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Vibrational Spectroscopy for Rapid, Quantitative Analysis of

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Daniel Killeen

on 1 December 2013

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Transcript of Vibrational Spectroscopy for Rapid, Quantitative Analysis of

Vibrational Spectroscopy for Rapid, Quantitative Analysis of Hops (Humulus lupulus L.)
What are they!?
Up Close
Chemistry
Bittering
Analysis of Hops Bitter Acids
UV Spectrophotometry - Alpha and Beta Acids
HPLC - More Specific
(Cohumulone and Colupulone)
Both require solvent extractions
Waste; time consuming; trained analyst
What do the Breeders Need from an Analytical Method?
1. Minimal Sample Preparation
2. Rapid analysis
Accurate? Precise?
- Not Necessarily!
Visual Inspection
THOUSANDS of Cultivars
Limited Harvest Period
Analytical Vibrational Spectroscopy
IR, NIR and Raman
Complementary Information
Pros and Cons with each
Regression Modeling
Partial Least Squares Regression (PLS-R)
Relates Spectral Variability to Reference Data to generate model
Model is used to predict unknowns
All are FAST!
3. Cheap
4. Safe
5. Simple
Grouping of like Varieties
Hops and Beer
NIR, IR and Raman
Similar Results
Fast, quantitative, portable
Streamlining Breeding Programs
Questions?
Nagel et al Plant Cell 2008
Raman Spectra of Hops Samples
Flavor and Aroma
Plant & Food Research
Breeding world renown hops varieties here in Motueka
Aroma: Pacifica, Motueka and Cascade
Alpha: Pacific Jade, Pacific Gem and Southern Cross
High Alpha? Low Total Bitter Acids?
139 Hops Samples
0 - 3500 cm-1
7 min Analysis time
4cm-1 Resolution
1064 nm FT-Raman
Extracts PLS Factors (Not PCs)
Full transcript