{"id":2743,"date":"2022-06-03T21:21:37","date_gmt":"2022-06-03T13:21:37","guid":{"rendered":"https:\/\/trithuctretw.com\/?p=2743"},"modified":"2022-06-17T22:51:49","modified_gmt":"2022-06-17T14:51:49","slug":"tong-hop-dan-xuat-polynorbornene-voi-kha-nang-phong-thich-hydro-sulfide-bang-phan-ung-trung-hop-romp","status":"publish","type":"post","link":"https:\/\/www.trithuctretw.com\/en\/tong-hop-dan-xuat-polynorbornene-voi-kha-nang-phong-thich-hydro-sulfide-bang-phan-ung-trung-hop-romp\/","title":{"rendered":"Synthesis of polynorbornene derivatives with the ability to release hydrogen sulfide by ROMP polymerization"},"content":{"rendered":"
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Journal<\/strong>:
European Polymer Journal<\/em><\/p>\n\n\n\n

IF:<\/strong> 4.598 (2021)<\/em><\/p>\n\n\n

\"SCImago<\/a><\/p>\n\n\n\n

DOI:<\/strong>
10.1016\/j.eurpolymj.2022.111294<\/a><\/strong><\/em><\/p>\n\n\n\n

Keywords:<\/strong>
Hydrogen sulfide, Polymeric micelles, H2<\/sub>S donor, SATO, ROMP<\/em><\/p>\n<\/div>\n\n\n\n

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Polynorbornene\u2010derived block copolymer micelles via ring\u2010opening metathesis polymerization with capacity of hydrogen sulfide generation<\/strong><\/p>\n\n\n\n

Trong-Nghia Le, Huang Ru, Cheng-Kang Lee, N.Vijayakameswara Rao<\/em><\/strong><\/p>\n\n\n\n

Dr. Le Trong Nghia, Department of Chemical Engineering, National Taiwan University of Science and Technology, Taiwan; Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan. Email: tnle@gate.sinica.edu.tw, letrongnghia720@gmail.com<\/em><\/p>\n\n\n\n

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Summary of scientific publications<\/h2>\n<\/div>\n\n\n\n
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PDF<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n

Since the 1990s, hydrogen sulfide (H2<\/sub>S) has been recognized as one of the gaseous signaling molecules (gasotransmitters) besides nitric oxide (NO) and carbon monoxide (CO). NO is the most widely studied gasotransmitter and has been shown to reduce blood pressure through vasodilation. Meanwhile, CO does not appear to be an attractive target in pharmaceutical research. As for H2<\/sub>S, currently there are very few studies focusing on it. H2<\/sub>S can react with many reactive oxygen species (ROS), for example peroxynitrite (ONOO\u2212<\/sup>), superoxide radical anion (\u00b7<\/sup>O2<\/sub>\u2212<\/sup>), hypochlorite (ClO\u2212<\/sup>) and hydrogen peroxide (H2<\/sub>O2<\/sub>). H2<\/sub>S has been shown to have many biological effects, including vasodilation, antioxidant, cellular protection against oxidative stress, anti-inflammatory and anti-cancer effects.<\/p>\n\n\n\n

To study the biological effects of the above mentioned gasotransmitters, donor substances need to be synthesized and can release NO, CO or H.2<\/sub>S under physiological conditions for a specified period of time. There are many types of molecules that can release NO, CO or H2<\/sub>S under certain conditions with different half-lives. S-aroylthiooxime (SATO) is an example.<\/p>\n\n\n\n

However, the ability to release gasotransmitter molecules is often non-selective or rate-controlled. This can be improved by attaching substances capable of releasing H2<\/sub>S (H2<\/sub>S donor) into the polymer. These polymers will form nano-sized particles, protecting and releasing H molecules2<\/sub>S under certain conditions. However, H-releasing polymers2<\/sub>S remains largely unexplored. Very few polymers are capable of releasing H2<\/sub>S is studied for biological applications. Several polymers have been synthesized by the reversible addition\u2212 fragmentation chain-transfer polymerization (RAFT) reaction, such as PEG-b-poly(FBEMA) and PFHMA-g-PEG. Functional groups capable of releasing H2<\/sub>S is attached after the polymer is synthesized (post-polymerization). For this method, the attachment of SATO groups and polymer chains cannot be controlled precisely, leading to difficulty in controlling the H release rate.2<\/sub>S. This problem can be solved by the ROMP (ring-opening metathesis polymerization) method. ROMP is a simple tool capable of generating monodisperse polymers with precise molecular weights.<\/p>\n\n\n

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Figure 1.<\/strong> Self-assembled micelle formation and H release2<\/sub>S from PNEG-b-PNSATO.<\/figcaption><\/figure>\n<\/div>\n\n\n
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Figure 2.<\/strong> Fluorescence imaging of H release2<\/sub>S in cell L929. Scale bar: 100 \u03bcm.<\/figcaption><\/figure>\n\n\n\n

In this paper, we synthesize amphiphilic polymers (PNEG-b-PNSATO) consisting of norbornene-mPEG (Nor-mPEG) as a hydrophilic part and norbornene-conjugated SATO radical (Nor-SATO) as partially hydrophobic through ROMP. These amphiphilic block copolymers can self-assemble micelles with sizes of about 41-57 nm. The number of SATO units and molecular weight of the polymer can be controlled through the monomer to Grubbs catalyst ratio. Self-assembled micelle formation and H release2<\/sub>S under cysteine activation is illustrated in Figure 1<\/strong>. Fluorescence imaging was used to evaluate H release2<\/sub>S in cells (Figure 2<\/strong>). Additionally, PNEG-b-PNSATO polymeric micelles have been shown to protect against oxidative damage caused by high concentrations of H2<\/sub>O2 <\/sub>(Figure 3<\/strong>).<\/p>\n\n\n\n

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Figure 3.<\/strong> The ability to protect against oxidative damage caused by high concentrations of H2<\/sub>O2<\/sub> of the polymers PNEG-b-PNSATO and NaSH (positive control sample).<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

More information about the author<\/h2>\n\n\n\n

Dr. Le Trong Nghia<\/a><\/p>\n\n\n\n

<\/div>","protected":false},"excerpt":{"rendered":"

Dr. Le Trong Nghia, Department of Chemical Engineering, National Taiwan University of Science and Technology, Taiwan; Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan.<\/p>","protected":false},"author":1,"featured_media":2750,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,19],"tags":[],"class_list":["post-2743","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cong-bo-khoa-hoc","category-hoa-hoc-sinh-hoc-vat-lieu","two-columns"],"yoast_head":"\nT\u1ed5ng h\u1ee3p d\u1eabn xu\u1ea5t polynorbornene v\u1edbi kh\u1ea3 n\u0103ng ph\u00f3ng th\u00edch hydro sulfide b\u1eb1ng ph\u1ea3n \u1ee9ng tr\u00f9ng h\u1ee3p ROMP -<\/title>\n<meta name=\"description\" content=\"TS. 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