Metaniilkollane

Metaniilkollane ehk tropeoliin G (värvainete indeksis Acid Yellow 36) on monoasovärvaine, mida analüütilises keemias kasutatakse pH-indikaatorina happelistes keskkondades – ta muudab värvust punavioletsest kollaseks pH-vahemikus 1,2–2,3.

Metaniilkollase kasutamine toiduvärvina on keelatud, kuid näiteks Indias ja mujal Aasias kasutatakse seda erekollast pulbrit kurkumi lahjendamiseks^[1]^[2].

Loomkatsed on näidanud, et metaniilkollane on neurotoksiline^[3] ja hepatotoksiline.^[4]

Viited[muuda | muuda lähteteksti]

[1] S. Dhakal, K. Chao, W. Schmidt, J. Qin, M. Kim, and D. Chan. Evaluation of Turmeric Powder Adulterated with Metanil Yellow Using FT-Raman and FT-IR Spectroscopy. - Foods. 2016 Jun; 5(2): 36

[2] Common food adulterants in India", India Today, New Delhi, October 19, 2018

[3] T. N. Nagaraja, T. Desiraju. Effects of chronic consumption of metanil yellow by developing and adult rats on brain regional levels of noradrenaline, dopamine and serotonin, on acetylcholine esterase activity and on operant conditioning. - Food and Chemical Toxicology. 31 (1): 41–4. 1993

[4] B. Saxena, S. Sharma. Food Color Induced Hepatotoxicity in Swiss Albino Rats, Rattus norvegicus. - Toxicology International. 22 (1): 152–157. 2015

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