Optical Trapping-Induced Formation of Large Cluster Domain of Amino Acids and Proteins

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  • SUGIYAMA Teruki
    Instrument Technology Research Center, National Applied Research Laboratories
  • YUYAMA Ken-ichi
    Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University
  • MASUHARA Hiroshi
    Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University

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  • 輻射圧によるアミノ酸及びタンパク質の巨大クラスター集合体の創成
  • 輻シャアツ ニ ヨル アミノサン オヨビ タンパクシツ ノ キョダイ クラスター シュウゴウタイ ノ ソウセイ

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Abstract

This paper presents a summary and consideration of recent advances in optical trapping-induced formation of a millimeter-scale domain composed of clusters of amino acids or proteins. Molecules and/ or clusters in solution are gathered by optical trapping into a one-micrometer focal volume, where local concentration is increased. The increase in local concentration overcomes an energy barrier leading to liquid-liquid phase separation, and then the local resultant domain extends into a millimeter-scale due to interactions with molecules/clusters of surroundings, eventually forming a millimeter-scale cluster domain characteristic of optical trapping. Crystallization is induced through the domain formation, and growth rate and polymorphism are governed by concentration and orientation of clusters in the domain depending on laser polarization direction. This domain represents a new material state with high potential for application in laser trapping.

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