Fabrication of biodegradable straw from soy protein Isolate and cassava starch blend

Name: Wissuta Choeybundit

keyword: Soy Protein Isolate

MeSH: Soy proteins -- 298836

Classification :.DDC: e-Theses

; Cassava Starch

MeSH: Soybean -- 298837

MeSH: Tapioca starch -- 298838

MeSH: Biodegradable products -- 140942

MeSH: Pasta machines -- 298839

LCSH: Soy proteins -- 298836

LCSH: Soybean -- 298837

LCSH: Tapioca starch -- 298838

LCSH: Biodegradable products -- 140942

LCSH: Pasta machines -- 298839

Abstract: Plastic straws make the world’s problem for the global environment when were thrown into the ocean. Newly biodegradable polymers are attracting great attention because they are environmentally friendly, safe for consumers, and inexpensive. Newly biodegradable polymers are attracting great attention because they are environmentally friendly, safe for consumers, and inexpensive. Soy protein isolate (SPI) and cassava starch (CS) are alternative biopolymers to petroleum-based polymers with many advantages such as biodegradability and home compostability. This study aimed to investigate the optimum formulation and condition of compounding for soy protein isolate/cassava starch production and to evaluate the properties of soy protein isolate/cassava starch. The straw formulation was composed of four ingredients: SPI, CS, glycerol, and water. There were three formulations: F1 (SPI: 24.4%, CS: 24.4%), F2 (SPI: 19.5%, CS: 29.4%), and F3 (SPI: 14.6%, CS: 34.2%). Water and glycerol contents were the same for all formulations, with 36.6% and 14.6%, respectively. The characterization of straws was investigated in terms of stability under conditions of use. For water absorption measurement, straw samples were immersed in a buffer solution at pH 2, 5, and 8 (30 mL) for 5, 10, 15, and 20 min. After 5 min of soaking, the straws softened, making them impossible to drink from. A coating should be applied on straws to prevent water absorption. The mechanical property of the straws was investigated by a Three-point bending test at different water activities (aw) and formulation F2 showed higher bending strength at all aws from 0.11 to 0.92 than other formulations. Consequently, the F2 straw was selected to apply a coating for hydrophobicity improvement. Beeswax and shellac were used as the coating material for SPI/CS straws. Shellac coating presented lower water absorption of straw than coating with beeswax and delayed the softening of straw longer than 6 hours of immersion. The results indicated that compostable SPI/CS straw with the natural wax coating has the potential to be used as an alternative compostable and biodegradable straw for the beverage.

Mae Fah Luang University. Learning Resources and Educational Media Center

Address: CHIANG RAI

Email: library@mfu.ac.th

Name: Wirongrong Tongdeesoontorn

Role: Advisor

Created: 2022

Modified: 2023-03-03

Issued: 2023-03-03

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: e-Theses

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Posthavest Technology and Innovation

Grantor: Mae Fah Luang University

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