How to compare Whey Protein Concentrate 34 specifications

Start by aligning the protein basis

A protein result is comparable only when you know what the percentage is measured against. An as-sold value describes the powder as received, including its moisture. A dry-basis value excludes moisture and expresses protein relative to the dry matter. Since moisture contributes weight but not protein, the same material can show a higher protein percentage on a dry basis than as sold.

To convert a dry-basis result to an as-sold estimate, multiply it by the dry-matter fraction: 1 minus the moisture fraction. For example, if moisture is recorded as a percentage, use (100 minus moisture percentage) divided by 100. This calculation is useful for comparison, but it does not replace the supplier’s reported result or account for differences in analytical methods.

Before comparing offers, check whether each protein value is reported as sold or on a dry basis, how moisture was measured, and how protein was calculated. If the analysis does not state its basis or method, the percentages may not be directly comparable—even when both products are called Whey Protein Concentrate 34.

Read the full analysis, not the protein line alone

Moisture helps explain the difference between an as-sold protein result and a dry-basis result. It also matters when evaluating the powder’s condition and planning storage. Compare moisture values only when their reporting basis and test method are clear.

Fat and ash add context to the composition. Fat can affect how a formulation balances its dairy ingredients, while ash represents mineral content and may matter when matching a target composition. Lactose is another useful comparison point: it describes a carbohydrate portion of the powder and can affect how a WPC fits into a formula with other dairy solids. These results help distinguish offers beyond their headline protein figure.

pH is a measure of acidity and may be relevant when a formulation or process has a defined pH requirement. It is most useful when the specification states the method or sample conditions, so the result can be interpreted consistently. No single value for these measures should be assumed to define every WPC 34 offer.

Check test conventions and sample context

Two analyses can differ because of the material itself, but also because laboratories use different procedures, reporting bases or sample preparation. Protein methods can differ in how they measure nitrogen and calculate protein. Moisture methods can also affect comparisons. When a result is important to your purchase, compare the named method and units as well as the number.

Microbiological criteria should match the intended food application and the buyer’s own quality requirements. The relevant organisms, sampling plan, method and acceptance limits need to be stated rather than inferred from the product name. A specification can set requirements for routine supply, while a lot analysis reports results for a particular lot; review both when consistency and lot acceptance matter.

Treat a supplier specification and a lot analysis as related but distinct documents. The specification describes the requirements for the offered product. The lot analysis provides results for a defined lot. Check that the product identity, lot reference, units, methods and limits are clear, and resolve any unexplained difference before using the result for acceptance.

Build a like-for-like comparison

Put the offers into a comparison table with the reported protein value, protein basis, moisture, fat, ash, lactose, pH and any microbiological criteria relevant to your use. Add a column for the method or reporting convention and another for whether each result is a product limit or a lot result. Mark missing information as missing instead of treating it as equivalent.

Do not use a range from a particular purchasing program or specification as a universal definition of WPC 34. Requirements can depend on the product offer, intended use and buyer’s acceptance criteria. Define the values and methods your process actually needs, then assess each offer against that shared target.

Once the required analysis and reporting basis are clear, use the Whey Protein Concentrate 34 sourcing page to discuss matching the specification to a bulk requirement. Include the intended application and the analysis details that are essential to your comparison.

Common questions.