Kamonchanok Thananukul - Academia.edu (original) (raw)

Uploads

Papers by Kamonchanok Thananukul

Advanced Drug Delivery Reviews, Jul 1, 2021

The design of smart drug delivery carriers has recently attracted great attention in the biomedic... more The design of smart drug delivery carriers has recently attracted great attention in the biomedical field. Smart carriers can specifically respond to physical and chemical changes in their environment, such as temperature, photoirradiation, ultrasound, magnetic field, pH, redox species, and biomolecules. This review summarizes recent advances in the integration of porous particles and stimuli-responsive gatekeepers for effective drug delivery. Their unique structural properties play an important role in facilitating the diffusion of drug molecules and cell attachment. Various techniques for fabricating porous materials, with their major advantages and limitations, are summarized. Smart gatekeepers provide advanced functions such as "open-close" switching by functionalized stimuli-responsive polymers on a particle's pores. These controlled delivery systems enable drugs to be targeted at specific rates, time programs, and sites of the human body. The gate structures, gating mechanisms, and controlled release mechanisms of each trigger are detailed. Current ongoing research and future trends in targeted drug delivery, tissue engineering, and regenerative medicine applications are highlighted.

Scientific Reports

Alcoholysis is a promising approach for upcycling postconsumer polylactide (PLA) products into va... more Alcoholysis is a promising approach for upcycling postconsumer polylactide (PLA) products into valuable constituents. In addition, an alcohol-acidolysis of PLA by multifunctional 2,2-bis(hydroxymethyl)propionic acid (DMPA) produces lactate oligomers with hydroxyl and carboxylic acid terminals. In this work, a process for sizing down commercial PLA resin to optimum medium-sized lactate oligomers is developed at a lower cost than a bottom-up synthesis from its monomer. The microwave-assisted reaction is conveniently conducted at 220–240 °C and pressure lower than 100 psi. The PLA resin was completely converted via alcohol-acidolysis reaction, with a product purification yield as high as 93%. The resulting products are characterized by FTIR, 2D-NMR, 1H-NMR, GPC, DSC, and XRD spectroscopy. The effects of PLA: DMPA feed ratios and the incorporation of 1,4-butanediol (BDO) on the structures, properties, and particle formability of the alcohol-acidolyzed products are examined. The products...

Progress in Organic Coatings

Scientific Reports

Stimuli-responsive controlled delivery systems are of interest for preventing premature leakages ... more Stimuli-responsive controlled delivery systems are of interest for preventing premature leakages and ensuring precise releases of active compounds at target sites. In this study, porous biodegradable micro/nanoparticles embedded with thermoresponsive gatekeepers are designed and developed based on Eudragit RS100 (PNIPAM@RS100) and poly(N-isopropylacrylamide) via a double emulsion solvent evaporation technique. The effect of initiator types on the polymerization of NIPAM monomer/methylene-bis-acrylamide (MBA) crosslinker was investigated at 60 °C for thermal initiators and ambient temperature for redox initiators. The crosslinked PNIPAM plays a key role as thermal-triggered gatekeepers with high loading efficiency and precise release of a model active compound, Nile Blue A (NB). Below the volume phase transition temperature (TVPT), the gatekeepers possess a swollen conformation to block the pores and store NB within the cavities. Above its TVPT, the chains rearrange, allowing gate op...

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019

Bio-degradable/bio-compatible poly(lactide-co-glycidyl methacrylate), P(LA-co-GMA), a copolymer h... more Bio-degradable/bio-compatible poly(lactide-co-glycidyl methacrylate), P(LA-co-GMA), a copolymer has been synthesized. The material contains curable C_C groups, which enable its self-curing and grafting reactions with other vinyl monomers. The copolymer was grafted with a pH-responsive polyacrylamide (PAAm), by UVassisted reactions using acrylamide (AAm) and N,N′-methylene bisacrylamide monomers, and various photoinitiator systems. The original copolymer and its partially-cured counterpart were employed in the grafting reaction. Chemical structures and properties of the resulting materials were characterized. Standard quantitative analysis techniques for measurement of the grafted AAm content and the degree of C_C conversion have been developed by 1 H NMR and FTIR spectroscopy. FTIR offers more advantages, in terms of non-destructive analysis, ease of operation, and lower cost of analysis. The results show that the grafted products from pre-cured P(LA-co-GMA) copolymers contain higher grafted AAm contents than their uncured counterparts. The highest grafted AAm content was obtained by using benzophenone (BP) as an initiator, while camphorquinone (CQ) led to the lowest content. In contrast, the degree of C_C conversion of the copolymer from the two initiator systems shows a reverse trend. These amphiphilic and pH-responsive grafted copolymers with tunable AAm contents have a high potential for use in various applications, especially in biomedical and environmental fields.

