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http://dx.doi.org/10.4333/KPS.2004.34.1.029

Solubility and Physicochemical Stability of Quercetin in Various Vehicles  

Gwak, Hye-Sun (College of Pharmacy, Chosun University)
Kim, Hye-Won (College of Pharmacology, Dongduk Women's University)
Chun, In-Koo (College of Pharmacology, Dongduk Women's University)
Publication Information
Journal of Pharmaceutical Investigation / v.34, no.1, 2004 , pp. 29-34 More about this Journal
Abstract
The solubility and stability of quercetin in various vehicles were determined. The solubility of quercetin at $28^{\circ}C$ increased in the rank order of isopropyl myristate < oleyl alcohol < propylene glycol monolaurate < oleoyl macrogol­6 glycerides < linoleoyl macrogol-6 glycerides < propylene glycol laurate (PGL) < propylene glycol monocaprylate (PGMC) < polyethylene glycol-8 glyceryl linoleate < caprylocaproyl macrogol-6 glycerides < diethylene glycol mono ethyl ether (DGME). The addition of DGME to non-aqueous vehicles such as PGL ad PGMC markedly increased the solubility of quercetin. From the stability studies, it was found that quercetin was unstable due to rapid oxidation by dissoved oxygen. The addition of a combination of ascorbic acid and edetic acid (EDTA) at 0.1 % markedly decreased the degradation rates of quercetin in 40% polyethylene glycol 400 in saline. Quercetin was relatively unstable in non-aqueous vehicles such as PGL and PGMC alone, and PGL-PGMC co-solvent The degradation of quercetin in such non-aqueous vehicles was fast, depending on temperature. The addition of butylated, hydroxytoluene, butylated hydroxyanisole, citric acid and/or EDTA at 0.1 % was effective in retarding the degradation of quercetin.
Keywords
Quercetin; Solubilty; Stability; Non-aqueous vehicles;
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