creating a food database using atr by alejandro blinder sponsored by dr. m. salim diab
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Creating a food database using ATR
by
Alejandro Blinder
Sponsored by Dr. M. Salim Diab
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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.
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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
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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
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• 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
Libraries in general
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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
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Project set up
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Project set up
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Data obtained
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Data obtained
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Data obtained
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Data obtained
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Reliable data
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Problems found
• Inconsistency (pressure)
– Lead to bad data
– Low match ups
• Time consuming
– Each sample was run several times
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Low match ups
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Problem solved
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Problem solved
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Problem solved
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Problem Solved
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Second part
• Data Boundaries were tested
– Blends samples
– Mix samples
• Own make
• Found in the market
• Decent data was obtained
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Red pepper blend
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Red pepper blend
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Tomato Blend
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Three Cheese Tomato sauce
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Tomato sauce w/pepper (jewel)
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Carrot and orange juice (mistic)
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Carrot juice (Odwalla)
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Tomato and Red pepper Blend
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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
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Thank You!
Questions?