Chiang Mai Journal of Science, 2014

The effects of adding bromoform (CHBr3) as a potential chain transfer agent in the photopolymeris... more The effects of adding bromoform (CHBr3) as a potential chain transfer agent in the photopolymerisation of acrylamide (AM) in aqueous solution have been studied both in terms of influencing the rate of polymerisation and the molecular weight of the polyacrylamide (PAM) formed. Using 4,4′-azo-bis(4-cyanopentanoic acid) (ACPA) as photoinitiator, two different CHBr3 concentrations as chain transfer agent were compared: 0.5 and 2.0 mol % (relative to AM), the higher of which was determined by the limit of CHBr3 water solubility. The results showed that CHBr3 was an effective chain transfer agent that could regulate the molecular weight of the PAM formed without seriously affecting the polymerisation rate. It is concluded that chain transfer to CHBr3occurs by both Br and H atom transfer although Br transfer is the more favoured due to the weaker C-Br bond. Furthermore, Br transfer leads to Br-terminated chains in which the terminal C-Br bond can re-dissociate leading to re-initiation and ...

A biomaterial was developed by blending a commercially available poly( L -lactic acid) (PLLA) wit... more A biomaterial was developed by blending a commercially available poly( L -lactic acid) (PLLA) with cellulose acetate (CA) using a solvent casting technique. PLLA and CA have great potential for the manufacture of environmentally friendly thin films packaging but there is very limited number of studies on their blend compatibility. This work aimed to evaluate the compatibility of PLLA and CA in a solution form. The solution blends of various PLLA/CA weight percentages (0-100 %w/w) were prepared in a chloroform/acetone mixture solvent. Both physical and spectroscopic techniques were employed to characterize the homogeneity, structural integrity and various physicochemical properties of the films. Results indicated that PLLA was partially compatible with CA and the optically transparent films were only observed in either the PLLA- or CA-rich blend. However, this limit could be further extended by partial hydrolysis of the two polymers through the addition of hydrochloric acid. By alter...

Nowadays, bio-plastic is the most popular in packaging field. Green chemistry and environmental r... more Nowadays, bio-plastic is the most popular in packaging field. Green chemistry and environmental responsibility has led it to develop the bio-plastic for use as packaging. Polylactic acid (PLA) is the well known staring material in this area. However, some properties of PLA films have to develop. Polymer blend is the interesting technique, in this work, PLA/Cellulose acetate (CA) blend films were prepare by casting solution at various compositions. Mixing solvent of Chloroform and acetone in acid condition were used, it was found that the mixing solvent can improved the compatibility and mechanical properties of the blend films. From this work CA can significantly increase PLA properties both the usefulness and the possible applications for bio-plastic material.

Advanced Drug Delivery Reviews

Biodegradable/biocompatible microspheres have been prepared from poly(lactic acid-co-glycidyl met... more Biodegradable/biocompatible microspheres have been prepared from poly(lactic acid-co-glycidyl methacrylate), P(LA-co-GMA), copolymers by a phase inversion emulsification (PIE) process. As the copolymer contains unsaturated functional groups, this can be crosslinked by employing thermo-curing reaction. Effects of co-surfactant concentrations and the aqueous phase addition rate on efficiency of the particle formation are evaluated. The addition of sodium dodecyl sulfate (SDS) co-surfactant at slow rates leads to narrow size distribution and higher stability of the microspheres, due to formation of effective structures of polyvinyl alcohol (PVA) surfactant and SDS at the oil/aqueous interface. The resulting microspheres are spherical shape with rough wrinkled surface morphology and bimodal particles size distribution at 1 and 10 μm. Curable behavior of the microspheres are also investigated. The semi-crystalline particles consist of network structure with high gel content of 50%, as th...

