Macroscale fluorescence imaging against autofluorescence under ambient light  

作　　者：Ruikang Zhang Raja Chouket Marie-Aude Plamont Zsolt Kelemen Agathe Espagne Alison G.Tebo Arnaud Gautier Lionel Gissot Jean-Denis Faure Ludovic Jullien Vincent Croquette Thomas Le Saux 

机构地区：[1]PASTEUR,Département de Chimie,École Normale Supérieure,PSL University,Sorbonne Université,CNRS,75005 Paris,France [2]Institut Jean-Pierre Bourgin,INRA,AgroParisTech,CNRS,Saclay Plant Science(SPS),UniversitéParis-Saclay,Versailles,France [3]Laboratoire de Physique Statistique,École Normale Supérieure,PSL Research University,UniversitéParis Diderot Sorbonne Paris-Cité,Sorbonne Université,CNRS,75005 Paris,France [4]Institut de biologie de l’École normale supérieure(IBENS),École Normale Supérieure,CNRS,INSERM,PSL Research University,75005 Paris,France

出　　处：《Light(Science & Applications)》2018年第1期151-162,共12页光（科学与应用)（英文版）

基　　金：supported by the ANR(France BioImaging—ANR-10-INBS-04,Morphoscope2—ANR-11-EQPX-0029);the SATT Lutech(OPIOM);the Fondation de la Recherche Médicale(FRM);the LabEx Saclay Plant Sciences-SPS(ANR-10-LABX-0040-SPS);the“Investments for the Future”program(ANR-11-IDEX-0003-02);the Mission Interdisciplinaritédu CNRS;the Domaine d’Intérêt Majeur Analytics de la Région Ile de France(DREAM).

摘　　要：Macroscale fluorescence imaging is increasingly used to observe biological samples.However,it may suffer from spectral interferences that originate from ambient light or autofluorescence of the sample or its support.In this manuscript,we built a simple and inexpensive fluorescence macroscope,which has been used to evaluate the performance of Speed OPIOM(Out of Phase Imaging after Optical Modulation),which is a reference-free dynamic contrast protocol,to selectively image reversibly photoswitchable fluorophores as labels against detrimental autofluorescence and ambient light.By tuning the intensity and radial frequency of the modulated illumination to the Speed OPIOM resonance and adopting a phase-sensitive detection scheme that ensures noise rejection,we enhanced the sensitivity and the signal-to-noise ratio for fluorescence detection in blot assays by factors of 50 and 10,respectively,over direct fluorescence observation under constant illumination.Then,we overcame the strong autofluorescence of growth media that are currently used in microbiology and realized multiplexed fluorescence observation of colonies of spectrally similar fluorescent bacteria with a unique configuration of excitation and emission wavelengths.Finally,we easily discriminated fluorescent labels from the autofluorescent and reflective background in labeled leaves,even under the interference of incident light at intensities that are comparable to sunlight.The proposed approach is expected to find multiple applications,from biological assays to outdoor observations,in fluorescence macroimaging.

关 键 词：AMBIENT ILLUMINATION LIGHT 

分 类 号：O62[理学—有机化学]