Protein Digestibility Corrected Amino Acid Score (PDCAAS) Testing

Q: When is PDCAAS testing legally required for the U.S. market?

Under FDA regulations (21 CFR 101.9), PDCAAS is mandatory for any protein-related nutrient content claim. Additionally, it is required for any product intended for infants or children under the age of 4, regardless of whether a claim appears on the label.

Q: What is the typical turnaround time for a PDCAAS analysis?

The analytical process for a complete PDCAAS profile generally requires 10 to 15 business days. This timeframe ensures the accuracy of the laboratory's chemical hydrolysis and the subsequent high-resolution chromatography needed to quantify the full amino acid profile.

Expert Chemical Analysis for FDA and Health Canada Regulatory Compliance

Mérieux NutriSciences provides high-precision protein analysis to help you navigate the rigorous labeling requirements of the North American market. As a core component of our Chemistry Testing services, our comprehensive testing protocols determine the Protein Digestibility Corrected Amino Acid Score (PDCAAS), ensuring defensible data and industry-leading science support your nutritional claims.

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What is the Protein Digestibility Corrected Amino Acid Score?

The PDCAAS method is the gold standard for evaluating protein quality, factoring in both the specific amino acid requirements of humans and the biological availability of those nutrients. Essential to accurate Nutritional Testing, this method goes beyond standard proximate analysis, which only measures total nitrogen content, to quantify how effectively the human body can metabolize and utilize the protein within a specific food matrix. To reach the final Protein Digestibility Corrected Amino Acid Score, the amino acid score is multiplied by the true digestibility percentage.

Amino Acid Profiling

We use high-resolution chromatography to identify and quantify the concentrations of specific essential amino acids in the sample.

Reference Scoring

These concentrations are compared against the FAO/WHO reference pattern for essential amino acids. If the sample is deficient in one or more "limiting" amino acids, the score is adjusted to reflect the true nutritional value.

True Protein Digestibility

Using validated digestibility factors, we determine the actual percentage of protein absorbed by the body.

Regulatory Applications in North America

While the methodology remains consistent, the resulting data is applied differently to meet specific regional labeling regulations.

Canada: Health Canada Requirements

In the Canadian market, the Protein Digestibility Corrected Amino Acid Score is the foundational value used to determine the official Protein Rating. This rating is calculated by multiplying the PDCAAS by the protein amount found in a Reasonable Daily Intake (RDI).

Good Source Claim: Requires a Protein Rating of 20 or higher.
Excellent Source Claim: Requires a Protein Rating of 40 or higher.

United States: FDA Requirements

For products distributed in the U.S., the FDA mandates the use of PDCAAS to calculate the Percent Daily Value (%DV) for protein displayed on the Nutrition Facts panel. This calculation is a regulatory requirement for any product making a protein claim or those intended for infants and children under four years of age.

Analysis Across Complex Food Matrices

Biological samples behave differently during extraction and hydrolysis. Our laboratory has developed validated protocols to ensure precision across a wide range of product categories, including:

Dairy

Dairy sector matrices require tailored extraction for protein accuracy.

Plant-based and Novel Foods

Plant sector matrices require tailored extraction for protein accuracy.

Meat and Poultry

Meats sector matrices require tailored extraction for protein accuracy.

R&D Support and Formulation Optimization

If your initial results fall below your required targets, our technical team provides the insights needed to reformulate. By identifying the specific "limiting amino acid" through detailed profiling, we help your R&D team:

Optimize Protein Blending

Combine protein sources to close nutritional gaps and provide a complete amino acid profile.

Improve the Final Score

Strategically adjust formulations to move from a "Source of Protein" to an "Excellent Source" claim.

Ensure Cost-Efficiency

Refine your recipe to meet regulatory thresholds without over-engineering the ingredient list.

Additional Chemistry Related Resources

How does PDCAAS differ from the newer DIAAS method?

While the Digestible Indispensable Amino Acid Score (DIAAS) is recognized for its precision in measuring ileal digestibility, PDCAAS remains the current regulatory standard for food labeling in both the United States and Canada. Our laboratory continues to monitor international shifts in these methodologies to ensure our clients remain ahead of regulatory changes.

What do we need to get started with PDCAAS testing?

To begin PDCAAS testing, we require 100–200 g of the finished product, a complete percentage breakdown of all ingredients to accurately identify protein contributors, and confirmation of whether the product is intended for the general population (4+ years) or infants/toddlers, as the reference amino acid scoring pattern varies by target demographic.

What is a "limiting amino acid" and why is it significant?

The limiting amino acid is the specific essential amino acid found in the lowest concentration relative to the FAO/WHO reference pattern. Because the human body requires these building blocks in specific ratios, the final score is determined by this lowest value. Identifying the limiting amino acid is a critical step for R&D teams looking to optimize protein blends.

When is PDCAAS testing legally required for the U.S. market?

What is the typical turnaround time for a PDCAAS analysis?