Every kilogram of moringa seed oil or seed-based ingredient starts with an unglamorous but critical step: removing the hard hull from the seed. By hand, dehulling is slow, labour-intensive and inconsistent — a real bottleneck at commercial scale. This engineering study in Wiley’s Journal of Food Process Engineering, by researchers at the University of Uyo, Nigeria, set out to characterise moringa seeds and optimise a mechanical dehulling process.
What the study did
The team measured the physical size characteristics of moringa seeds, then tested how four machine variables — moisture content, feed rate, drum speed, and beater–drum clearance — affected dehulling efficiency across small, medium and large seed sizes, using response-surface optimisation.
Key findings
- Optimised dehulling efficiency reached 84% (small), 89% (medium) and 99.7% (large) seeds.
- Best results came at roughly 9.4% moisture, 1.35 kg/min feed rate, ~845 rpm drum speed and 6.4 mm beater–drum clearance.
- Seed size significantly affects dehulling — grading seeds by size before processing improves throughput and cuts waste.
The practical message: with the right moisture conditioning, machine settings and size-grading, mechanical dehulling becomes fast, consistent and highly efficient, replacing tedious manual work.
Caveat: optimal settings are specific to the dehuller design and seed stock tested; other equipment and varieties need their own calibration.
Summary of: Fakayode, O.A., Akpan, D.E. & Ojoawo, O.O. (2019). Journal of Food Process Engineering, 42(6), e13182. DOI: 10.1111/jfpe.13182. Full paper from the publisher via the link above.