This item: Whatman 10443421 ZapCap Cellulose Regenerated Bottletop Filter Unit, Nylon Membrane, 0.2 Micron, 500mL Volume (Pack of 12) $110.00 ($9.17/Filter Unit) In stock.
For most laboratory applications, a 0.2um or 0.22um pore size is sufficient for most media sterilization, as well as for bacteria and other particle removal larger than 0.2um in diameter. However, if you need to remove larger or a wider range of bacteria, or particles more than 0.45um in diameter, look for a syringe filter with a 0.45um pore size.
Ideal for the filtration of HPLC solutions, the Whatman ZapCap-CR is a chemical-resistant bottle-top filter for your more agressive chemical samples. Furnished as a complete 500ml unit with a convenient tubing nozzle. Includes a borosilicate prefilter for high flow rates. The connection seals on to any standard bottle 33-45mm. Can be used up to
A stock solution (1x10-2 M) was prepared for all three compounds (DMP, DEP, and DBP). Concentrations of 3 mM, 5 mM, and 7 mM standard samples for all three compounds were prepared from the stock solutions. Some amount of these solutions was filtered through a Millipore filter (0.45µm, filter syringes) and transferred into an HPLC vial.
Filtration products by Merck. At Analytics-Shop you find a large selection of membrane filters and syringe filters by Merck Millipore. We offer a broad variety of different filter membranes of high quality, e.g. Merck Millipore millex syringe filters and ominpore or isopore membrane filters by Merck Millipore.
Different grades of filter paper are available for performing various laboratory applications including routine lab work, ranging from coarse to fine filtration of particulates. VWR offers a wide range of qualitative and quantitative filter papers with varying pore size, particle retention, flow rate and filtration times.
Sample Preparation by Filtration. Filtration is a separation technique used to concentrate or purify substances based on their physical or chemical properties. It is a simple and routine method used in many laboratories to remove insoluble particles from solutions and to prepare samples for analysis. Filtration is used to reduce sample
Approximately 0.5-1 mL sample concentrate was passed through a Gelman GA-8 (0.2 ilm) filter and into a 2 mL glass vial. A 0.10 mL aliquot of filtered sample was placed in a small glass culture tube, followed by 0.90 mL 0.025M borate buffer, 0.90 mL LC grade acetone, and 0.10 mL 0.01M 9-fluorenylmethyl chloroformate (FMOCC1; Aldrich) in ace-tone.
0.03M potassium dihydrogen phosphate buffer pH 3.0: acetonitrile (55:45). The mobile phase flow rate was .8ml/min, injection volume 10µL and run time was 10 min. The analysis was performed at 230nm, using mobile phase as diluent. The standard solutions of dif-ferent concentrations were filled in vials and kept in autosampler.
Filtering using 0.22um filter does not remove the color (but some of it is stuck to the filter). 10min spin at 20 000rcf produces fragile brown pellet and longer centrifuge time (combined with