A mussel‐inspired strategy toward antimicrobial and bacterially anti‐adhesive soy protein surface

Abstract

Biopolymer products are widely used in our everyday life, however, the poor antimicrobial nature dramatically limits their applications. Therefore, it is essential to improve the antibiotic performance of these biopolymer products. In this study, soy protein isolate (SPI)-based films with antimicrobial and antifouling function were fabricated through a dip-coating method. Briefly, mussel-inspired polydopamine was coated onto the surface of SPI film, followed by depositing silver nanoparticles (AgNPs) on the film for yielding an antimicrobial film, named S-DA-Ag. Subsequently, octadecyltrichlorosilane (OTS) molecular was attached on the S-DA-Ag film. Elemental and morphological surface analyses verified the successful coating for each step. The S-DA film decorated only with AgNPs exhibited an effective antimicrobial activity against Escherichia coli and Staphylococcus aureus but failed to prevent bacterial attachment. However, the number of attached bacterial cells significantly decreased for the OTS-coated S-DA-Ag film.Additionally, the resultant SPI-based films displayed excellent mechanical performance and remarkably improved water resistance, dramatically benefiting their practical applications. This novel design can endow the antimicrobial and antifouling properties to the SPI-based films and enhance their mechanical properties and water resistance, which might expand their potential applications in the healthcare and biomedical fields. K E Y W O R D Sbiopolymers, coatings, films, proteins

Novel Terahertz Spectroscopy Technology for Crystallinity and Crystal Structure Analysis of Cellulose

“…[1][2][3]. Nowadays, there are many methods to test the crystallinity of fibers, such as XRD and FT-IR, which detect the absorption peak characteristics of cellulose samples in a certain band [4][5][6]. However, the study of crystallinity at present is only in the medium and high frequency band.…”

An insight on sources and biodegradation of bioplastics: a review

“…Microbial contamination is another downside of the material. Several studies have used different nanoparticles and metal ions to impart antimicrobial activity to SPI-based films (Jin et al 2020 ). A self-healing, antimicrobial, SPI bioplastic was developed with good mechanical strength using polyethyleneimine (PEI) and metal ions such as Cu 2+ or Zn 2+ .…”

Recent Progress in Robust Regenerated Soy Protein Film

“…Metal ions such as silver, [ 141 ] copper, [ 77 ] and zinc [ 142 ] have certain antibacterial activity in SP film. [ 134 ] These metal ions can bind with proteins, thereby exerting antibacterial effects.…”

“…[ 147 ] Introducing AgNPs into SP film can enhance their antibacterial properties. [ 141 ] It is worth mentioning that chitin nanocrystals (CNW) derived from chitin can serve as effective reducing agents for synthesizing AgNPs from a silver salt solution. Antibacterial experiments have demonstrated a significant inhibition in the radial growth of fungi, with a percentage inhibition value of 62.5% for the SP‐CNW‐AgNPs film.…”