NIR in the Maltings: Grade Barley at Intake, Verify Malt Extract Before Shipment
How maltsters use NIR to grade barley protein at intake and verify malt extract potential — the two key decisions that define batch quality.
Where NIR Fits in Malting and Brewing
Barley Protein and Malt Extract
NIR Across the Chain
Frequently Asked Questions
- Why does barley protein matter to maltsters?
- Barley protein affects extract efficiency and fermentability in the brewery. High-protein barley (13–15%) yields more malt but produces beer with hazy suspension and reduced shelf stability. Low-protein barley (9–11%) is preferred — it gives high extract yield and clear, stable beer. Maltsters grade incoming barley by protein and price accordingly. NIR at intake gives immediate classification, allowing rapid sorting and fair pricing.
- What is malt extract potential and how does NIR predict it?
- Malt extract potential is the maximum fermentable sugar the malt can yield during brewing — expressed as a percentage of the malt's dry matter. It's determined by enzyme content and starch availability. Higher extract means fewer bushels of malt needed per barrel of beer. The brewing industry measures extract by a labor-intensive lab method; maltsters predict it from malt composition (protein, moisture, color) measured at malting completion. NIR on finished malt predicts extract because the spectral features correlate with enzyme development.
- Do breweries use NIR on raw materials or only maltsters?
- Maltsters use NIR most heavily — grading barley at intake and verifying malt quality at release. Large breweries may also run NIR on malt shipments to verify supplier quality before use. Small craft breweries less commonly have on-site NIR because malt variability is part of their flavor exploration. Contract maltsters and large malt suppliers depend on NIR for throughput and consistency.