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Structural implications of polyphenolic antioxidants
Halake, K.,Birajdar, M.,Lee, J. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.35 No.-
<P>Natural polyphenols have been used in foods, cosmetics, and medicines to exploit their functional properties, including antioxidant, anti-inflammatory, antiviral, antidepressant, analgesic, anti-mutation, and antitumor activities. Because of their protective property against reactive oxygen species in the human body, which are associated with aging-related chronic diseases, polyphenols have been considered as useful building blocks for biomaterials development. Here, recent studies on common polyphenols are summarized and their structural implications are discussed, providing insights into their molecular structure and related properties and evaluating the effect of structural modifications such as functional rearrangements, substitution reactions, and polymeric conjugations. The fundamental understanding of the chemical structure of polyphenols could diversify the strategy for the development of biomimetic, eco-friendly, and biocompatible materials. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Recent application developments of water-soluble synthetic polymers
Halake, K.,Birajdar, M.,Kim, B.S.,Bae, H.,Lee, C.,Kim, Y.J.,Kim, S.,Kim, H.J.,Ahn, S.,An, S.Y.,Lee, J. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.6
In the history of man-made macromolecules, water-soluble polymers have primarily maintained passive roles; examples include the uses of water-soluble polymers for viscosity control and as binders. The importance of water on earth has increased research into the development of active roles for water-soluble polymers. These expanding roles span from medical applications, such as drug delivery to environmental applications, such as the removal of heavy metals. The development of water-soluble polymers brings significant benefits to the structural engineering and production of nanomaterials and electronic materials. The current limits of the structure-property relationship have been challenged to meet these rapidly-developing application areas.
Recently developed applications for natural hydrophilic polymers
Halake, K.,Kim, H.J.,Birajdar, M.,Kim, B.S.,Bae, H.,Lee, C.,Kim, Y.J.,Kim, S.,Ahn, S.,An, S.Y.,Jung, S.H.,Lee, J. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.40 No.-
<P>Natural hydrophilic polymers have been utilized for a variety of applications, ranging from the food industry to the coatings industry. However, recent social needs have demanded rapid progress with regard to medical and environmental applications. Natural hydrophilic polymers have attracted considerable interest due to their physicochemical properties and useful functions. This report explores recent findings made in medical, environmental, and food applications of natural hydrophilic polymers and their modified polymers. Applications of these materials are based on their intrinsic biocompatibility, biodegradability, and non-toxicity. Advances in the chemical modification of natural polymers as well as new source developments are overcoming the physicochemical property limits and high costs of these materials, opening up new opportunities for the development of future applications. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Halake, Kantappa,Lee, Jonghwi Elsevier 2017 Journal of industrial and engineering chemistry Vol.54 No.-
<P><B>Abstract</B></P> <P>Polyphenols are naturally occurring compounds found in fruits and vegetables. They are bulky molecules comprising of hydroxyl groups in the forms of catechol and other phenolic groups. The catechol functionality is believed to be responsible for the adhesive and cross-linking characteristics. Natural polyphenols were grafted onto hyaluronic acid (HA) using epichlorohydrin chemistry, and the successful preparation of novel HA conjugates were confirmed. The reduction potential of polyphenols was inversely related to the DPPH radical scavenging activity of the conjugates, which in turn was linearly related to the adhesion strength of the conjugates. Although polypropylene had no site for hydrogen bonding, the adhesion strength of the conjugates onto polypropylene reflected the numbers of hydroxyl and catechol groups in general. The adhesive strength of the conjugates increased by 20-fold compared to that of the native HA. Although, hesperidin has no catechol groups, it still improved the adhesion strength. Reversible coordination with metal ions facilitated ionic gelation and self-healing properties. Adhesive, antioxidant, gelation, and self-healing properties were successfully achieved simultaneously. These functional properties could make the natural conjugates promising candidates for biomedical applications and environmentally safe materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Natural polyphenols were stably conjugated to hyaluronic acid. </LI> <LI> Structure-antioxidant (or adhesion) property relations were elucidated. </LI> <LI> Additionally, polyphenols provided metal-ion gelation and self-healing properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Applications Using the Metal Affinity of Polyphenols with Mussel-Inspired Chemistry
Halake, Kantappa,Cho, Seungvin,Kim, Junseok,Lee, Taewon,Cho, Yunho,Chi, Sangwon,Park, Minjoon,Kim, Kiho,Lee, Duckhee,Ju, Hyun,Choi, Yongha,Jang, Myoungsu,Choe, GyuHyeong,Lee, Jonghwi The Polymer Society of Korea 2018 Macromolecular Research Vol.26 No.2
Multi-functionality plays a decisive role in tuning and improving fundamental properties of active molecules, and grafting polymerization/conjugation development imparts properties of active molecules to the backbones. Recently, metal-polyphenol coordination networks have attracted a great deal of attention. A variety of transition metal ions can freely combine with catechol/keto-enol containing polyphenols to form metal-polyphenol networks. Herein, the recently studied conjugated polyphenols were summarized and compared to dopamine-conjugated polymers with evaluation of their properties and gelation behaviors. The biomimetic understanding of bioinspired adhesion, metal ion coordination of hydroxyl groups, and their rearrangement within aglycone could expand the ability for the development of biomimetic, eco-friendly, and biocompatible polymers.
