Table 1.

The considered solvents for the preparation of extracts from different parts of the walnut tree and its fruit.

No	Solvent		Part	References
1	Water	Fruit	Kernel	[28,69,70,136,137,138,139]
			Shell	[56], [140]25, [141]25
			Husk	[18,56,73,103,142,143]
		Other parts	Leaf	[78]25, [109], [144]24, [145,146], [147]25, [148,149], [150]28
			Bark	[128], [151]32, [152,153]
			Stem	[148]
2	Ethanol	Fruit	Kernel	[28]9, [137], [154]16, [155]11, [156]11, [157]4, [158]34
			Skin	[154]16, [159]35
			Shell	[24]4, [140,141], [158]34
			Husk	[18], [103]4, [142], [158]34, [160]6, [161], [162]4
		Other parts	Leaf	[104]30, [110]6, [145], [149], [158]34, [162]4, [163]31, [164]22, [165]23, [166]22, [167]26, [168,169], [170]20, [171,172], [173]6
			Bark	[128,151], [174]2
			Stem	[158]34
			Root	[21]
3	Methanol	Fruit	Kernel	[27,66,67,131,132,133,134,135,138], [154]17, [175], [176]12, [177], [178]12, [179]14, [180]15, [181]12, [182]
			Skin	[66,67], [154]16
			Shell	[56,67,140,141,183]
			Husk	[18,56,67,71], [103]5, [131,182], [184,185],
		Other parts	Leaf	[77,112,131,145,146,148,165,185,186], [187]27, [188,189,190,191], [192]21, [193,194]
			Shoot	[80], [81]37, [82]37
			Bark	[124,151,152,195,196], [197]33, [198]3
			Stem	[148]
			Root	[129]
4	Ethyl acetate	Fruit	Kernel	[70]
			Shell	[56,140,141]
			Husk	[18,56,142]
		Other parts	Leaf	[165]
			Bark	[124,152,195]
			Root	[129]
5	Acetone	Fruit	Kernel	[16]18, [25]10, [46]18, [138], [199]8, [200]13, [201]7, [202]19,
			Shell	[183]
			Husk	[18], [102]7, [203]7
		Other parts	Leaf	[145,204]
			Bark	[124]1, [151], [152]1, [153], [195]8
6	Hexane	Fruit	Husk	[18]
		Other parts	Leaf	[165], [205]29
			Bark	[196]
			Root	[129]
7	Dichloromethane	Fruit	Shell	[56]
			Husk	[56]
8	Petroleum ether	Fruit	Kernel	[70,131]
			Husk	[131,142]
		Other parts	Leaf	[131]
			Bark	[151]
9	Chloroform	Fruit	Shell	[140,141]
			Husk	[142]
		Other parts	Leaf	[79,165]
			Bark	[151,196]
10	n-Butanol	Fruit	Kernel	[68,70]
			Shell	[140,141]
11	Benzene	Other parts	Leaf	[145]
			Bark	[151]
12	Cyclohexane	Other parts	Leaf	[171]

¹ in diluted form; ² 80% (400 mL ethanol 96% + 100 mL water); ³ 70% aqueous acetone; ⁴ 50% aqueous ethanol; ⁵ 50% aqueous methanol; ⁶ 70% ethanol; ⁷ acetone/water (v/v, 70/30); ⁸ acetone:water (80:20; v/v); ⁹ 96%; ¹⁰ chilled 80% acetone (1:8, w/w); ¹¹ ethanol:water (4:1, v/v); ¹² methanol:water (70:30); ¹³ acetone:water (60:40; v/v); ¹⁴ 80% methanol (1:2 w/v, 3×); ¹⁵ methanol/water (60:40, v/v); ¹⁶ ethanol/water (7:3, v/v); ¹⁷ methanol/water (6:4, v/v); ¹⁸ 75% acetone + 25% of 526 µmol/L sodium metabisulfite; ¹⁹ 100 mM acetate buffer, pH 4.8/acetone (30:70, v/v); ²⁰ hydroethanolic (20 to 70% v/v); ²¹ 80% methanol (v/v); ²² 80% ethanol; ²³ ethanol:water (80:20); ²⁴ acidified water (pH 2 with HCl); ²⁵ boiling water; ²⁶ 60% ethanol; ²⁷ 60% methanol; ²⁸ 20% water (w/w) and choline chloride with butyric or phenylpropionic acid (mole ratio 1:2); ²⁹ 95% hexane; ³⁰ 61% ethanol; ³¹ ethanol:water (4:6); ³² distilled water; ³³ 99.5% methanol; ³⁴ 95% ethanol (v/v); ³⁵ ethanol:water (4:6); ³⁶ 50 or 70% ethanol; ³⁷ 80% methanol.