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Authors: Mobeen Arif, Steven Setford, Kerry Burton and Ibtisam Tothill Reviewer:

L-Malic acid biosensor for field-based evaluation of apple, potato and tomato horticultural produce. Authors: Mobeen Arif, Steven Setford, Kerry Burton and Ibtisam Tothill Reviewer: Bax Smith, B.Sc. (Chemistry), B.Eng. (Electrical Engineering), M.Eng. Candidate (Robotics). Today’s Talk.

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Authors: Mobeen Arif, Steven Setford, Kerry Burton and Ibtisam Tothill Reviewer:

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  1. L-Malic acid biosensor for field-based evaluation of apple, potato and tomato horticultural produce Authors: Mobeen Arif, Steven Setford, Kerry Burton and Ibtisam Tothill Reviewer: Bax Smith, B.Sc. (Chemistry), B.Eng. (Electrical Engineering), M.Eng. Candidate (Robotics)

  2. Today’s Talk • Purpose of the Paper • Why L-Malic acid Biosensor? • Characteristics of the Sensor • Electrode Composition • Performance • Inhibitors • Results from Real Testing

  3. Purpose of the Paper • Want a quick, simple and cheap way to detect if apples are ripe • Current Methods: • LC, GC • Capillary Isotachophoresis • FTIR Spectrometry • Enzymatic assay with Photometric Detection • L-Malic Acid amounts decrease as fruit ripens

  4. The Sensor

  5. Electrodes: Bare Carbon vs Rhodinised Carbon

  6. Sensor Performance

  7. Inhibition Effects

  8. Testing Real Samples

  9. Conclusion • Linear Range less than Test Kit: • 0.028-0.7mM vs 0.0038-2.5mM • Faster than Test Kit: • 6min vs 24min

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