In this paper, it is first confirmed using NMR method, that amino acids have one or more active groups which can react with Br2 in the oscillating reaction of amino acids. They are -NH2、 -OH、 -SH and heterocyclic gr...In this paper, it is first confirmed using NMR method, that amino acids have one or more active groups which can react with Br2 in the oscillating reaction of amino acids. They are -NH2、 -OH、 -SH and heterocyclic group of the amino acids. These active groups constitute the activation centre of the oscillating reaction. An important conclusion is that the activation centre controls the oscillating reaction and the oscllating lifetime.展开更多
By means of the reflux extracting and the systemic solvent separating method, the active parts were obtained from Euphorbia hylonoma Hand.-Mazz. Their bioactivity against armyworm, Leucania separata Walker, were deter...By means of the reflux extracting and the systemic solvent separating method, the active parts were obtained from Euphorbia hylonoma Hand.-Mazz. Their bioactivity against armyworm, Leucania separata Walker, were determined by the conventional leaf disk method. The results indicated that petroleum ether and benzene extracts had strong antifeeding property and killing function on the 3rd larvae of armyworm, their antifeeding rate and mortality of 72 h were 100.0%, 100.0% and 80.0%, 83.3% respectively, which means that the substances having bioactivity were non-polar. Four kinds of component were obtained from its benzene extracts by column chromatography, except No.4 extract, the antifeeding rate of others in 72 h were all over 50% in 0.1% concentration.展开更多
文摘In this paper, it is first confirmed using NMR method, that amino acids have one or more active groups which can react with Br2 in the oscillating reaction of amino acids. They are -NH2、 -OH、 -SH and heterocyclic group of the amino acids. These active groups constitute the activation centre of the oscillating reaction. An important conclusion is that the activation centre controls the oscillating reaction and the oscllating lifetime.
文摘By means of the reflux extracting and the systemic solvent separating method, the active parts were obtained from Euphorbia hylonoma Hand.-Mazz. Their bioactivity against armyworm, Leucania separata Walker, were determined by the conventional leaf disk method. The results indicated that petroleum ether and benzene extracts had strong antifeeding property and killing function on the 3rd larvae of armyworm, their antifeeding rate and mortality of 72 h were 100.0%, 100.0% and 80.0%, 83.3% respectively, which means that the substances having bioactivity were non-polar. Four kinds of component were obtained from its benzene extracts by column chromatography, except No.4 extract, the antifeeding rate of others in 72 h were all over 50% in 0.1% concentration.
