Calcium polyphosphate salt particles and method of making
View Patent ↗An equilibrium solution, such as a beverage product, containing a calcium salt of a sequestrant (such as calcium hexametaphosphate), coordinated compound of a calcium sequestrant and a sequestrant allows the delivery of bio-available calcium while maintaining the preservative qualities of the sequestrant (such as sodium hexametaphosphate). In one embodiment, the reaction of a salt such as calcium hydroxide and a sequestrant such as sodium potassium hexametaphosphate (sodium potassium polyphosphate) yields such an equilibrium solution in a beverage matrix. Calcium hexametaphosphate having a relatively short phosphate chain is disclosed, as well as the method of making that material, and beverage compositions containing the material together with a sequestrant preservative, such as SHMP.
1. A calcium polyphosphate salt having a calcium:polyphosphate molar ratio of from about 5:1 to about 9:1, and wherein the polyphosphate has a phosphorus chain length of from about 9 to about 16, in the form of particles having an average particle size of less than or equal to 0.5 μm.
2. The calcium polyphosphate salt according to claim 1 having an average particle size of from about 0.1 μm to about 0.3 μm.
3. The calcium polyphosphate salt according to claim 2 in the form of particles coated with hydrogenated phospholipid material.
4. The calcium polyphosphate salt according to claim 1 selected from the group consisting of calcium metaphosphate, calcium sodium metaphosphate, calcium sodium potassium metaphosphate, calcium sodium polyphosphate, and calcium sodium potassium polyphosphate.
5. The calcium polyphosphate salt according to claim 4 in the form of calcium sodium potassium polyphosphate or calcium sodium potassium metaphosphate.
6. A method of making calcium polyphosphate salt in particulate form comprising the steps of:
(a) preparing a calcium phosphate salt having a phosphorus chain length of from about 9 to about 16, and a calcium:polyphosphate molar ratio of from about 5:1 to about 9:1, in the form of an amorphous glass solid;
(b) dehydrating the amorphous glass solid to form a solid having a water content no greater than about 0.1%; and
(c) processing the solid to form particles having an average particle size no greater than about 0.5 μm.
7. The method according to claim 6 wherein the calcium polyphosphate salt has a phosphorus chain length of from about 11 to about 15.
8. The method according to claim 7 wherein the calcium polyphosphate salt has a calcium:phosphorus molar ratio of about 5.5.
9. The method according to claim 7 wherein the water content of the dehydrated solid is no greater than about 0.05%.
10. The method according to claim 7 wherein the dehydrated solid is processed by grinding to form particles.
11. The method according to claim 10 wherein the particles have an average particle size of from about 0.1 μm to about 0.3 μm.
12. The method according to claim 7 wherein the calcium polyphosphate salt is selected from the group consisting of calcium metaphosphate, calcium sodium metaphosphate, calcium sodium potassium metaphosphate, calcium sodium polyphosphate, and calcium sodium potassium polyphosphate.