Pickering Emulsion Catalysis: Interfacial Chemistry, Catalyst Design, Challenges, and Perspectives

Ni, Lin; Yu, Chang; Wei, Qianbing; Liu, Dongming; Qiu, Jieshan

doi:10.1002/anie.202115885

Cited by 104 publications

(54 citation statements)

References 232 publications

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“…Catalytic system with Pickering emulsion (PE) provides a distinct platform, which can perform more than traditional catalysis technology 59 . Generally, PE, composed of aqueous-organic biphasic system stabilized by solid particles, can compartmentalize droplets to control the chemical process in response to stimulus, as well as the isolation or protection of incompatible reagents and the sensitive species that can be easily affected by the harsh reaction conditions 60 , 61 .…”

Section: Ph-induced Switchable Catalytic Systemsmentioning

confidence: 99%

Switchable aqueous catalytic systems for organic transformations

Das

Maity

2022

Commun Chem

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In living organisms, enzyme catalysis takes place in aqueous media with extraordinary spatiotemporal control and precision. The mechanistic knowledge of enzyme catalysis and related approaches of creating a suitable microenvironment for efficient chemical transformations have been an important source of inspiration for the design of biomimetic artificial catalysts. However, in “nature-like” environments, it has proven difficult for artificial catalysts to promote effective chemical transformations. Besides, control over reaction rate and selectivity are important for smart application purposes. These can be achieved via incorporation of stimuli-responsive features into the structure of smart catalytic systems. Here, we summarize such catalytic systems whose activity can be switched ‘on’ or ‘off’ by the application of stimuli in aqueous environments. We describe the switchable catalytic systems capable of performing organic transformations with classification in accordance to the stimulating agent. Switchable catalytic activity in aqueous environments provides new possibilities for the development of smart materials for biomedicine and chemical biology. Moreover, engineering of aqueous catalytic systems can be expected to grow in the coming years with a further broadening of its application to diverse fields.

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Section: Ph-induced Switchable Catalytic Systemsmentioning

confidence: 99%

Switchable aqueous catalytic systems for organic transformations

Das

Maity

2022

Commun Chem

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“…Thus, the scope to optimize the productivity in BioPE with dissolved enzymes appears rather limited. Putting the enzymes on -or rather in -the stabilizing particles will probably overcome the obstacle and in addition, benefit from the general advantages of performing PIC, such as even smaller mass transfer restrictions (Ni et al, 2022). Results from BioPE using lipase in polymerosomes or adsorbed to the silica particles support this view (Pera-Titus et al, 2015;Meng et al, 2019;Wang et al, 2019;Sun et al, 2020).…”

Section: Particle Choice and Biocatalyst Locationmentioning

confidence: 99%

Key technology to non-aqueous and multi-step biocatalysis: Pickering emulsions

Ansorge‐Schumacher

Plikat

2022

Front. Catal.

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Considering the importance of biocatalysis in chemical synthesis, technologies allowing full exploitation of its potential are urgently wanted. Eleven years ago, our team proposed Pickering emulsions as a concept to overcome the severe restrictions set by the general requirement for the presence of water. In this brief perspective, we demonstrate that the insights into bioactive Pickering emulsions gathered meanwhile strongly designate it a key technology to non-aqueous and multi-step biocatalysis. Mainly, this relates to the extensive compatibility of this system with different solvents, materials, biocatalysts, reactions and demands on productive use. We here give a brief overview of the most relevant details, including recent results from our own research.

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“…They not only endow food products unique and various flavors, appearances, textures, and tastes, but also can be used as controlled delivery systems to encapsulate and protect nutrients or functional active ingredients [ 1 , 2 , 3 ]. The Pickering emulsion is a kind of emulsion first reported by Ramsden (1903) and Pickering (1907), formed by solid particles irreversibly adsorbed on the liquid–liquid or air–liquid interface [ 4 , 5 ]. Compared with conventional emulsions stabilized by low-molecular-weight surfactants and macromolecular emulsifiers, the surfactant-free Pickering emulsion has the unique potential advantages of high stability against droplet flocculation or coalescence, low toxicity and no irritation, high availability, and low cost [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Cellulose Nanofibril-Based Pickering Emulsions: Recent Trends and Applications in the Food Industry

Zhang

Wang

Liu

et al. 2022

Foods

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The Pickering emulsion stabilized by food-grade colloidal particles has developed rapidly in recent decades and attracts extensive attention for potential applications in the food industry. Bacterial cellulose nanofibrils (BCNFs), as green and sustainable colloidal nanoparticles derived from bacterial cellulose, have various advantages for Pickering emulsion stabilization and applications due to their unique properties, such as good amphiphilicity, a nanoscale fibrous network, a high aspect ratio, low toxicity, excellent biocompatibility, and sustainability. This review provides a comprehensive overview of the recent advances in the Pickering emulsion stabilized by BCNF particles, including the classification, preparation method, and physicochemical properties of diverse BCNF-based particles as Pickering stabilizers, as well as surface modifications with other substances to improve their emulsifying performance and functionality. Additionally, this paper highlights the stabilization mechanisms and provides potential food applications of BCNF-based Pickering emulsions, such as nutrient encapsulation and delivery, edible coatings and films, fat substitutes, etc. Furthermore, the safety issues and future challenges for the development and food-related applications of BCNFs-based Pickering emulsions are also outlined. This work will provide new insights and more ideas on the development and application of nanofibril-based Pickering emulsions for researchers.

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Pickering Emulsion Catalysis: Interfacial Chemistry, Catalyst Design, Challenges, and Perspectives

Cited by 104 publications

References 232 publications

Switchable aqueous catalytic systems for organic transformations

Switchable aqueous catalytic systems for organic transformations

Key technology to non-aqueous and multi-step biocatalysis: Pickering emulsions

Bacterial Cellulose Nanofibril-Based Pickering Emulsions: Recent Trends and Applications in the Food Industry

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