Preparation and characterization of soy protein films with a durable water resistance-adjustable and antimicrobial surface.
A water resistant surface was first obtained by immobilizing hydrophobic copolymers, poly (styrene-co-glycidyl methacrylate) (PSG), with functional groups on soy protein isolate (SPI) films. XPS and AFM results showed that PSG copolymers were immobilized on the film by chemical bonding, and formed a rough surface with some bumps because of the segregation of two different phases on PSG copolymers. Water resistance of the modified films could be adjusted dramatically by further immobilizing different amounts of guanidine-based antimicrobial polymers, poly (hexamethylene guanidine hydrochloride) (PHMG) on the resulting hydrophobic surface. The introduction of hydrophilic PHMG on the resulting surface generated many micropores, which potentially increased the water uptake of the modified films. Furthermore, the modified SPI films showed higher thermostability compared to native SPI film and broad-spectrum antimicrobial activity by contact killing, attributed to the presence of PHMG on the surface. The modified SPI film with a multi-functional surface showed potential for applications in the packaging and medical fields.
Guelph Research and Development Centre, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, ON N1G 5C9, Canada. Electronic address: lsz@ecust.edu.cn.
Shuzhao
S
Li
Guelph Research and Development Centre, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, ON N1G 5C9, Canada. Electronic address: elizabeth.donner@agr.gc.ca.
Elizabeth
E
Donner
Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada. Electronic address: hxiao@unb.ca.
Huining
H
Xiao
Department of Chemical Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada. Electronic address: mthomps@mcmaster.ca.
Michael
M
Thompson
Department of Food Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada. Electronic address: yachuanzhang28@hotmail.com.
Yachuan
Y
Zhang
Canola Council of Canada, Winnipeg, MB R3B 0T6, Canada. Electronic address: rempelc@canolacouncil.org.
Curtis
C
Rempel
Guelph Research and Development Centre, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, ON N1G 5C9, Canada. Electronic address: Qiang.Liu@agr.gc.ca.
Qiang
Q
Liu
D000890:Anti-Infective Agents / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D018625:Microscopy, Atomic Force; D018613:Microscopy, Confocal; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D030262:Soybean Proteins / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry*
D000890:Anti-Infective Agents; D011108:Polymers; D030262:Soybean Proteins; D014867:Water
Antimicrobial activity; Chemical bonding; Soy protein isolate (SPI); Surface immobilization; Water resistance