Sorghum Malt Evaluation Methods: A Field Survey
No lab ever sat down to design an evaluation method for sorghum malt as a character ingredient in an external-enzyme process. Instead, the field assembled a patchwork: South Africa's opaque-beer standard, the foundational CSIR assays it codified, barley institute methods applied off-label, academic lab conventions, and commercial certificate-of-analysis practice. Each has real strengths inside its original context. None was built for ours — which is why, in our own correspondence over the years, the informal fallback kept turning out to be ask Bard's.
The methodologies
| Methodology | Built for | The short verdict |
|---|---|---|
| SABS / SANS 235 | South Africa's opaque-beer industry | Correct at home; the field's stopgap everywhere else |
| Novellie / CSIR assays | Putting kaffircorn malting on a lab footing (1950s–60s) | The foundation everything else stands on — enzyme-first by premise |
| Barley-adapted methods | Barley malt, applied to sorghum with adjustments | Comparable numbers, wrong premise — the congress mash measures sorghum's deficit |
| IoB and EBC methods | European institute barley analysis | Same lineage, plus a unit-fragmentation problem the literature documents |
| Taylor / Pretoria conventions | Academic sorghum research | The research workhorse — rigorous, and enzyme-oriented by research question |
| Commercial COA practice | Whatever panel the lab already runs | Available and honest, but measures barley premises or feed nutrition |
What the patchwork tells you
Three patterns run through every page above. First, every method descends from an enzyme-first question — how much conversion power does this malt carry? — because every originating context (opaque beer, barley brewing, cereal-chemistry research) needed exactly that. Second, units fragmented because methods were borrowed rather than shared: SDU, °Lintner, °WK, and ASBC numbers coexist without clean conversion. Third, nobody measured the drinkability set — wort clarity, flavor contribution, FAN as a nutrition planning number — as first-class outputs, even though those decide whether a modern sorghum beer succeeds.
That three-part gap is what the proposed Sorghum Malt Evaluation Standard (GFB-SME) exists to fill.
What these pages do not list: instruments
Each method above is characterised from the published literature around it, not from the standard's own text, because national standards are copyrighted documents and this site describes rather than reproduces. The literature reports units and results, and almost never apparatus: a diastatic-power figure arrives in SDU, °Lintner, °WK or ASBC units without saying what produced it, and a turbidity figure arrives as a number without its meter. So the per-method instrument list a lab would want is a gap in the record, and we have not filled it by inference. The proposed standard closes it the only way a reader can check, by requiring every reported value to carry its unit and instrument type, declared, with turbidity calibrated against a formazin standard. If you hold a method's current text and can name its instruments, that is a contribution these pages need; the research asks say how to send it.
For the decision view — every method side by side with pros, cons, and our proposal under the same scrutiny — see Methods Compared.
Related
- Proposed: Sorghum Malt Evaluation Standard
- Data Catalog — the datasets these methods produced