Those small LC columns need a better filter. So Rheodyne made one. small columns. The Rheodyne 7315 for microbore columns. And the Rheodyne 7335 for short high-speed columns. They're identical except for a tiny internal filter element. The accompanying chromatograms show the dramatic improvement in resolu tion that occurs when a new low-dispersion filter is used in place of a conventional filter. For more about these new column inlet filters-plus our Tech Note 6 describ ing the experimental effect of filters on resolution-contact Rheodyne, Inc., PO. Box 996, Cotati, California 94928, U.S.A. Phone (707) 664-9050.
We're talking about those 1-mm or 2-mm microbore columns and short high-speed columns. Like larger conventional columns, they should have an inlet filter to protect them from particle contamination. Unlike conventional columns, they are highly sensitive to sample dispersion within this filter. Filter sample dispersion that has little effect on the resolution of a con ventional column can seriously reduce the resolution of a small column. To remedy this situation, Rheodyne made two low-dispersion filters designed especially to preserve the resolution of
LEFT Conventional filter with 1 mm χ 300 mm column. RIGHT Rheodyne 7315 low-dispersion filter with 1 mm χ 300 mm column.
RHEODYNE T H E LC C O N N E C T I O N C O M P A N Y
CIRCLE 175 ON READER SERVICE CARD
