Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (6): 20220758.doi: 10.7503/cjcu20220758

• Analytical Chemistry • Previous Articles     Next Articles

Sensitive Detection of L⁃Arginine Using Peptide Aptamer Functionalized Nanochannel

CAO Zhong1, GUO Peixian1, XUE Shulei1, XIAO Zhongliang1, TAN Shuqi1, KANG Xuan1, FENG Zemeng2, YIN Yulong2, MA Tianji1()   

  1. 1.Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation,Hunan Provincial Key Laboratory of Cytochemistry,School of Chemistry and Chemical Engineering,Changsha University of Science and Technology,Changsha 410114,China
    2.Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China
  • Received:2022-12-13 Online:2023-06-10 Published:2023-02-14
  • Contact: MA Tianji E-mail:mtjbj2008@163.com
  • Supported by:
    the National Natural Science Foundation of China(22204007);the Scientific Research Fund of Hunan Provincial Education Department, China(21A0182)

Abstract:

Amino acids are the source of life, in which L⁃arginine(L⁃Arg) is not only an important amino acid for metabolism in organisms, but also one of the important tumor markers. It is very important to develop highly selective methods for the detection of L⁃Arg in the field of bioanalysis. The polypeptide sequence specifically binding to L⁃Arg (sequence CFGHIHEGY) was screened from 29185 protein sequences in Uniprot database and was immobilized on the tip surface of bullet shaped nanochannel as a recognition element. Under the nanoconfined effect, the conformational change from extended state to curled state before and after the specific binding of peptides to L⁃Arg was used to control the effective pore size of nanochannel, resulting in the change of nanopore conductivity, which realize the selective detection of L⁃Arg. The experimental results show that the polypeptide modified nanochannel has high sensitivity and selectivity for L⁃Arg, the linear range is 1—100 nmol/L, and the limit of detection is as low as 1 nmol/L. This research provides a new method for sensible and highly selective amino acid sensing and also provides a new idea for designing peptide functionalized bio-inspired ionic channel.

Key words: Nanopore, Ionic channel, Nanoconfined effect, Peptide aptamer, Detection of L?arginine

CLC Number: 

TrendMD: