Particulate composition comprising crystalline alpha, alpha-trehalose dihydrate, its preparation and uses
An object of the present invention is to provide a particulate composition containing crystalline α,α-trehalose dihydrate, having an advantageous emulsifying ability. The above object is solved by providing a particulate composition comprising crystalline α,α-trehalose dihydrate, which consists of particles containing α,α-trehalose and maltose and/or maltotriose, wherein said particulate composition contains α,α-trehalose in an amount of 70% by weight or higher but 90% by weight or lower, on a dry solid basis; and maltose and/or maltotriose in a total amount of 3% by weight or higher, on a dry solid basis; and has a degree of crystallinity for crystalline α,α-trehalose dihydrate of 25% or higher but less than 90%, when calculated based on its powder X-ray diffraction profile.
1. A particulate composition comprising crystalline α,α-trehalose dihydrate, which consists of particles containing α,α-trehalose and maltose and/or maltotriose, and has the following characteristics (1) to (3):
(1) comprising α,α-trehalose in an amount of 70% by weight or higher but 90% by weight or lower, on a dry solid basis;
(2) comprising maltose and/or maltotriose in a total amount of 3% by weight or higher, on a dry solid basis; and
(3) having a degree of crystallinity for crystalline α,α-trehalose dihydrate of 25% or higher but less than 90%, when calculated based on its powder X-ray diffraction profile.
2. The particulate composition of claim 1 , which has the following characteristic (4):
(4) having a specific surface area of 0.25 m 2 /g or higher when determined by the gas adsorption isotherms using nitrogen.
3. The particulate composition of claim 1 , which has the following characteristic (5):
(5) containing particles with a particle size of at least 53 μm but smaller than 300 μm in an amount of 50% by weight or higher based on the particulate composition as a whole, and particles with a particle size of smaller than 53 μm in an amount of 10% by weight or higher based on the particulate composition as a whole.
4. The particulate composition of claim 1 , which has the following characteristic (6):
(6) the turbidity at 720 nm of the emulsion is 0.35 or higher, when an emulsion is prepared by the steps of mixing five parts by weight of said particulate composition and one part by weight of corn oil, admixing with 500 parts by weight of purified water, and stirring the mixture.
5. An emulsifier, comprising the particulate composition of claim 1 .
6. A process for producing the particulate composition of claim 1 , comprising the steps of:
preparing a saccharide solution containing α,α-trehalose in an amount of 70% by weight or higher but 90% by weight or lower, on a dry solid basis, and maltose and/or maltotriose in a total amount of 3% by weight or higher, on a dry solid basis;
spray-drying said saccharide solution to form particulate composition;
crystallizing α,α-trehalose to form crystalline α,α-trehalose dihydrate by aging the resulting particulate composition under a relative humidity of 60% or higher for 7 days or longer; and
drying the resulting particulate composition comprising crystalline α,α-trehalose dihydrate.
7. The process of claim 6 , wherein said step of preparing a saccharide solution containing α,α-trehalose in an amount of 70% by weight or higher but 90% by weight or lower, on a dry solid basis, and maltose and/or maltotriose in a total amount of 3% by weight or higher, on a dry solid basis, is conducted by allowing glycosyltrehalose-forming enzyme and trehalose-releasing enzyme to act on liquefied starch together with starch-debranching enzyme and cyclomaltodextrin glucanotransferase.
8. The process of claim 6 , wherein said step of spray-drying is conducted by using a rotary atomizer system.