Clemastanin B 

Clemastanin B, a lignin, has potent anti-influenza activities by inhibiting the virus multiplication, prophylaxsis and blocking the virus attachment. Clemastanin B targets viral endocytosis, uncoating or ribonucleoprotein (RNP) export from the nucleus. Clemastanin B has antioxidant and anti-inflammatory activities^[1][2][3].

Clemastanin B inhibits different subtypes of human (H1N1, including swine-origin H1N1; H3N2 and influenza B) and avian influenza viruses (H6N2, H7N3, H9N2) at different magnitudes of activity (IC₅₀ 0.087-0.72 mg/ml) while this compound was inactive against respiratory syncytial virus (RSV), adenovirus 3 (ADV3), parainfluenza virus 3 (PIV3), enterovirus 71 (EV71) and human rhinovirus (HRV)^[1].
Clemastanin B (0.05, 0.1, 0.2, 0.4 mg/ml; for 8 hours) treatment results in nucleoprotein (NP) distribution in the nuclei in MDCK cells^[1].
Clemastanin B (48-72 h) after virus incubation (MOI, 0.01; for 2 h) causes a pronounced titer reduction of progeny virus in MDCK cells^[1].
Clemastanin B (pre-incubated for 2 h) has no protective effect on MDCK cell lines with influenza virus^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

684.68

C₃₂H₄₄O₁₆

112747-98-5

Solid

White to light yellow

OC[C@@H]1[C@](C2=CC(OC)=C(C=C2)O[C@@H]3O[C@@H]([C@H]([C@@H]([C@H]3O)O)O)CO)([H])OC[C@@H]1CC4=CC(OC)=C(C=C4)O[C@@H]5O[C@@H]([C@H]([C@@H]([C@H]5O)O)O)CO

Room temperature in continental US; may vary elsewhere.

4°C, protect from light

*In solvent : -80°C, 6 months; -20°C, 1 month (protect from light)

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (protect from light). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

• [1]. Zifeng Yang, et al. Antiviral activity of Isatis indigotica root-derived clemastanin B against human and avian influenza A and B viruses in vitro. Int J Mol Med. 2013 Apr;31(4):867-73.  [Content Brief]

  [2]. Ping Xiao, et al. Antiviral activities against influenza virus (FM1) of bioactive fractions and representative compounds extracted from Banlangen (Radix Isatidis). J Tradit Chin Med. 2016 Jun;36(3):369-76.  [Content Brief]

  [3]. Ping Xiao, et al. In vitro antioxidant and anti-inflammatory activities of Radix Isatidis extract and bioaccessibility of six bioactive compounds after simulated gastro-intestinal digestion. J Ethnopharmacol. 2014 Nov 18;157:55-61.  [Content Brief]