, 17:299

Vapor pressure and volatility of β-asarone, the main ingredient of an indigenous stored-product insecticide,Acorus calamus oil


  • M. streloke
    • FB Biologie, LG Zoologie-EntomologieUniversität Hannover
  • K. R. S. Ascher
    • FB Biologie, LG Zoologie-EntomologieUniversität Hannover
  • G. H. Schmidt
    • FB Biologie, LG Zoologie-EntomologieUniversität Hannover
  • W. P. Neumann
    • Abt. Chemie, Lehrstuhl für Organische Chemie IUniversitat Dortmund
Research Paper

DOI: 10.1007/BF02980759

Cite this article as:
streloke, M., Ascher, K.R.S., Schmidt, G.H. et al. Phytoparasitica (1989) 17: 299. doi:10.1007/BF02980759


The effect ofAcorus calamus products on insects is reviewed briefly. A sudden, dramatic drop occurs in the insecticidal, gaseous phase activity of calamus oil on stored-product pests, when the exposure temperature is lowered from 30° to 25°C. In an attempt to explain this finding, the vapor pressure of the main constituent of IndianAcorus calamus essential oil, β-asarone, was determined by three methods: (i) extrapolation with a gas-chromatographic method according to Jensen and Schall; (ii) calculation from boiling points with the Clausius-Clapeyron equation; and (iii) direct measurement with the Knudsen cell. The values of vapor pressure of β-asarone at 30°C according to these three methods were 3.3 x 10-3, 3.7 x 10-3 and 9.8 x 10-4 Torr, respectively. The volatility of β-asarone under the conditions of the fumigant experiments mentioned above was assayed by determining the weight loss from 50 mg asarone allowed to evaporate at 30°C from a filter paper disk into a 400 ml hermetically closed glass vessel. The weight loss was approximately 0.75 mg/400 ml receptacle space (≈1.9 mg/l) for every 10 days from day 0 to day 40.

Key Words

Acorus calamus oilβ-asarone, vapor pressure ofβ-asarone evaporation ofgas chromatography, retention timesClausius-Clapeyron equationKnudsen cellinsecticidal properties ofA. calamus products, literature minireview
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© Springer Science + Business Media B.V. 1989