We describe the preliminary multi-parameter classification of ground coffee with NIR analysis using a Brimrose Luminar 5030 handheld analyser. Commercial coffee capsules of different variety were purchased and used for the analysis. NIR spectra were acquired aiming at distinguishing the different types of coffee as well as the caffeine content and the chlorogenic acids content. This preliminary analysis suggests that NIR analysis is able to segregate ground coffee according to all these parameters. We anticipate that with further data and modelling a finer classification may be possible, particularly the classification of ground coffee or coffee beans according to the sensory perception of the flavour.

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NIR analysis of ground coffee:
preliminary multi-parameter
classification
Daniel Pelliccia
Instruments & Data Tools

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Instruments & Data Tools: products and capabilities
3D IMAGING3D ANALYSIS
NIR
ANALYSERS
by BRIMROSE

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Outline
1. The instrument: Brimrose Luminar 5030
2. Samples: coffee capsules
3. Results and discussion: Principal Component Analysis
4. Conclusion

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The instrument: Brimrose AOTF analyser Luminar 5030
The Luminar 5030 spectrometer is based on an
Acousto-Optic Tunable Filter (AOTF).
NIR region 1100 nm - 2300 nm
Resolution 2 nm
Gain 1x
Scans Per Average 100
Acquisition mode Reflectance
Acquisition parameters

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Samples: coffee capsules Aldi Expressi
DISCLAIMER: Instruments & Data Tools did not receive any compensation, nor free samples from Aldi Australia or its parent company. We
chose Aldi Expressi coffee capsules due to its large available selection and the possibility to compare NIR data to an external intensity scale.
The data and comments provided here are not influenced by Aldi Australia in any way.
Name Intensity Roast Variety
Tauro 5 Medium Arabica
Renzo 8 Medium-dark Arabica
Reggio 9 Medium-dark NA
La Spezia 11 Dark Arabica + Robusta
Torino 11 Dark Arabica
Abruzzo 12 Dark Arabica + Robusta
Calabrese 13 Dark Arabica + Robusta

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Data analysis: Principal Components Analysis
- We captured 10 spectra for each sample. Each spectrum is the average of 20
readings
- Total of 70 spectra were analysed by PCA and 3D scatter plots of the 3 principal
components were produced
Spectrum 1
Spectrum 2
Spectrum 3
Spectrum
70
PCA
PC1
, PC2
, PC3
PC1
, PC2
, PC3
PC1
, PC2
, PC3
PC1
, PC2
, PC3
3D scatter plot

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Can we distinguish between capsules?

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Can we sort capsules based on caffeine content?

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Can we sort capsules based on acidity content?

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Conclusion
● Preliminary classification of coffee capsules according to different parameters can be
accomplished by NIR analysis using a Brimrose Luminar 5030 handheld analyser.
● The goal of this approach is to provide data to sensory evaluation of coffees.
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