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Filtration of biological liquids has been widely employed in biological, medical, and environmental investigations due to its convenience; many could be performed without energy and on-site, particularly protein separation. However, most available membranes are universal protein absorption or sub-fractionation due to molecule sizes or properties. SPMA, or syringe-push membrane absorption, is a quick and easy way to prepare biofluids for protein evaluation.

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Plant Molecular Biology (Botany), Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany.

Due to their endosymbiotic origin, chloroplasts harbor several subcompartments and membrane systems. Each of these has a different protein and lipid composition that dynamically changes either naturally during plant development or induced by environmental stimuli. Here, we describe a protocol for chloroplast envelope membrane subfractionation via discontinuous sucrose gradients, which offers the possibility to separate the different plastid subcompartments for several downstream applications.

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