	US 11,666,164 B2
	Soy protein straw and manufacturing process thereof
Morgan J Malm, Kentland, IN (US); Natalie Stephenson, Austin, TX (US); and Ruth Zhong, Woodland Hills, CA (US)
Assigned to Purdue Research Foundation, West Lafayette, IN (US)
Filed by Purdue Research Foundation, West Lafayette, IN (US)
Filed on May 8, 2020, as Appl. No. 16/869,841.
Claims priority of provisional application 62/846,089, filed on May 10, 2019.
Prior Publication US 2020/0352373 A1, Nov. 12, 2020
Int. Cl. A47G 21/18 (2006.01); A23G 3/44 (2006.01); A23G 3/54 (2006.01); A23P 30/10 (2016.01); A23G 3/36 (2006.01)

CPC A47G 21/18 (2013.01) [A23G 3/362 (2013.01); A23G 3/44 (2013.01); A23G 3/545 (2013.01); A23P 30/10 (2016.08)]

15 Claims

11. A process for manufacturing environment friendly biodegradable soy protein straw comprising the steps of

a. preparing soy protein isolate, glycerol, confectioners glaze, sodium hydroxide and water;

b. mixing said soy protein isolate, glycerol and water with magnetic stirring to afford a soy protein solution;

c. heating said soy protein solution to about 80° C. for about 30 min;

d. cooling said soy protein solution to about room temperature;

e. adjusting the pH of cooled soy protein solution to about 10 using a sodium hydroxide solution;

f. adding optional food coloring ingredient and/or flavoring agent under stirring;

g. preparing a soy protein film by casting said soy protein solution to a surface, wherein said surface has a coating of polydimethylsiloxane (PDMS) to facilitate removal of said soy protein film;

h. curing and then peeling said soy protein film from said surface while said soy protein film is flexible;

i. rolling said soy protein film into a tube and sealing the seam with a solution of soy protein;

j. cutting said tube into the size of an individual straw and further dehydrating; and

k. coating said individual straw with confectioner's glaze to afford said environment friendly biodegradable soy protein straw.