The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Jun Haginaka - One of the best experts on this subject based on the ideXlab platform.

  • uniformly sized molecularly imprinted polymers for epigallocatechin gallate epicatechin gallate and gallocatechin gallate by multi step swelling and Polymerization Method
    Journal of Chromatography A, 2007
    Co-Authors: Jun Haginaka, Hiromi Tabo, Masaki Ichitani, Takanobu Takihara, Akio Sugimoto, Haruyo Sambe
    Abstract:

    Uniformly-sized, molecularly imprinted polymers (MIPs) for (-)-epigallocatechin gallate (EGCg), -epicatechin gallate (ECg) and -gallocatechin gallate (GCg) were prepared by a multi-step swelling and Polymerization Method using 2-vinylpyridine as a functional monomer, ethylene glycol dimethacrylate as a cross-linker and cyclohexanol as a porogen. Molecular recognition abilities of the obtained MIPs were evaluated in liquid chromatography using a mixture of ethanol and water, or ethanol as the eluent. Each MIP gave the highest molecular recognition ability for the respective template molecule. In addition, (-)-EGCg and -ECg had the same configuration (2R,3R) at positions 2 and 3, and therefore resulting in high cross reactivity each other. However, (-)-GCg, which has different configuration at position 2 with (-)-EGCg and -ECg, showed low cross reactivity with them. On the other hand, those MIPs showed no molecular recognition against (-)-epigallocatechin and -epicatechin, which have no gallate group at position 3. These results indicate that the MIPs prepared can recognize configuration at position 2 and a gallate group at position 3. Furthermore, the MIP for (-)-GCg could be successfully used for isolating (-)-EGCg and -ECg from green tea extract.

  • molecularly imprinted uniform sized polymer based stationary phase for naproxen comparison of molecular recognition ability of the molecularly imprinted polymers prepared by thermal and redox Polymerization techniques
    Journal of Chromatography A, 1998
    Co-Authors: Jun Haginaka, Ken Hosoya, Hisako Takehira, Nobuo Tanaka
    Abstract:

    A molecularly imprinted uniform-sized polymer-based stationary phase for (S)-naproxen has been prepared by a multi-step swelling and thermal or redox Polymerization Method using 4-vinylpyridine and ethylenedimethacrylate as a host functional monomer and cross-linker, respectively. The obtained molecularly imprinted polymers were evaluated using aqueous-rich mobile phases. The molecularly imprinted polymer materials could separate naproxen enantiomers. Further, the materials showed high selectivity for naproxen and moderate selectivity for other 2-arylpropionic acid derivatives. On the other hand, the molecularly imprinted polymer materials showed little selectivity for other acidic compounds, and basic and neutral compounds. With regard to comparison of the molecularly imprinted polymers prepared by thermal and redox Polymerization techniques, the latter materials gave higher retentivity and enantioselectivity than the former materials, while the former materials gave higher column efficiency than the latter materials. Thus, naproxen enantiomers were resolved much better on the molecularly imprinted polymer material prepared by a thermal Polymerization Method.

Chino Kagawa - One of the best experts on this subject based on the ideXlab platform.

Haruyo Sambe - One of the best experts on this subject based on the ideXlab platform.

  • uniformly sized molecularly imprinted polymers for epigallocatechin gallate epicatechin gallate and gallocatechin gallate by multi step swelling and Polymerization Method
    Journal of Chromatography A, 2007
    Co-Authors: Jun Haginaka, Hiromi Tabo, Masaki Ichitani, Takanobu Takihara, Akio Sugimoto, Haruyo Sambe
    Abstract:

    Uniformly-sized, molecularly imprinted polymers (MIPs) for (-)-epigallocatechin gallate (EGCg), -epicatechin gallate (ECg) and -gallocatechin gallate (GCg) were prepared by a multi-step swelling and Polymerization Method using 2-vinylpyridine as a functional monomer, ethylene glycol dimethacrylate as a cross-linker and cyclohexanol as a porogen. Molecular recognition abilities of the obtained MIPs were evaluated in liquid chromatography using a mixture of ethanol and water, or ethanol as the eluent. Each MIP gave the highest molecular recognition ability for the respective template molecule. In addition, (-)-EGCg and -ECg had the same configuration (2R,3R) at positions 2 and 3, and therefore resulting in high cross reactivity each other. However, (-)-GCg, which has different configuration at position 2 with (-)-EGCg and -ECg, showed low cross reactivity with them. On the other hand, those MIPs showed no molecular recognition against (-)-epigallocatechin and -epicatechin, which have no gallate group at position 3. These results indicate that the MIPs prepared can recognize configuration at position 2 and a gallate group at position 3. Furthermore, the MIP for (-)-GCg could be successfully used for isolating (-)-EGCg and -ECg from green tea extract.

Shu Yin - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of graphitic carbon nitride from different precursors by fractional thermal Polymerization Method and their visible light induced photocatalytic activities
    Journal of Alloys and Compounds, 2018
    Co-Authors: Zhihuan Zhao, Jimin Fan, Yongqiang Xue, Honghong Chang, Yuji Masubuchi, Shu Yin
    Abstract:

    Abstract Graphitic carbon nitride(g-C3N4) polymer was successfully synthesized by a fractional thermal Polymerization Method using melamine, guanidine carbonate and dicyandiamide as precursors. The detailed characterization was carried out by TG-DTG, XRD, SEM, PL, DRS, XPS and BET. The photocatalytic performance was determined by degradation of methyl orange(MO) under visible light irradiation. g-C3N4 obtained from different raw materials and temperature showed different band gap, morphology and photocatalytic activities. The g-C3N4 could be obtained by the Polymerization reaction of melamine, guanidine carbonate or dicyandiamide at 515, 550 or 515 °C, respectively. The treatment temperature affected the final properties of the g-C3N4 particles. The g-C3N4-M(melamine, 600 °C), g-C3N4-D(dicyandiamide, 590 °C) and g-C3N4-G (guanidine carbonate, 550 °C) particles showed the best MO degradation photocatalytic performances under visible light irradiation (>400 nm) for 120min.

Zhihuan Zhao - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of graphitic carbon nitride from different precursors by fractional thermal Polymerization Method and their visible light induced photocatalytic activities
    Journal of Alloys and Compounds, 2018
    Co-Authors: Zhihuan Zhao, Jimin Fan, Yongqiang Xue, Honghong Chang, Yuji Masubuchi, Shu Yin
    Abstract:

    Abstract Graphitic carbon nitride(g-C3N4) polymer was successfully synthesized by a fractional thermal Polymerization Method using melamine, guanidine carbonate and dicyandiamide as precursors. The detailed characterization was carried out by TG-DTG, XRD, SEM, PL, DRS, XPS and BET. The photocatalytic performance was determined by degradation of methyl orange(MO) under visible light irradiation. g-C3N4 obtained from different raw materials and temperature showed different band gap, morphology and photocatalytic activities. The g-C3N4 could be obtained by the Polymerization reaction of melamine, guanidine carbonate or dicyandiamide at 515, 550 or 515 °C, respectively. The treatment temperature affected the final properties of the g-C3N4 particles. The g-C3N4-M(melamine, 600 °C), g-C3N4-D(dicyandiamide, 590 °C) and g-C3N4-G (guanidine carbonate, 550 °C) particles showed the best MO degradation photocatalytic performances under visible light irradiation (>400 nm) for 120min.