to be generated and subjected to a wide range of downstream biochemical and analytical techniques (e.g., protein electrophoresis, enzyme activity measurement, NMR, many types of chromatography and mass spectrometry). Leaf AWF is also useful as an apoplast mimicking growth medium for studying the interaction of plant colonizing microbes with their environment . In the following protocols we describe how to perform the infiltration-centrifugation technique using Phaseolus vulgaris cv. Tendergreen leaves, and provide some examples of downstream analyses with a focus on metabolomics. Importantly, methods to assess the quality of AWF are provided along with advice to optimize the procedure for different leaf types.