Recently developed applications for natural hydrophilic polymers
Kantappa Halake,김현진,Mallinath Birajdar,김병수,배하림,이청천,김유진,김신우,안수환,안수영,정승환,이종휘 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
Natural hydrophilic polymers have been utilized for a variety of applications, ranging from the foodindustry to the coatings industry. However, recent social needs have demanded rapid progress withregard to medical and environmental applications. Natural hydrophilic polymers have attractedconsiderable interest due to their physicochemical properties and useful functions. This report exploresrecent findings made in medical, environmental, and food applications of natural hydrophilic polymersand their modified polymers. Applications of these materials are based on their intrinsicbiocompatibility, biodegradability, and non-toxicity. Advances in the chemical modification of naturalpolymers as well as new source developments are overcoming the physicochemical property limits andhigh costs of these materials, opening up new opportunities for the development of future applications.
Structural implications of polyphenolic antioxidants
Kantappa Halake,Mallinath Birajdar,이종휘 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Natural polyphenols have been used in foods, cosmetics, and medicines to exploit their functionalproperties, including antioxidant, anti-inflammatory, antiviral, antidepressant, analgesic, anti-mutation,and antitumor activities. Because of their protective property against reactive oxygen species in thehuman body, which are associated with aging-related chronic diseases, polyphenols have beenconsidered as useful building blocks for biomaterials development. Here, recent studies on commonpolyphenols are summarized and their structural implications are discussed, providing insights intotheir molecular structure and related properties and evaluating the effect of structural modificationssuch as functional rearrangements, substitution reactions, and polymeric conjugations. The fundamentalunderstanding of the chemical structure of polyphenols could diversify the strategy for the developmentof biomimetic, eco-friendly, and biocompatible materials.
Kantappa Halake,이종휘 한국고분자학회 2020 Macromolecular Research Vol.28 No.4
The functional conjugations with natural polyphenols could be a working strategy for accomplishing the degradation resistance of hyaluronic acids (HA). Herein, a series of HA conjugates with four different polyphenols with wide ranges in the degree of substitution were systematically prepared. The degradation rate could be retarded in a wide range without crosslinking: The conjugates having polyphenolic aglycone (catechin or quercetin) maintained their structures, as identified by viscosity, for up to 7 weeks in the presence of hyaluronidase. This retardation was outstanding compared to those reported from previous studies, and the physical mixtures of HA and polyphenols still showed significantly more retarded degradation than pristine HA. The degradation resistance could be controlled by varying the feed ratio of polyphenols. This conjugation method of polyphenols could open up new application areas of HA with the outstanding degradation resistance.
Recent application developments of water-soluble synthetic polymers
Kantappa Halake,Mallinath Birajdar,김병수,배하림,이청천,김유진,김신우,김현진,안수환,안수영,이종휘 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
In the history ofman-made macromolecules, water-soluble polymers have primarilymaintained passiveroles; examples include the uses of water-soluble polymers for viscosity control and as binders. Theimportance of water on earth has increased research into the development of active roles for watersolublepolymers. These expanding roles span from medical applications, such as drug delivery toenvironmental applications, such as the removal of heavy metals. The development of water-solublepolymers brings significant benefits to the structural engineering and production of nanomaterials andelectronic materials. The current limits of the structure–property relationship have been challenged tomeet these rapidly-developing application areas.