Alkenyl succinic acid anhydride half ester emulsifier

Abstract

The present invention relates to a starch emulsifier product prepared by sufficiently solubilizing a starch and subsequently sufficiently derivatizing the sufficiently solubilized starch product, in one embodiment by reacting the sufficiently solubilized starch with an alkenyl succinic anhydride. Such starch emulsifier products are useful as emulsifying and/or encapsulating agents, particularly in systems where high load and retention of the active ingredient, low surface oil exposure, and excellent oxidation resistance is desired.

1 . An emulsifier product comprising:
 a starch half ester of an alkenyl succinic anhydride,   wherein the starch half ester of an alkenyl succinic anhydride has a water fluidity of not more than 75,   wherein the starch half ester of an alkenyl succinic anhydride is prepared by a dispersed phase process, and   wherein, when the starch half ester of an alkenyl succinic anhydride is used to prepare a test oil-in-water emulsion with the starch half ester of an alkenyl succinic anhydride as a sole emulsifier at a w/w ratio of the starch half ester of an alkenyl succinic anhydride:oil of 1:4 with a 20% by weight oil load, the test oil-in-water emulsion is characterized by at least the following:
 a) no more than about 5% of the oil particles of the emulsion greater than 1 micron after 24 hours at 57° C. as assessed by polarization intensity differential plus elastic light scattering; and 
 b) a Brookfield viscosity of the emulsion of less than about 2000 cps after about one week of storage at 5° C., as assessed by Brookfield Programmable DV-1 Viscometer. 
   
     
     
         2 . The emulsifier product of  claim 1 , wherein the starch is a half ester of an octenyl succinic anhydride. 
     
     
         3 . The emulsifier product of  claim 1 , wherein the water fluidity of the starch is not greater than 65. 
     
     
         4 . The emulsifier product of  claim 1 , wherein the water fluidity of the starch is not greater than 40. 
     
     
         5 . The emulsifier product of  claim 1 , wherein the water fluidity of the starch is not greater than 20. 
     
     
         6 . The emulsifier product of  claim 1 , wherein the starch is a half ester of an octenyl succinic anhydride and the water fluidity of the starch is not greater than 40. 
     
     
         7 . The emulsifier product of  claim 1 , wherein the average particle size of the emulsifier product may be characterized as less than one micron, as assessed by Polarization Intensity Differential Plus Elastic Light Scattering (Beckman Coulter LS 13 320 Aqueous Module). 
     
     
         8 . The emulsifier product of  claim 1 , wherein the test oil-in-water emulsion has the w/w ratio of the starch half ester of an alkenyl succinic anhydride:oil of 1:6. 
     
     
         9 . The emulsifier product of  claim 1 , wherein the test oil-in-water emulsion has a 24% by weight oil load 
     
     
         10 . An emulsion comprising
 an oil;   a water;   a starch;   wherein the starch is a half ester of an alkenyl succinic anhydride;   wherein the starch is prepared by a dispersed phase process;   wherein the starch is characterized by a water fluidity of no more than 75, and   wherein the starch is characterizable by the following:   when the starch is used to prepare a test oil-in-water emulsion with the starch as a sole emulsifier at a w/w ratio of the starch:oil of 1:4 and an oil load of 20% by weight, the test oil-in-water emulsion is characterized by at least the following:
 a. no more than about 5% of oil particles of the test emulsion greater than 1 micron after 24 hours at 57° C. as assessed by polarization intensity differential plus elastic light scattering; and 
 b. a Brookfield viscosity of the test emulsion of less than about 2000 cps after about one week of storage at 5° C., as assessed by Brookfield Programmable DV-1 Viscometer. 
   
     
     
         11 . The emulsion of  claim 10 , wherein the starch is a half ester of an octenyl succinic anhydride. 
     
     
         12 . The emulsion of  claim 10 , wherein the water fluidity of the starch is not greater than 65. 
     
     
         13 . The emulsion of  claim 10 , wherein the water fluidity of the starch is not greater than 40. 
     
     
         14 . The emulsion of  claim 10 , wherein the starch is a half ester of an octenyl succinic anhydride and the water fluidity of the starch is not greater than 40. 
     
     
         15 . The emulsion of  claim 10 , wherein the starch and the oil are present in the emulsion in a ratio of 1:4 and wherein the oil is present in an amount of 12% (w/w) based on the emulsion. 
     
     
         16 . The emulsion of  claim 10 , wherein the starch and the oil are present in the emulsion in a ratio of 1:4 and wherein the oil is present in an amount of 20% (w/w) based on the emulsion. 
     
     
         17 . The emulsion of  claim 10 , wherein the starch and the oil are present in the emulsion in a ratio of 1:4 and wherein the oil is present in an amount of 24% (w/w) based on the emulsion. 
     
     
         18 . The emulsion of  claim 10 , wherein the starch and the oil are present in the emulsion in a ratio of 1:6 and wherein the oil is present in an amount of 12% (w/w) based on the emulsion. 
     
     
         19 . The emulsion of  claim 10 , wherein the starch and the oil are present in the emulsion in a ratio of 1:6 and wherein the oil is present in an amount of 20% (w/w) based on the emulsion. 
     
     
         20 . The emulsion of  claim 10 , wherein the starch and the oil are present in the emulsion in a ratio of 1:6 and wherein the oil is present in an amount of 24% (w/w) based on the emulsion.