Good morning Frank On a related idea, do you typically use a limited number of "buffers" (buffer plus salt) for the final purification step of your proteins?
If so, do you have a chart of where salt crystals may appear in the screens that you use most often? Could you put that chart on your web site to help the community? People could pick one of your standard buffer mixes to make their lives easier later on. Best wishes Patrick On 8 February 2013 07:18, Frank von Delft <[email protected]>wrote: > Test the diffraction - that's the only way. But given the other junk in > the drop, chances are they're salt. > > (And don't post 5Mb attachments, please.) > > > On 07/02/2013 22:24, amro selem wrote: > > > > > > Hallo my colleagues. > i hope every one doing ok . i did screening since two weeks . i noticed > today this crystals. i don`t know either it salt or protein crystal . my > protein has zero tryptophan so i could distinguish by UV camera. > the condition was conditions: > 0.1M SPG buffer pH 8 and 25%PEG 1500. in addition to Nickle chlorid 1mM. > > > best regards > Amr > > > > > > > > -- [email protected] Douglas Instruments Ltd. Douglas House, East Garston, Hungerford, Berkshire, RG17 7HD, UK Directors: Peter Baldock, Patrick Shaw Stewart http://www.douglas.co.uk Tel: 44 (0) 148-864-9090 US toll-free 1-877-225-2034 Regd. England 2177994, VAT Reg. GB 480 7371 36
