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Super-sensitive Raman spectroscopy by fluorescence encoding

Research Project

Project/Area Number 20K15227
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 32010:Fundamental physical chemistry-related
Research InstitutionThe University of Tokyo

Principal Investigator

Hiramatsu Kotaro  東京大学, 大学院理学系研究科(理学部), 助教 (60783561)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Discontinued (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords蛍光エンコーディング / ラマン分光法 / 振動分光法 / 蛍光 / 一分子計測 / 高感度分光法
Outline of Research at the Start

ラマン分光法は分子に光を照射するだけで分子振動スペクトルを取得できる優れた分析手法であるが,その信号強度は蛍光と比べ5桁以上低く,低濃度のサンプルの測定は困難である.短パルスレーザーを用いたコヒーレントラマン散乱を用いると信号強度を増強できるが,依然として1 mM - 100 μM程度が典型的な検出限界である.本研究提案では,ラマン活性な分子振動を時間領域で、蛍光を介して測定する手法の開発を行う.本手法では,測定できる分子は蛍光性分子に限られるが,nMレベルの感度での分子振動測定が可能になると期待される.

Outline of Final Research Achievements

Fluorescence-encoded time-domain coherent Raman spectroscopy (FLETCHERS) was developed by combining time-domain Raman spectroscopy and fluorescence encoding to achieve highly sensitive Raman spectroscopy in the low-frequency region (200-750 cm-1). FLETCHERS is a time-domain coherent Raman spectroscopy technique that uses a single ultrashort pulse of light to excite molecular vibrations and measure the temporal evolution of the vibrations by changing the intensity of the fluorescence measured by another ultrashort pulse of light. We have demonstrated that it is possible to measure the vibrational spectrum of Rhodamine 800 in a solution with a concentration of 250 nM.

Academic Significance and Societal Importance of the Research Achievements

ラマン分光法は化学分析やバイオイメージングにおける計測モダリティとして広く用いられている.ラマン分光は無標識に分子構造情報を得られる強力な手法である一方で,その感度の低さから応用範囲が限定されている.本研究で開発したFLETCHERSは蛍光分子の振動スペクトルを高感度に検出でき,バイオイメージングの多色化,材料中の欠損の評価,1分子レベルでの環境ゆらぎの検出などへの応用が期待される.

Report

(2 results)
  • 2022 Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2021 2020

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] High-Throughput Raman Flow Cytometry and Beyond2021

    • Author(s)
      Gala de Pablo Julia、Lindley Matthew、Hiramatsu Kotaro、Goda Keisuke
    • Journal Title

      Accounts of Chemical Research

      Volume: 54 Issue: 9 Pages: 2132-2143

    • DOI

      10.1021/acs.accounts.1c00001

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dual-Comb Coherent Raman Spectroscopy with near 100% Duty Cycle2020

    • Author(s)
      Kameyama Risako、Takizawa Shigekazu、Hiramatsu Kotaro、Goda Keisuke
    • Journal Title

      ACS Photonics

      Volume: 8 Issue: 4 Pages: 975-981

    • DOI

      10.1021/acsphotonics.0c01656

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Fast, sensitive dual-comb CARS spectroscopy with a quasi-dual-comb laser2021

    • Author(s)
      Risako Kameyama, Sigekazu Takizawa, Kotaro Hiramatsu, Keisuke Goda
    • Organizer
      High-Speed Biomedical Imaging and Spectroscopy VI, Photonics West
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fluorescence-encoded time-domain coherent Raman spectroscopy through single-photon counting2021

    • Author(s)
      Phillip Charles McCann, Kotaro Hiramatsu, Keisuke Goda
    • Organizer
      Single Molecule Spectroscopy and Superresolution Imaging XIV, Photonics West
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 擬デュアルコム光源による高速コヒーレントラマン分光法2021

    • Author(s)
      亀山 理紗, 滝沢 繁和, 平松 光太郎, 合田 圭介
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] High-speed low-frequency vibrational spectroscopy using a Sagnac interferometer2021

    • Author(s)
      Jorgen Walker Peterson, Matt Lindley, Julia Gala de Pablo, Kotaro Hiramatsu, Keisuke Goda
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] ラベルフリー代謝工学に向けたラマンフローサイトメーターの開発2020

    • Author(s)
      中尾 龍二, 平松 光太郎, 橋爪里奈, 那須 雄介, Robert E. Campbell, 合田 圭介
    • Organizer
      量子生命科学会 第二回大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 繰り返し周波数変調による高速コヒーレントラマン分光法2020

    • Author(s)
      亀山 理紗子, 平松 光太郎, 合田 圭介
    • Organizer
      分子科学会オンライン討論会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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