Abstract: Provided is a novel compound that is contained in a young watermelon fruit and has an antioxidative effect. The novel compound that is contained in a young watermelon fruit and is represented by the formula (1) or formula (2) has an antioxidative effect and further has a skin anti-aging effect. Since these compounds are extracts from plants that are naturally edible, they are very safe for human bodies. Therefore, an antioxidative pharmaceutical composition, an antioxidative processed food composition, and an anti-skin aging composition, which contain these compounds as active ingredients, have high utility value as highly safe compositions.

Abstract: A method of suppressing the proliferation of virus comprises administering an antiviral agent comprising as an effective component at least one member selected from the group consisting of 5,7,4?-trihydroxy-3?,5?-dimethoxyflavone, 3-hydroxypyridine, p-hydroxybenzaldehyde and vanillin to one in need of suppressing of viral proliferation.

Abstract: A method for suppressing the growth of microorganism comprises the steps of providing a microbicidal agent comprising 5,7,4?-trihydroxy-3?,5?-dimethoxyflavone, and contacting the agent with the microorganism, wherein said microorganism is selected from the group consisting of Salmonella sp., and Pseudomonas aeruginosa.

Abstract: Provided is an antiviral agent with high antiviral activities and low side effects (cytotoxicity). Specifically provided is an antiviral agent comprising as an effective component at least one member selected from the group consisting of 5,7,4?-trihydroxy-3?,5?-dimethoxyflavone, 3-hydroxypyridine, p-hydroxybenzaldehyde and vanillin.

Abstract: A microbicidal agent comprising as an effective ingredient at least one selected from the group consisting of p-hydroxybenzaldehyde, 5,7,4?-trihydroxy-3?,5?-dimethoxyflavone, 3-hydroxypyridine and vanillin, and a microbicidal composition comprising the microbicidal agent.

Abstract: A process for preparing novel 1,3-selanazolin derivatives represented by chemical formula 1 at high yield.

Abstract: A selenating reagent obtained by reacting lithium aluminum hydride with selenium powder in an organic solvent. In addition, a method for preparing a selenating reagent includes reacting lithium aluminum hydride with selenium powder in an organic solvent. Also, a method of preparing a selenium-containing product includes reacting the selenating reagent, prepared as stated, with at least one second compound which may be acyl chloride.

Abstract: A selenating reagent obtained by reacting lithium aluminum hydride with selenium powder in an organic solvent.

Abstract: A process for preparing novel 1,3-selanazolin derivatives represented by chemical formula 1 at high yield. This process includes a step of reacting a selenourea and an &agr;-haloacyl halide in a solvent and in the presence of a catalyst.

Abstract: The present invention is a pharmaceutical composition used as an antiviral agent, a diarrheal remedy, an antiulcer agent, an anti-inflammatory agent, an anti-allergic agent and an agent for promoting the proliferation of Bifidobacteria, characterized by containing a sialic acid derivative as an active ingredient. The method for producing a sialic acid derivative of the present invention is characterized in that an almond or apricot seed is added to an avian egg yolk, by which the desired product can easily be obtained in a high yield.

Abstract: The present invention is directed to a method for producing crude sialic acid, comprising hydrolysis of a delipidated egg yolk and a method for producing high purity sialic acid, which comprises desalting a solution containing sialic acid obtainable by hydrolyzing a delipidated egg yolk, adsorbing sialic acid to an anion exchange resin and then eluting said sialic acid.The present invention makes it possible to produce and purify sialic acid from delipidated egg yolk on an industrial scale.