Cost & Quoting

Costing and Quoting Industrial Enzymes: What Drives Cost Per Unit

A full batch cost stack for industrial enzymes and the three errors that put quotes 20 percent underwater.

In industrial enzymes the unit of sale is kg of formulated product or billions of activity units, and cost per unit is total batch cost divided by units that survive to the drum, not units in the fermenter. Because downstream losses run 20 to 30 percent, costing on fermenter output understates true cost by that same margin. A defensible number starts with a full batch cost stack: raw media, fermentation capacity time, downstream consumables, drying energy, labor, QA hold, and an allowance for batch failure. Miss any one line and your quote leaks margin you will not see until year-end reconciliation.

Raw material is usually the largest variable cost, 30 to 50 percent of cash cost for a bulk enzyme. Carbon source dominates: glucose syrup at 350 to 500 dollars per dry tonne, plus organic nitrogen such as soy peptone or corn steep, and mineral salts. A 100,000 L batch consuming 68 tonnes of glucose equivalent at 420 dollars is 28,560 dollars, plus roughly 8,000 dollars of nitrogen and 3,000 dollars of salts and antifoam. The Media Cost calculator itemizes cost per liter of broth by component. Watch sensitivity: a 15 percent glucose price swing moves cost per unit 5 to 8 percent.

Fermenters are the capacity bottleneck, so charge cost per occupied hour, not per liter, when the plant is capacity bound. A 100,000 L train with 8 million dollars installed cost over a 15 year life, running 300 batches per year on a 132 h cycle of 120 h ferment plus 12 h turnaround, carries roughly 1,780 dollars per occupied hour of fixed plus utility cost, about 235,000 dollars per batch. Shaving the cycle from 132 to 120 h adds around 27 batches of annual capacity. That freed time is worth real revenue, which is why turnaround shows up in costing.

Direct labor on a highly automated line is modest, perhaps 4 to 6 operators per shift at a loaded 55 dollars per hour, but QA release is a hidden cost and a schedule risk. Full micro and activity release can hold product 7 to 14 days, tying up working capital and drum storage. The QA Release Time calculator translates that hold into carrying cost. Do not bury it in overhead. A batch that sits 10 extra days at a 12 percent cost of capital on 400,000 dollars of inventory costs about 1,300 dollars, and repeated across 300 batches that is real money.

Bio processes fail, so every good batch must absorb the cost of the failures. At a 3 to 6 percent batch loss rate from contamination or off-spec titer, the math bites. If a lost batch destroys 235,000 dollars of media, time, and labor, and you fail 4 percent of 300 batches, that is 12 batches and 2.8 million dollars per year spread across 288 good batches, roughly 9,800 dollars added per shipped batch. The Batch Failure Cost calculator models this allowance directly. Leaving it out is the classic reason a quote looks competitive and then loses money at scale.

Downstream consumables such as filter media, UF membranes, and diafiltration buffer run 15 to 25 dollars per kg of protein. Drying is energy heavy but smaller: removing 790 kg of water per 1,000 kg of concentrate at 3.2 MJ/kg and 0.04 dollars per kWh thermal adds about 28 dollars per batch of that stream. Use the Drying Energy calculator for evaporation load and the Filtration Capacity calculator to avoid oversizing membranes, which is buried capital sitting idle. Plant overhead and depreciation typically add another 20 to 35 percent on top of cash cost before margin.

Build the quote by stacking cost per shipped unit: media plus capacity time plus downstream plus drying plus labor plus QA hold plus failure allowance equals cash cost, then apply overhead and target margin. Commodity enzymes carry gross margins of 30 to 45 percent; specialty or regulated grades reach 55 to 70 percent. Quote on units guaranteed at label claim after Potency Overfill, because the overfill, often 8 to 12 percent, is product you ship free. Pricing on label units while shipping overfilled product silently hands away 8 to 12 percent of margin every order.

Three recurring errors sink enzyme quotes: costing on fermenter units instead of recovered units, forgetting the overfill giveaway, and omitting the failure allowance. Each understates cost 5 to 12 percent, and stacked they can put a quote 20 percent underwater while looking sharp on paper. Validate every estimate against a plant mass and activity-unit balance quarterly, and reprice whenever glucose or energy moves more than 10 percent. A quote that reconciles to actual cost per shipped billion units within 5 percent is defensible. Anything looser than that is guessing with a spreadsheet.

Published 2026-07-02.