Aloe-emodin

Aloe-emodin

Aloe-emodin

【Structural formula】

[Molecular formula and molecular weight] C ₁₅ H ₁₀ O;; 270.

【Source】The dried roots and rhizomes of Rheum of ficinale Baill

【Properties】Orange needle-like crystals

Easily dissolves hot ethanol

Melting point: 224～225℃

【Purity Check】

TLC

1.

Developing solvent of chloroform - ethyl acetate - methanol (8:2:0.

Detect under sunlight and ultraviolet (366nm)

2.

Eluent petroleum ether (30 ~ 60 ℃) - ethyl - carboxylic acid (15:5:1, upper layer)

Detect under sunlight and ultraviolet (366nm)

High performance liquid chromatography

Chromatographic column Agilent SB C ₁₈ , 10um (4.

The mobile phase methanol - 0.

Detection wavelength 254nm

【Structural identification】429,287,254,225,202

3320(-OH), 1680(C=O), 1630(-Ar), 1450(-Ar), 1270(C—O), 750(C—H)

ESI-MS m/z: 271[Ｍ+H] ⁺ , 253[M+H-OH] ⁺ , 242[M+H-CO] ⁺ , 241[M+H-CHO] ⁺ , 213[Ｍ+H -2CO] ⁺ , 196[M+H-2CO-OH] ⁺

¹ H-NMR (C5D5N) δ: 4.

¹³ C-NMR (C ₅ D ₅ N) δ: 162.

【Storage】Dry, airtight and avoid light
.

Related link: Fangchinoline