Advanced Drug Delivery Reviews, Jul 1, 2021

The design of smart drug delivery carriers has recently attracted great attention in the biomedic... more The design of smart drug delivery carriers has recently attracted great attention in the biomedical field. Smart carriers can specifically respond to physical and chemical changes in their environment, such as temperature, photoirradiation, ultrasound, magnetic field, pH, redox species, and biomolecules. This review summarizes recent advances in the integration of porous particles and stimuli-responsive gatekeepers for effective drug delivery. Their unique structural properties play an important role in facilitating the diffusion of drug molecules and cell attachment. Various techniques for fabricating porous materials, with their major advantages and limitations, are summarized. Smart gatekeepers provide advanced functions such as "open-close" switching by functionalized stimuli-responsive polymers on a particle's pores. These controlled delivery systems enable drugs to be targeted at specific rates, time programs, and sites of the human body. The gate structures, gating mechanisms, and controlled release mechanisms of each trigger are detailed. Current ongoing research and future trends in targeted drug delivery, tissue engineering, and regenerative medicine applications are highlighted.

Scientific Reports

Alcoholysis is a promising approach for upcycling postconsumer polylactide (PLA) products into va... more Alcoholysis is a promising approach for upcycling postconsumer polylactide (PLA) products into valuable constituents. In addition, an alcohol-acidolysis of PLA by multifunctional 2,2-bis(hydroxymethyl)propionic acid (DMPA) produces lactate oligomers with hydroxyl and carboxylic acid terminals. In this work, a process for sizing down commercial PLA resin to optimum medium-sized lactate oligomers is developed at a lower cost than a bottom-up synthesis from its monomer. The microwave-assisted reaction is conveniently conducted at 220–240 °C and pressure lower than 100 psi. The PLA resin was completely converted via alcohol-acidolysis reaction, with a product purification yield as high as 93%. The resulting products are characterized by FTIR, 2D-NMR, 1H-NMR, GPC, DSC, and XRD spectroscopy. The effects of PLA: DMPA feed ratios and the incorporation of 1,4-butanediol (BDO) on the structures, properties, and particle formability of the alcohol-acidolyzed products are examined. The products...

Progress in Organic Coatings

Scientific Reports

Stimuli-responsive controlled delivery systems are of interest for preventing premature leakages ... more Stimuli-responsive controlled delivery systems are of interest for preventing premature leakages and ensuring precise releases of active compounds at target sites. In this study, porous biodegradable micro/nanoparticles embedded with thermoresponsive gatekeepers are designed and developed based on Eudragit RS100 (PNIPAM@RS100) and poly(N-isopropylacrylamide) via a double emulsion solvent evaporation technique. The effect of initiator types on the polymerization of NIPAM monomer/methylene-bis-acrylamide (MBA) crosslinker was investigated at 60 °C for thermal initiators and ambient temperature for redox initiators. The crosslinked PNIPAM plays a key role as thermal-triggered gatekeepers with high loading efficiency and precise release of a model active compound, Nile Blue A (NB). Below the volume phase transition temperature (TVPT), the gatekeepers possess a swollen conformation to block the pores and store NB within the cavities. Above its TVPT, the chains rearrange, allowing gate op...

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019

Bio-degradable/bio-compatible poly(lactide-co-glycidyl methacrylate), P(LA-co-GMA), a copolymer h... more Bio-degradable/bio-compatible poly(lactide-co-glycidyl methacrylate), P(LA-co-GMA), a copolymer has been synthesized. The material contains curable C_C groups, which enable its self-curing and grafting reactions with other vinyl monomers. The copolymer was grafted with a pH-responsive polyacrylamide (PAAm), by UVassisted reactions using acrylamide (AAm) and N,N′-methylene bisacrylamide monomers, and various photoinitiator systems. The original copolymer and its partially-cured counterpart were employed in the grafting reaction. Chemical structures and properties of the resulting materials were characterized. Standard quantitative analysis techniques for measurement of the grafted AAm content and the degree of C_C conversion have been developed by 1 H NMR and FTIR spectroscopy. FTIR offers more advantages, in terms of non-destructive analysis, ease of operation, and lower cost of analysis. The results show that the grafted products from pre-cured P(LA-co-GMA) copolymers contain higher grafted AAm contents than their uncured counterparts. The highest grafted AAm content was obtained by using benzophenone (BP) as an initiator, while camphorquinone (CQ) led to the lowest content. In contrast, the degree of C_C conversion of the copolymer from the two initiator systems shows a reverse trend. These amphiphilic and pH-responsive grafted copolymers with tunable AAm contents have a high potential for use in various applications, especially in biomedical and environmental fields.

