The "goodness" of the method highly depend on the starting material and your expectations on purity, yield etc. One of my favourite protocol is the following, because it contains some very smart steps and could be performed without ultracentrifuge:
http://link.springer.com/article/10.1023%2FA%3A1007487806583
But if the goal is to obtain high purity organelles, it is better to chose gradient centrifugation. It is also important, whether you need functional organelles or you just extract protein or nucleic acids.
Thank u too much, my goal is to obtain high purity organelles to extract enzymes. Plz suggest some more gradient based protocols and also the protocols to check the purity of fractions.
Unfortunately, I never worked with maize, and my goal was always to extract organellar nucleic acids. But I have some suggestions ingeneral. For high purity organelles, you can use either suchrose, or Percoll gradient. The latter gives you superior quality. Also, I found it important, to dark-adapt the plants, before fractionation. This helps to corrode starch granules in plastids, so that they really sediment by shape, not because the are heavy. Never use quartz sand for homogenization, because the sharp particles destroy organelles. Here is some literature, hope you find it helpful.
http://webdoc.nyumc.org/nyumc/files/sun-lab/attachments/CPCB.ch03.Cell%20Fractionation.pdf
http://www.nature.com/nprot/journal/v2/n3/abs/nprot.2007.58.html
http://www.ncbi.nlm.nih.gov/pubmed/20045215
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