Parietin
| Parietin | ||
|---|---|---|
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| IUPAC name 1,8-dihydroxy-6-methoxy-3-methyl-anthracene-9,10-dione | ||
| Systematic name 1,8-dihydroxy-3-methoxy-6-methylanthraquinone | ||
| Other names Physcion(e), rheochrysidin, methoxyemodin | ||
| Identifiers | ||
| CAS number | 521-61-9  | |
| PubChem | 10639 | |
| Jmol-3D images | Image 1 | |
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| Properties | ||
| Molecular formula | C16H12O5 | |
| Molar mass | 284.26348 g/mol | |
| Appearance | Orange/yellow | |
| Related compounds | ||
| Related compounds | Emodin | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| Infobox references | ||
Parietin is the predominant cortical pigment of lichens in the genus Caloplaca, a secondary product of the lichen Xanthoria parietina, and a pigment found in the roots of Curled Dock (Rumex crispus). It has an orangy-yellow color and absorbs blue light.
It reacts with KOH to form a deep, reddish-magenta compound.
It has also shown anti-fungal activity against barley powdery mildew and cucumber powdery mildew, more efficiently in the latter case than treatments with fenarimol and polyoxin B.
References
- Caloplaca coralloides chemistry
- Choi, Gyung Ja; Seon-Woo Lee, Kyoung Soo Jang, Jin-Seog Kim, Kwang Yun Cho and Jin-Cheol Kim (December 2004). "Effects of chrysophanol, parietin, and nepodin of Rumex crispus on barley and cucumber powdery mildews". Crop Protection 23 (12): 1215–1221. doi:10.1016/j.cropro.2004.05.005.
- Edwards, Howell G. M.; Emma M. Newton, David D. Wynn-Williams, and Steven R. Coombes (2003-03-12). "Molecular spectroscopic studies of lichen substances 1: parietin and emodin". Journal of Molecular Structure 648 (1–2): 49–59. doi:10.1016/S0022-2860(02)00384-8.
- Solhaug, Knut A.; Yngvar Gauslaa (November 1996). "Parietin, a photoprotective secondary product of the lichen Xanthoria parietina". Oecologia 108 (3): 412–418. doi:10.1007/BF00333715.
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