Chiang Mai Journal of Science, 2014

The effects of adding bromoform (CHBr3) as a potential chain transfer agent in the photopolymeris... more The effects of adding bromoform (CHBr3) as a potential chain transfer agent in the photopolymerisation of acrylamide (AM) in aqueous solution have been studied both in terms of influencing the rate of polymerisation and the molecular weight of the polyacrylamide (PAM) formed. Using 4,4′-azo-bis(4-cyanopentanoic acid) (ACPA) as photoinitiator, two different CHBr3 concentrations as chain transfer agent were compared: 0.5 and 2.0 mol % (relative to AM), the higher of which was determined by the limit of CHBr3 water solubility. The results showed that CHBr3 was an effective chain transfer agent that could regulate the molecular weight of the PAM formed without seriously affecting the polymerisation rate. It is concluded that chain transfer to CHBr3occurs by both Br and H atom transfer although Br transfer is the more favoured due to the weaker C-Br bond. Furthermore, Br transfer leads to Br-terminated chains in which the terminal C-Br bond can re-dissociate leading to re-initiation and ...

A biomaterial was developed by blending a commercially available poly( L -lactic acid) (PLLA) wit... more A biomaterial was developed by blending a commercially available poly( L -lactic acid) (PLLA) with cellulose acetate (CA) using a solvent casting technique. PLLA and CA have great potential for the manufacture of environmentally friendly thin films packaging but there is very limited number of studies on their blend compatibility. This work aimed to evaluate the compatibility of PLLA and CA in a solution form. The solution blends of various PLLA/CA weight percentages (0-100 %w/w) were prepared in a chloroform/acetone mixture solvent. Both physical and spectroscopic techniques were employed to characterize the homogeneity, structural integrity and various physicochemical properties of the films. Results indicated that PLLA was partially compatible with CA and the optically transparent films were only observed in either the PLLA- or CA-rich blend. However, this limit could be further extended by partial hydrolysis of the two polymers through the addition of hydrochloric acid. By alter...

Nowadays, bio-plastic is the most popular in packaging field. Green chemistry and environmental r... more Nowadays, bio-plastic is the most popular in packaging field. Green chemistry and environmental responsibility has led it to develop the bio-plastic for use as packaging. Polylactic acid (PLA) is the well known staring material in this area. However, some properties of PLA films have to develop. Polymer blend is the interesting technique, in this work, PLA/Cellulose acetate (CA) blend films were prepare by casting solution at various compositions. Mixing solvent of Chloroform and acetone in acid condition were used, it was found that the mixing solvent can improved the compatibility and mechanical properties of the blend films. From this work CA can significantly increase PLA properties both the usefulness and the possible applications for bio-plastic material.

Advanced Drug Delivery Reviews

Biodegradable/biocompatible microspheres have been prepared from poly(lactic acid-co-glycidyl met... more Biodegradable/biocompatible microspheres have been prepared from poly(lactic acid-co-glycidyl methacrylate), P(LA-co-GMA), copolymers by a phase inversion emulsification (PIE) process. As the copolymer contains unsaturated functional groups, this can be crosslinked by employing thermo-curing reaction. Effects of co-surfactant concentrations and the aqueous phase addition rate on efficiency of the particle formation are evaluated. The addition of sodium dodecyl sulfate (SDS) co-surfactant at slow rates leads to narrow size distribution and higher stability of the microspheres, due to formation of effective structures of polyvinyl alcohol (PVA) surfactant and SDS at the oil/aqueous interface. The resulting microspheres are spherical shape with rough wrinkled surface morphology and bimodal particles size distribution at 1 and 10 μm. Curable behavior of the microspheres are also investigated. The semi-crystalline particles consist of network structure with high gel content of 50%, as th...