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(a,b) Purity and (c) concentration graphs of bacterial gDNA obtained from 2.5 mL of blood spiked with E. coli O157:H7 at different concentrations (101–103 CFU/mL) using the W-shaped microchannels with and without a conical microchamber. Absorbances of protein, chemical and DNA are 280 nm, 230 nm and 260 nm, respectively. Student’s t-test. *: P < 0.05. n = 3.
