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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 ATRbyAlejandro BlinderSponsored 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. • Energy Beam penetrates the sample and the reflected energy is analyzed • Spectroscopy: interaction of energy with the sample to perform analysis.
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
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
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
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
Problems found • Inconsistency (pressure) • Lead to bad data • Low match ups • Time consuming • Each sample was run several times
Second part • Data Boundaries were tested • Blends samples • Mix samples • Own make • Found in the market • Decent data was obtained
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