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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. 相似文献
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