A fluorescent probe for sialidase activity detection, is a compound represented by the following general formula or a salt thereof.

##STR00001##

R.sub.1, if present, represents the same or different monovalent substituent present on a benzene ring. R.sub.2 and R.sub.3 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom. R.sub.4 and R.sub.5 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom. R.sub.6 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a fluorinated alkyl group having 1 to 5 carbon atoms. R.sub.6′ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R.sub.6′ may form, together with R.sub.3 or R.sub.5 a five to seven-membered heterocyclyl or heteroaryl containing a nitrogen atom to which R.sub.6′ is bonded.

A fluorescent probe for sialidase activity detection, is a compound represented by the following general formula or a salt thereof.

##STR00001##

R.sub.1, if present, represents the same or different monovalent substituent present on a benzene ring. R.sub.2 and R.sub.3 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom. R.sub.4 and R.sub.5 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom. R.sub.6 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a fluorinated alkyl group having 1 to 5 carbon atoms. R.sub.6′ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R.sub.6′ may form, together with R.sub.3 or R.sub.5 a five to seven-membered heterocyclyl or heteroaryl containing a nitrogen atom to which R.sub.6′ is bonded.

An olive storage and processing method. In one embodiment of the invention, harvested olives are stored in a storage tank in a storage solution containing water wherein the storage solution contains olive juices and salts. The storage solution with olive juices and salts is passed to a first ion exchange vessel having a strong acid ion exchange resin in hydrogen form at ambient temperature and pressure. Potassium and nitrogen ions and other cations are converted by the strong acid ion exchange resin and organic acids are released in order to create an acidic solution. The acidic solution is then returned to the storage tank for reuse as a storage solution.

The present invention has objects to provide a novel crystalline 2-O-α-D-glucosyl-L-ascorbic acid and method for producing the same. The present invention solves the above objects by providing crystalline potassium salt of 2-O-α-D-glucosyl-L-ascorbic acid and method for producing the same.

The present invention has objects to provide a novel crystalline 2-O-α-D-glucosyl-L-ascorbic acid and method for producing the same. The present invention solves the above objects by providing crystalline potassium salt of 2-O-α-D-glucosyl-L-ascorbic acid and method for producing the same.

A fluorescent probe is capable of detecting breast cancer, lung cancer, and squamous cell carcinoma. The fluorescent probe is also capable of detecting a benign tumor of a mammary gland. The fluorescent probe includes a compound represented by the following general formula or a salt thereof:

##STR00001##

A glycosyl donor represented by formula (I) is used for preparing an S-glycoside compound represented by formula (III), an O-glycoside compound represented by formula (V), and a C-glycoside compound represented by formula (V). The glycosyl donor is a raw material in the preparation of O-glycoside, S-glycoside, and C-glycoside compounds by means of a free radical reaction, most of which have a special α configuration.

The invention relates to a method for separating natural substance mixtures, in particular those consisting of plant extracts, and for isolating and purifying and obtaining same, by means of sequential centrifugal partition chromatography (sCPC).

The invention relates to a method for separating natural substance mixtures, in particular those consisting of plant extracts, and for isolating and purifying and obtaining same, by means of sequential centrifugal partition chromatography (sCPC).

The present specification relates to a whitening composition containing a novel quercetin-based compound isolated from post-fermented tea, an isomer thereof, a pharmaceutically acceptable salt thereof, a hydrate thereof, or a solvate thereof, wherein the whitening composition can be widely utilized in fields associated with skin whitening and skin care.