A synthetic nicotine composition comprising synthetic nicotine, a synthetic nicotine salt and a synthetic nicotine derivative, wherein the synthetic nicotine, the synthetic nicotine salt, and the synthetic nicotine derivative are in mass percentage; the synthetic nicotine accounts for 1-20%, the synthetic nicotine salt accounts for 30-70%, and the synthetic nicotine derivative accounts for 20-50%; and the synthetic nicotine is one or more of S-nicotine and a mixture of R-nicotine containing a racemate and S-nicotine. The synthetic nicotine, synthetic nicotine salt and synthetic nicotine derivative according to the present invention are proportionally mixed to prepare an existing synthetic nicotine product, which relieves the problem of the impact of impurities in natural extracted nicotine products causing an unpleasant smell, a bitter taste and a strong volatility, and can be used in the fields of low temperature heat-not-burn products, snuff, electronic cigarettes, nicotine release patches, insecticides, herbicides, microbicides, drug synthesis, etc.

A synthetic nicotine composition comprising synthetic nicotine, a synthetic nicotine salt and a synthetic nicotine derivative, wherein the synthetic nicotine, the synthetic nicotine salt, and the synthetic nicotine derivative are in mass percentage; the synthetic nicotine accounts for 1-20%, the synthetic nicotine salt accounts for 30-70%, and the synthetic nicotine derivative accounts for 20-50%; and the synthetic nicotine is one or more of S-nicotine and a mixture of R-nicotine containing a racemate and S-nicotine. The synthetic nicotine, synthetic nicotine salt and synthetic nicotine derivative according to the present invention are proportionally mixed to prepare an existing synthetic nicotine product, which relieves the problem of the impact of impurities in natural extracted nicotine products causing an unpleasant smell, a bitter taste and a strong volatility, and can be used in the fields of low temperature heat-not-burn products, snuff, electronic cigarettes, nicotine release patches, insecticides, herbicides, microbicides, drug synthesis, etc.

The invention provides an artificially synthesized single sphingosine lipid and use of delivering a nucleic acid thereof. More particularly, the invention provides Use or method for delivering a nucleic acid to a cell or a subject using a compound of Formula (I), a stereoisomer or a pharmaceutical acceptable salt thereof, or a combination comprising a compound of Formula (I), a stereoisomer or a pharmaceutical acceptable salt thereof,

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The present invention relates to a method for preparing a composition comprising one or more omega-3 fatty acid salt(s), the composition obtainable or obtained by this method, and also the use of this composition for the preparation of foodstuffs, food supplements or pharmaceutical products.

The present invention relates to a method for preparing a composition comprising one or more omega-3 fatty acid salt(s), the composition obtainable or obtained by this method, and also the use of this composition for the preparation of foodstuffs, food supplements or pharmaceutical products.

The present disclosure discloses a quantum dot and a preparation method thereof, the method comprises a plurality of following steps: preparing a quantum dot solution; preparing an ion-containing organic ligand precursor; adding the ion-containing organic ligand precursor into the quantum dot solution, and making a surface-modification to the quantum dots, before obtaining the quantum dots having the surfaces modified; or providing a quantum dot solution; providing an ion-containing organic ligand precursor; mixing the ion-containing organic ligand precursor and the quantum dot solution, to make a ligand exchanging, before centrifuging and obtaining the quantum dots having the ligand exchanged.

The present invention provides purified compounds extracted from seaweeds having the formula (I):

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wherein R.sup.1 and R.sup.2 is each independently H or a fatty acid and their use for inhibiting the growth of cancer cells.

The present invention provides purified compounds extracted from seaweeds having the formula (I):

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wherein R.sup.1 and R.sup.2 is each independently H or a fatty acid and their use for inhibiting the growth of cancer cells.

Methods are provided for refining natural oil feedstocks. The methods comprise reacting the feedstock in the presence of a metathesis catalyst under conditions sufficient to form a metathesized product comprising olefins and esters. In certain embodiments, the methods further comprise separating the olefins from the esters in the metathesized product. In certain embodiments, the methods further comprise hydrogenating the olefins under conditions sufficient to form a fuel composition. In certain embodiments, the methods further comprise transesterifying the esters in the presence of an alcohol to form a transesterified product.

Methods are provided for refining natural oil feedstocks. The methods comprise reacting the feedstock in the presence of a metathesis catalyst under conditions sufficient to form a metathesized product comprising olefins and esters. In certain embodiments, the methods further comprise separating the olefins from the esters in the metathesized product. In certain embodiments, the methods further comprise hydrogenating the olefins under conditions sufficient to form a fuel composition. In certain embodiments, the methods further comprise transesterifying the esters in the presence of an alcohol to form a transesterified product.