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NMR-Based Authentication of Roasted Coffee Species Composition
In the highly competitive global coffee market, brand reputation is closely linked to product authenticity. A prominent international coffee roasting company approached our laboratory with a critical quality assurance objective: to verify the botanical purity of its premium roasted coffee shipments.
The client marketed its products as 100% Arabica, a premium coffee species known for its distinctive sensory profile and higher market value. However, Arabica beans typically command a significantly higher price than Robusta (Coffea canephora) beans. This price difference creates a strong financial incentive for economically motivated adulteration, including the substitution or blending of Arabica with lower-cost Robusta.
To protect brand integrity and ensure compliance with strict international labeling requirements, the client required definitive and legally defensible analytical evidence confirming the species composition of its roasted coffee products.
Identifying coffee species after the roasting process presents a significant scientific challenge. Roasting alters the physical characteristics of the beans and degrades many of the standard organic compounds used for botanical identification. Traditional physical inspection and wet chemistry methods are insufficient for detecting low-level Robusta blending in ground or roasted coffee. To overcome this, a highly sensitive, fingerprinting analytical technique is required to identify specific, heat-stable chemical markers that differentiate Arabica from Robusta.
Our technical experts recommended nuclear magnetic resonance (NMR) Spectroscopy for high-resolution species authentication. NMR fingerprinting was used to evaluate the characteristic chemical profile of each sample and quantify species-specific marker compounds associated with Arabica and Robusta coffee. In addition, NMR specifically targets 16-O-Methyl Cafestol (16-OMC), a diterpene that is naturally present in Robusta coffee beans but virtually absent in Arabica. The presence of 16-OMC serves as a definitive biomarker for Robusta adulteration. Additionally, we quantified key diterpenes—Cafestol and Kahweol—alongside physical parameters such as density and viscosity to build a robust diagnostic profile of the client's submissions.
Two roasted coffee samples were submitted were submitted for solid-state preparation and subsequent NMR analysis. The key findings are summarized below:
| Parameter | Sample 1 | Sample 2 |
| Arabica Content | Confirmed as predominant (>99%) | Confirmed as predominant (>99%) |
| Robusta Content | Below reporting threshold | Below reporting threshold |
| Cafestol | Within expected range for authentic Arabica | Within expected range for authentic Arabica |
| Kahweol | Consistent with Arabica profile | Consistent with Arabica profile |
| 16-O-Methyl Cafestol | Not detected | Not detected |
| Density | Comparable between samples | Comparable between samples |
| Viscosity | Within normal range | Within normal range |
The analytical results confirmed that both samples exhibited a profile characteristic of predominantly Arabica coffee, with Robusta content remaining below the laboratory reporting threshold. For both samples, the concentration of 16-OMC fell below our laboratory's limit of quantification. This confirms the absence of Robusta adulteration. Moreover, both samples displayed significant concentrations of Kahweol and Cafestol. The prominent Kahweol levels are highly characteristic of pure Coffea arabica, confirming that both batches conform to a 100% Arabica profile.
Independent laboratory verification enabled the client to substantiate the authenticity of its roasted coffee products using scientifically validated analytical evidence. The test results strengthened confidence in product labeling, supported internal quality control procedures, and provided credible documentation for commercial communications and supply chain verification. By confirming the consistency of the submitted samples, the client was able to reinforce product integrity while reducing the risk of authenticity disputes in increasingly quality-focused global coffee markets.
Whether you need to verify coffee species composition, investigate potential adulteration, or support premium product claims, our accredited laboratories provide scientifically robust analytical solutions using advanced technology.
👉 Contact our experts to discuss a customized coffee authenticity testing program tailored to your products and quality objectives.
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