Microfluidic concentration gradient generators(µ-CGGs)have been utilized to identify optimal drug compositions through antimicrobial susceptibility testing(AST)for the treatment of antimicrobial-resistant(AMR)inf...Microfluidic concentration gradient generators(µ-CGGs)have been utilized to identify optimal drug compositions through antimicrobial susceptibility testing(AST)for the treatment of antimicrobial-resistant(AMR)infections.Conventionalµ-CGGs fabricated via photolithography-based micromachining processes,however,are fundamentally limited to two-dimensional fluidic routing,such that only two distinct antimicrobial drugs can be tested at once.This work addresses this limitation by employing Multijet-3D-printed microchannel networks capable of fluidic routing in three dimensions to generate symmetric multidrug concentration gradients.The three-fluid gradient generation characteristics of the fabricated 3Dµ-CGG prototype were quantified through both theoretical simulations and experimental validations.Furthermore,the antimicrobial effects of three highly clinically relevant antibiotic drugs,tetracycline,ciprofloxacin,and amikacin,were evaluated via experimental single-antibiotic minimum inhibitory concentration(MIC)and pairwise and three-way antibiotic combination drug screening(CDS)studies against model antibiotic-resistant Escherichia coli bacteria.As such,this 3Dµ-CGG platform has great potential to enable expedited combination AST screening for various biomedical and diagnostic applications.展开更多
基金This project was funded through the Berkeley Sensors and Actuators Center(BSAC)at UC Berkeley.
文摘Microfluidic concentration gradient generators(µ-CGGs)have been utilized to identify optimal drug compositions through antimicrobial susceptibility testing(AST)for the treatment of antimicrobial-resistant(AMR)infections.Conventionalµ-CGGs fabricated via photolithography-based micromachining processes,however,are fundamentally limited to two-dimensional fluidic routing,such that only two distinct antimicrobial drugs can be tested at once.This work addresses this limitation by employing Multijet-3D-printed microchannel networks capable of fluidic routing in three dimensions to generate symmetric multidrug concentration gradients.The three-fluid gradient generation characteristics of the fabricated 3Dµ-CGG prototype were quantified through both theoretical simulations and experimental validations.Furthermore,the antimicrobial effects of three highly clinically relevant antibiotic drugs,tetracycline,ciprofloxacin,and amikacin,were evaluated via experimental single-antibiotic minimum inhibitory concentration(MIC)and pairwise and three-way antibiotic combination drug screening(CDS)studies against model antibiotic-resistant Escherichia coli bacteria.As such,this 3Dµ-CGG platform has great potential to enable expedited combination AST screening for various biomedical and diagnostic applications.
