Chemical and Biomolecular Engineering - Research Publications

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Author: Gurr, Paul × End date: 2022 × Start date: 2022 ×

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    Novel packaging development, assessment and authentication using smart technologies, non-invasive biometric sensory tools and artificial intelligence
    Viejo, CG ; Gurr, PA ; Dunshea, FR ; Fuentes, S ; Shukla, A (Springer Nature Singapore, 2022-01-19)
    Packaging creates the first impression from consumers when selecting commercial food or beverages. Different packaging components are important as they contain all areas of interest related to branding, shape, design and nutritional information, which could determine willingness to purchase and success of products in the market. However, traditional packaging acceptability assessments based on focus groups, acceptance and preference tests may be biased and subjective. Therefore, novel assessment methods have been developed based on more objective parameters, including non-invasive biometrics such as eye tracking, emotional responses from consumers and changes in physiological parameters, such as heart rate and body temperature. Emerging technologies have also been studied for packaging assessment, such as virtual/augmented reality and artificial intelligence tools, including computer vision and machine learning modelling. Furthermore, counterfeiting has been a major issue among commercial products, with food and beverages accounting for 10% counterfeited, including packaging and branding. This chapter focuses on the latest research on intelligent and digital technologies for packaging development, assessing consumer acceptability towards packaging and authentication using new and emerging digital technologies.
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    Mechanochromophore-Linked Polymeric Materials with Visible Color Changes
    Qiu, W ; Scofield, JMP ; Gurr, PA ; Qiao, GG (WILEY-V C H VERLAG GMBH, 2022-05)
    Mechanical force as a type of stimuli for smart materials has obtained much attention in the past decade. Color-changing materials in response to mechanical stimuli have shown great potential in the applications such as sensors and displays. Mechanochromophore-linked polymeric materials, which are a growing sub-class of these materials, are discussed in detail in this review. Two main types of mechanochromophores which exhibit visible color change, summarized herein, involve either isomerization or radical generation mechanisms. This review focuses on their synthesis and incorporation into polymer matrices, the type of mechanical force used, factors affecting the mechanochromic properties, and their applications.
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    Crosslinked Polypeptide Films via RAFT-Mediated Continuous Assembly of Polymers
    Chan, NJ ; Lentz, S ; Gurr, PA ; Tan, S ; Scheibel, T ; Qiao, GG (WILEY-V C H VERLAG GMBH, 2022-02-21)
    Polypeptide coatings are a cornerstone in the field of surface modification due to their widespread biological potential. As their properties are dictated by their structural features, subsequent control thereof using unique fabrication strategies is important. Herein, we report a facile method of precisely creating densely crosslinked polypeptide films with unusually high random coil content through continuous assembly polymerization via reversible addition-fragmentation chain transfer (CAP-RAFT). CAP-RAFT was fundamentally investigated using methacrylated poly-l-lysine (PLLMA) and methacrylated poly-l-glutamic acid (PLGMA). Careful technique refinement resulted in films up to 36.1±1.1 nm thick which could be increased to 94.9±8.2 nm after using this strategy multiple times. PLLMA and PLGMA films were found to have 30-50 % random coil conformations. Degradation by enzymes present during wound healing reveals potential for applications in drug delivery and tissue engineering.
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    Vernetzte Polypeptide durch RAFT‐vermittelte Polymerisation zum kontinuierlichen Aufbau von Polymerfilmen
    Chan, NJ ; Lentz, S ; Gurr, PA ; Tan, S ; Scheibel, T ; Qiao, GG (Wiley, 2022-02-21)
    Abstract Polypeptidbeschichtungen spielen aufgrund ihres großen biologischen Potentials eine wichtige Rolle in der Oberflächenmodifizierung von Materialien. Da ihre Eigenschaften durch ihren strukturellen Aufbau mitbestimmt werden, ist eine Kontrolle der Struktur durch entsprechende Herstellungsstrategien notwendig. In diesem Artikel berichten wir über eine einfache Methode zur präzisen Herstellung von dicht vernetzten Polypeptidfilmen mit ungewöhnlich hoher β‐Faltblatt – und Zufallsknäuel Konformation durch eine kontinuierliche Assemblierungspolymerisation (CAP, continuous assembly polymerization) mittels reversibler Addtitions‐Fragmentierungs‐Kettenübertragungspolymerisation (RAFT Polymerisation, reversible‐addition‐fragmentation chain‐transfer polymerization), kurz CAP‐RAFT. CAP‐RAFT wurde bereits grundlegend mit methacryliertem Poly‐l‐Lysin (PLLMA) und methacrylierter Poly‐l‐Glutaminsäure (PLGMA) untersucht. Eine sorgfältige Anpassung der Methode führte hier zu Filmen mit einer Schichtdicke von bis zu 36.1±1.1 nm, die durch mehrfache Anwendung dieser Strategie auf 94.9±8.2 nm erhöht werden konnte. PLLMA‐ und PLGMA‐Filme wiesen überraschenderweise bis zu 30–50 % Zufallsknäuel Konformation auf. Durch den enzymatischen Abbau mit einem Protease‐Mix, der Proteasen im Wundheilungsmileu repräsentiert, konnte das Potential diesen Strukturen für Anwendungen im Wirkstofftransport und in der Gewebezüchtung gezeigt werden.