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Creating a food database using ATR by Alejandro Blinder Sponsored by Dr. M. Salim Diab

Creating a food database using ATR by Alejandro Blinder Sponsored by Dr. M. Salim Diab. What is Attenuated Total Reflectance (ATR) ?. Single-reflection accessory of the Fourier Transform Infra Red (FT-IR) Electromagnetic radiation in the infrared range.

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Creating a food database using ATR by Alejandro Blinder Sponsored by Dr. M. Salim Diab

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  1. Creating a food database using ATRbyAlejandro BlinderSponsored by Dr. M. Salim Diab

  2. What is Attenuated Total Reflectance (ATR) ? • Single-reflection accessory of the Fourier Transform Infra Red (FT-IR) • Electromagnetic radiation in the infrared range. • Energy Beam penetrates the sample and the reflected energy is analyzed • Spectroscopy: interaction of energy with the sample to perform analysis.

  3. Why is ATR important for the spectroscopy field? • Advance equipment to analyze samples • Any sample can be analyze but gases • Quick method for unknown identification • Sample is conserved • Low amount of sample is required • Computer analyze the samples for you

  4. Libraries in general • Data base of samples • Work is still being done • Some examples: flavors, fragrance, dyes, pigments, drugs, food packaging, food additives, aldehydes, ketones, esters, pesticides, etc. • Two big companies: Aldrich, S.T. Japan

  5. Libraries in general • Libraries are in big demand • They can be very expensive • Most libraries generated by transmission (IR) lead to unsatisfactory results • Intensity differences because of penetration depth • Dispersion • Transmission artifacts

  6. Research Project • Two parts: • First: Create a reliable ATR library on Food • Second: Test the boundaries of the library • First part: • Ten samples where analyzed: white bread, mushroom, celery, cauliflower, tomato, cucumber, olive, carrot, red pepper, and lettuce

  7. Project set up

  8. Project set up

  9. Data obtained

  10. Data obtained

  11. Data obtained

  12. Data obtained

  13. Reliable data

  14. Problems found • Inconsistency (pressure) • Lead to bad data • Low match ups • Time consuming • Each sample was run several times

  15. Low match ups

  16. Problem solved

  17. Problem solved

  18. Problem solved

  19. Problem Solved

  20. Second part • Data Boundaries were tested • Blends samples • Mix samples • Own make • Found in the market • Decent data was obtained

  21. Red pepper blend

  22. Red pepper blend

  23. Tomato Blend

  24. Three Cheese Tomato sauce

  25. Tomato sauce w/pepper (jewel)

  26. Carrot and orange juice (mistic)

  27. Carrot juice (Odwalla)

  28. Tomato and Red pepper Blend

  29. Conclusion • ATR useful tool for the spectroscopy field • ATR libraries are needed • Use of IR libraries lead to unsatisfactory results • Only two companies are investing in this field • Research project was good overall • Reliable data • Decent for mix samples • For the future • Expand library • Keep testing the boundaries of library

  30. Thank You!Questions?

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