Table 8.
The quinones extracted from natural sources using ILs or IL solutions by different extraction techniques.
| Compounds | Types of ILs | Methods of Extraction | Sources | References |
|---|---|---|---|---|
| rhein (225), danthron (226), emodin (227), chrysophanol (228) | [Bmim]Cl, [Bmim]Br, [Bmim]BF4 | UAE, MAE | Rheum officinale Baill. | [155] |
| dihydrotanshinone (231), miltirone (232) | 1-octyl-3-methylimidazolium hexafluoro-phosphate | ultrahigh pressure extraction | Salvia miltiorrhiza Bunge | [159] |
| emodin (216), aloe-emodin (217), rhein (218), aloin (221) | [C4mim]BF4 | liquid–liquid extraction | Aloe vera L. | [160] |
| tashinone IIA (224) | (3-aminopropyl)trimethoxysilane, 1-octyl-3-methylimidazolium hexafluoro-phosphate | imprinted functionalized ionic liquid-modified silica, ultrahigh pressure extraction | Salvia miltiorrhiza Bunge | [159,161] |
| cryptotanshinone (222), tanshinone I (223) | (3-aminopropyl)trimethoxysilane | imprinted functionalized ionic liquid-modified silica | Salvia miltiorrhiza Bunge | [161] |
| chrysophanol (219), physcion (221) | 1-hexyl-3-methylimidazolium hexafluorophosphate | liquid–liquid micro extraction | Rheum officinale Baill | [162] |
| shikonin (229), β,β′-dimethylacrylshikonin (230) | [C6mim][PF6] | UMAE | Lithospermum erythrorhizon Sieb. et Zucc. | [163] |
| stibene glycoside (233) | [Bth][Br], [HBth][p-TSA] | liquid–liquid extraction | Fallopia multiflora (Thunb.) Harald. | [164] |