Quercetin 3-O-(6''-O-malonyl)-β-D-glucosideはフラボノール配糖体の誘導体であり、ケルセチンのアシル化配糖体である[1]。Quercetin 3-O-(6''-O-malonyl)-β-D-glucosideは無細胞の環境で、優れた抗酸化活性を持つが、生物系で同様の保護作用を発揮しない[2, 3]。Quercetin 3-O-(6''-O-malonyl)-β-D-glucosideは主にマメ科植物（例えば大豆やアルファルファなど）と一部の薬用植物で主に発見される[4]。
References:
[1] Petrova N V, Chernonosov A A, Koval V V, et al. LC–HRMS for the identification of quercetin and its derivatives in Spiraea hypericifolia (Rosaceae) and anatomical features of its leaves[J]. Plants, 2023, 12(2): 381.
[2] Panat N A, Amrute B K, Bhattu S, et al. Antioxidant Profiling of C3 Quercetin Glycosides: Quercitrin, Quercetin 3-β-D-glucoside and Quercetin 3-O-(6”-O-malonyl)-β-Dglucoside in cell free environment[J]. Free Radicals and Antioxidants, 2015, 5(2): 90-100.
[3] Alizadeh S R, Ebrahimzadeh M A. O‐Glycoside quercetin derivatives: Biological activities, mechanisms of action, and structure–activity relationship for drug design, a review[J]. Phytotherapy Research, 2022, 36(2): 778-807.
[4] Zhang Q, Zhao X, Qiu H. Flavones and flavonols: Phytochemistry and biochemistry[M]//Natural products. Springer, Berlin, Heidelberg, 2013: 1821-1847.