Caffeine pouch pH testing
Specify how the sample is prepared: whole pouch or extracted fill, liquid-to-sample ratio, water quality, contact time and temperature. A pH result from one method should not be compared to another as if the conditions were identical.
Moisture is not water activity
Moisture content measures water quantity under the chosen method. Caffeine pouch water activity concerns available water under the measurement conditions. Both can matter, but one cannot be substituted for the other without a justified relationship.
Connect measurements to observations
| Observation | Possible checks to plan |
|---|---|
| Caking or poor flow | Moisture uptake, raw-material properties and pack barrier |
| Sensory drift | Formula version, pH method, moisture and storage |
| Seal problems | Bag material, process settings, fill contamination and integrity |
| Storage change | Defined conditions, intervals and relevant product endpoints |
Avoid a universal target
The appropriate limits depend on the actual formulation, contact materials, microbial considerations and intended market. This guide does not prescribe a single pH or water activity for all pouches. Define the basis and review it with the responsible technical team.
Project questions
What should I send for this review?
Send the target market, formula and pack version, the question you need answered and existing documents. Identify which values are proposed and which have already been approved.
Does this guide define an approved product specification?
No. Use the guide to prepare a project-specific review. Methods, acceptance criteria and responsibilities are agreed for the actual formulation, pack and market.