Comprehensive investigation of psicose in Chinese honeys and the assessment of its potential as a new marker for honey adulteration detection

•Psicose was investigated comprehensively in Chinese honeys and syrups.•Psicose was not detected in any honey samples except for some Jujube honeys.•69.0 % of syrup samples were detected.•Psicose can be a new marker for honey adulteration detection except for Jujube honey.