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  • Packets
  • Since such packets may resemble sachets of sugar or salt and because silica gel may have added toxic chemical indicators (see below), silica gel packets usually bear warnings for the user not to eat the contents. (wikipedia.org)
  • Through the inclusion of silica gel packets, these items can be preserved longer. (wikipedia.org)
  • chemistry
  • citation needed] The synthetic route for producing silica gel was patented by chemistry professor Walter A. Patrick at Johns Hopkins University in 1918. (wikipedia.org)
  • powder
  • Stabilizing silica gel - non-crystalline micro-porous solid powder, nontoxic, flame-resisting, used in brewery of grains for beer to improve taste, clearness, color and foam, removal of non-micro-organism impurities. (wikipedia.org)
  • moisture
  • Silica Gel For Moisture Absorber About Silica Gel: Moisture absorber are extremely useful in homes as they inhibit the growth of mildew and mold on food items. (list.ly)
  • In World War II, silica gel was indispensable in the war effort for keeping penicillin dry, protecting military equipment from moisture damage[citation needed], as a fluid cracking catalyst for the production of high octane gasoline, and as a catalyst support for the manufacture of butadiene from ethanol, feedstock for the synthetic rubber program. (wikipedia.org)
  • When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH4)2CoCl4 or cobalt chloride CoCl2 is added. (wikipedia.org)
  • common
  • It is common for a small compressed air system (similar to a small home aquarium pump) to be employed to circulate the air inside the waveguide over a jar of silica gel. (wikipedia.org)
  • bubbles
  • When running agarose or polyacrylamide gels, bubbles mean the electrodes are connected, plugged in, and that current is flowing. (bitesizebio.com)
  • Bubbles clog columns , affect flow rates and affect purity by preventing a direct interaction with the column. (bitesizebio.com)
  • several
  • The productivity of chromatography can be increased by running several columns at a time. (wikipedia.org)
  • Sealed chromatography cartridges or columns work similarly except the sample and buffer is pumped into and through the resin by an external device such as a liquid chromatographic (LC) system, also requiring collection and monitoring of several fractions. (wikipedia.org)
  • often
  • In order to eliminate the time and monitoring assorted with drip columns, fractions often equal to the full exclusion volume of the column are collected regardless of sample volume resulting in significant dilution of sample. (wikipedia.org)
  • For practical purposes, silica gel is often interchangeable with silica xerogel. (wikipedia.org)
  • usually
  • The stationary phases are usually finely ground powders or gels and/or are microporous for an increased surface, though in EBA a fluidized bed is used. (wikipedia.org)
  • Volume
  • Molecules that are significantly smaller than the MWCO penetrate into the pores of the resin, while molecules larger than the MWCO are unable to enter the pores and remain together in the void volume of the column. (wikipedia.org)
  • By passing samples through a column resin bed with sufficient length and volume, macromolecules can be fully separated from small molecules that travel a greater distance though the pores of the resin bed. (wikipedia.org)