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Measurement of 100 ppb standard IPA gas by the previous (black) and the modified (red) bio-sniffer. The modified bio-sniffer showed the signal is higher than with the previous one by 152%, and the S/σN ratio increased from 165.2 to 376.1. The broader area of the flow cell leads to detection of more NADH for the same IPA concentration but also results in a longer time response and recovery time.
