Czerwień metylowa

Czerwień metylowa
Ilustracja
Ogólne informacje
Wzór sumaryczny

C15H15N3O2

Inne wzory

(CH3)2NC6H4N=NC6H4COOH

Masa molowa

269,30 g/mol

Wygląd

ciemnoczerwony proszek lub fioletowe kryształy[1]

Identyfikacja
Numer CAS

493-52-7
845-10-3 (sól sodowa)

PubChem

10303

DrugBank

DB08209

Podobne związki
Podobne związki

oranż metylowy

Jeżeli nie podano inaczej, dane dotyczą
stanu standardowego (25 °C, 1000 hPa)
Multimedia w Wikimedia Commons

Czerwień metylowa (DABCYL, z ang. 2-(N,N-Dimethyl-4-aminophenyl)azobenzenecarboxylic acid[6]) – organiczny związek chemiczny, barwnik azowy stosowany najczęściej jako chemiczny wskaźnik pH. W temperaturze pokojowej jest to ciemnoczerwone, krystaliczne ciało stałe.

Czerwień metylowa[2]
pH < 4,8 ⇄ pH > 6,0

Zmienia barwę od ciemnoczerwonej do jasnożółtej w zakresie pH od 4,8 do 6,0. Czerwień metylowa, podobnie jak oranż metylowy jest stosowana w alkacymetrii. Oprócz tego stosuje się ją w mikrobiologii do detekcji zmiany pH zachodzącej w czasie fermentacji glukozy.

Zobacz też

Przypisy

  1. ↑ a b c Farmakopea Polska X, Polskie Towarzystwo Farmaceutyczne, Warszawa: Urząd Rejestracji Produktów Leczniczych, Wyrobów Medycznych i Produktów Biobójczych, 2014, s. 4276, ISBN 978-83-63724-47-4.
  2. ↑ a b A.K. Covington: Acid-base indicators. W: CRC Handbook of Chemistry and Physics. Wyd. 88. Boca Raton: CRC Press, 2008, s. 8-15–8-17.
  3. ↑ a b Methyl red, [w:] PubChem [online], United States National Library of Medicine, CID: 10303 [dostęp 2024-04-03] (ang.).
  4. ↑ O-Methyl red, [w:] ChemIDplus [online], United States National Library of Medicine [dostęp 2012-07-17] (ang.).
  5. ↑ Czerwień metylowa (nr 32654) – karta charakterystyki produktu Sigma-Aldrich (Merck) na obszar Polski.
  6. ↑ Gunnlaugsson, Thorfinnur, Kelly, John M., Nieuwenhuyzen, Mark, O’Brien, Aoife M.K. Synthesis and characterisation of novel 3'-O- and 5'-O-modified azobenzene-thymidine phosphoramidites and their oligonucleotide conjugates as colorimeter DNA probes and FRET quenchers. „Tetrahedron Letters”. 44 (47), s. 8571–8575, 2003. DOI: 10.1016/j.tetlet.2003.09.115. 

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