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Laboratory plunger syringes designed for sample preparation and filtration. These syringes typically consist of low-volume (from microliters to some milliliters) plastic or glass plunger syringes that include either Luer-lock tips or fixed needles; they may also include a filter holder and a disposable membrane filter. Filters are available either to isolate biological molecules (i.e., ultrafiltration) or with a larger pore size to remove particulates from a sample or the moving phase of a chromatograph (i.e., microfiltration). Some sampling syringes are manufactured only to inject samples in a particular autosampler model.
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