The present invention provides a polythiol composition containing, as the main component, a polythiol compound (a) having two or more mercapto groups, and containing 0.5% by mass or less of a nitrogen-containing compound (b) in which at least one mercapto group in the polythiol compound (a) is substituted with a group represented by formula (1).

##STR00001##

The present invention provides a polythiol composition containing, as the main component, a polythiol compound (a) having two or more mercapto groups, and containing 0.5% by mass or less of a nitrogen-containing compound (b) in which at least one mercapto group in the polythiol compound (a) is substituted with a group represented by formula (1).

##STR00001##

The present invention relates to a novel use of magnetic iron oxide red Fe.sub.21.333O.sub.32 as a catalyst in oxidizing methanthiol to prepare dimethyl disulfide. The magnetic iron oxide red Fe.sub.21.333O.sub.32 according to the present invention has extremely high catalytic selectivity in catalyzing and oxidizing methanthiol to prepare dimethyl disulfide. The magnetic iron oxide red Fe.sub.21.333O.sub.32 is prepared with a carbonate and a ferrite as raw materials, has advantages of low cost and simple preparation process, and is suitable for industrial production.

The present invention relates to a novel use of magnetic iron oxide red Fe.sub.21.333O.sub.32 as a catalyst in oxidizing methanthiol to prepare dimethyl disulfide. The magnetic iron oxide red Fe.sub.21.333O.sub.32 according to the present invention has extremely high catalytic selectivity in catalyzing and oxidizing methanthiol to prepare dimethyl disulfide. The magnetic iron oxide red Fe.sub.21.333O.sub.32 is prepared with a carbonate and a ferrite as raw materials, has advantages of low cost and simple preparation process, and is suitable for industrial production.

According to one embodiment, in producing polythiols in a manner similar to a conventional method, a polythiol having improved storage stability may be produced in a convenient manner by adjusting reaction conditions so as to prevent thiourea from remaining within products. In particular, the equivalent weight of thiourea to be used in a reaction may be adjusted to a predetermined range, thereby reducing the amount of unreacted thiourea, and thiourea may be removed once more in a sub sequent process, thereby effectively removing remaining thiourea while achieving a high yield. The polythiol thus produced does not contain residual thiourea, and thus does not show discoloration or cloudiness caused by precipitates even under prolonged storage or high-temperature conditions.

According to one embodiment, in producing polythiols in a manner similar to a conventional method, a polythiol having improved storage stability may be produced in a convenient manner by adjusting reaction conditions so as to prevent thiourea from remaining within products. In particular, the equivalent weight of thiourea to be used in a reaction may be adjusted to a predetermined range, thereby reducing the amount of unreacted thiourea, and thiourea may be removed once more in a sub sequent process, thereby effectively removing remaining thiourea while achieving a high yield. The polythiol thus produced does not contain residual thiourea, and thus does not show discoloration or cloudiness caused by precipitates even under prolonged storage or high-temperature conditions.

Composition and methods for treating infectious and inflammatory diseases using saccharide based products and therapies. Products can be implemented as a nutritional supplement, a food, a feed, a food additive, a feed additive, a therapeutic product, a rehydration salt, or a rehydration solution. The present disclosure relates generally to the fields of compositions and products containing the compositions, and the use of the compositions or the products for preventing and/or treating infectious or inflammatory diseases or conditions in particular gastrointestinal and respiratory diseases (diarrhea and influenza infections) or inflammatory.

Composition and methods for treating infectious and inflammatory diseases using saccharide based products and therapies. Products can be implemented as a nutritional supplement, a food, a feed, a food additive, a feed additive, a therapeutic product, a rehydration salt, or a rehydration solution. The present disclosure relates generally to the fields of compositions and products containing the compositions, and the use of the compositions or the products for preventing and/or treating infectious or inflammatory diseases or conditions in particular gastrointestinal and respiratory diseases (diarrhea and influenza infections) or inflammatory.

Modular dendrimers with cationic groups and lipophilic groups are provided herein. In some aspects, the dendrimers provided herein may be formulated in compositions which contain a nucleic acid and one or more helper excipients. In some aspects, these compositions may also be used to treat diseases or disorders with a therapeutic nucleic acid.

Modular dendrimers with cationic groups and lipophilic groups are provided herein. In some aspects, the dendrimers provided herein may be formulated in compositions which contain a nucleic acid and one or more helper excipients. In some aspects, these compositions may also be used to treat diseases or disorders with a therapeutic nucleic acid.