Armstrong, Ramy A. Arnaout, Harris S. Rose. Lippincott Williams and Wilkins. s. 569. ISBN 0-7817-4678-7. 
  5. ^ Oyelaran O, McShane LM, Dodd L, Gildersleeve JC (2009). "Profiling Human Serum Antibodies with a Carbohydrate Antigen Microarray". J. Proteome Res. 8 (9). ss. 4301-10. doi:10.1021/pr900515y. PMC 2738755 $2. PMID 19624168. 
  6. ^ Wang X, Chen H, Chiodo F, Tefsen B (2019). "Detection of human IgM and IgG antibodies by means of galactofuranose-coated and rhamnose-coated gold nanoparticles". Matters. 19 Mayıs 2021 tarihinde kaynağından arşivlendi. Erişim tarihi: 3 Mayıs 2022. 
  7. ^ Ashworth, M. R. F., (Ed.) (1979). "Chapter 3". Analytical methods for glycerol. Academic Press. 

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