Titrimetric and Polarographic Determination of Carminic Acid and its Quantification in Cochineal (Dactylopius coccus) Extracts

Autor:	Octavio Reyes-Salas, Marcos Juárez-Espino, José Manzanilla-Cano, Manuel Barceló-Quintal, Adela Reyes-Salas, Reyna Rendón-Osorio
Jazyk:	angličtina
Rok vydání:	2011
Předmět:	basic titration acid-basic titration acid cochineal extract Química polarography Carminic acid electrochemical determination
Zdroj:	Universidad Nacional Autónoma de México UNAM Redalyc-UNAM Journal of the Mexican Chemical Society (México) Num.2 Vol.55 Universidad Autónoma de Yucatán UAY Redalyc-UAY
Popis:	"The purity of synthetic carminic acid was quantified using potentiometric and conductimetric titrations, allowing its use as a secondary standard because there is not a primary one. Polarographic analysis (in ethanol-water 50:50, v/v) of carminic acid showed two reduction signals, each with a different number of electrons. The first reduction had more Nernstian behaviour and can be applied in analyses. Differential pulse polarography (DPP) produced a detection limit of 0.55 ¿g mL-1. The results indicate that DPP can be used to determine carminic acid content in cochineal extracts."
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::031a48c28b5f777083b3dca9850ef67e https://www.redalyc.org/articulo.oa?id=47521133005 Zobrazit plný text záznamu