Indian Spices · Dry Red Chilli
Understanding Chilli SHU (Scoville Heat Units)
Scoville Heat Units are the most common way buyers express required pungency, but the number alone doesn't tell the whole story. This guide explains what SHU is and how to use it in a specification.
What SHU measures
Scoville Heat Units measure the pungency (perceived heat) of chilli, based on the concentration of capsaicinoids — the compounds responsible for the heat sensation. Higher SHU means higher perceived pungency.
How it's measured today
The original Scoville test relied on human taste-panel dilution and has largely been replaced by HPLC (High-Performance Liquid Chromatography) laboratory analysis, which measures capsaicinoid concentration directly and converts it to an SHU-equivalent figure. HPLC results are generally considered more consistent and reproducible than the original organoleptic method.
Specifying a pungency range
Because pungency varies naturally by variety, growing conditions and even within a single harvest, buyers typically specify a SHU range (e.g., a minimum and maximum) rather than a single fixed number, and agree which lab/method will be used to verify it (see the Chilli Quality Protocol).
It's worth confirming whether the buyer's SHU requirement is for the whole/ground chilli as supplied, or for a specific downstream product (like an oleoresin extract), as these are measured differently.
Key Takeaways
- SHU measures capsaicinoid-driven pungency; higher SHU means more perceived heat.
- Modern testing uses HPLC analysis rather than the original taste-panel method, for consistency.
- Specify a SHU range, not a single fixed number, and agree the testing lab/method in advance.
FAQ
Can two chillies with the same variety name have different SHU?
Yes — pungency varies by growing region, season, and even lot to lot within the same variety. Always confirm actual test results for the specific lot rather than relying on the variety name alone.
Related Glossary Terms
Related Protocols
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