Composition containing β-glucan, method of producing the same and foods, drinks or skin moisturizers containing the composition
It is intended to utilize β-glucan produced by a bacterium belonging to Aureobasidium sp. From a bacterium belonging to Aureobasidium sp., a mutant with little pigment accumulation is constructed by a mutagenesis means of, for example, irradiating with ultraviolet light or treating with a mutagen. A culture obtained by culturing this mutant in a liquid culture medium is usable as a composition with a large β-glucan content without showing any intense dark green color caused by the accumulation of melanin-like pigments. This composition may be taken as such as a functional food having the physiologically active functions of the β-glucan-containing composition. Alternatively, it may be added to foods, drinks. food additives, cosmetics and so on.
1. A biologically pure Aureobasidium pullulans strain FERM BP-10014.
2. A composition comprising the biologically pure strain of claim 1 that further comprises a liquid medium having a pH value of 4.5 to 6.0.
3. A composition comprising the biologically pure strain of claim 1 and a liquid medium having a pH value of 5.2 to 5.4 containing 1% sucrose, 0.2% ascorbic acid, and 0.2% rice polishings at a temperature of 20° C. to 30° C. under aeration.
4. A method for producing a cultured product containing a β-glucan content of 0.3% or more and/or having a viscosity of 39.3 mPa·s or more comprising:
culturing the biologically pure strain of claim 1 for a time and under conditions suitable for producing said cultured product; and
recovering the cultured product.
5. The method of claim 4 , further comprising:
adjusting the pH value of the recovered cultured product to less than 4.5 by addition of vitamin C and/or an organic acid; and
subjecting the cultured product to heat sterilization.
6. The method of claim 4 , wherein said biologically pure strain is cultured in a liquid medium at a pH ranging from 4.5 to 6.0.
7. The method of claim 4 , wherein said biologically pure strain is cultured at a temperature ranging from 20 to 30° C. with aeration.