Which parameters can be customised (DH, MW, debittering, particle size)?

Beyond Biopharma | Plant Protein Peptide FAQ

Short answer: Degree of hydrolysis, molecular weight distribution, debittering, particle size and granulation, blend ratio and packaging format are the plant peptide parameters most often adjusted to fit a specific application, each within the limits set by the chosen raw material and the hydrolysis process.

Why customisation exists at all

One plant peptide grade cannot serve a clear protein water, a high-protein bar, a clinical oral nutritional supplement and a gummy at the same time. A drink wants solubility and clarity with as little bitterness as possible; a bar wants a powder that does not harden the matrix over shelf life; clinical nutrition wants a defined molecular weight profile and a documented digestibility story; a gummy wants low viscosity at high solids. Because hydrolysis is a controllable reaction, the supplier can steer the product towards one of those targets rather than offering a single standard grade for everything.

Degree of hydrolysis (DH)

DH describes the percentage of peptide bonds that have been cleaved, so it is the master variable behind most other properties. A lower DH keeps longer chains: better body and mouthfeel, lower osmolarity, usually less bitterness, but slower dissolution and a greater tendency to haze. A higher DH gives shorter chains: faster dissolution, clearer solutions and a lighter mouthfeel, but more bitterness and a higher osmolarity that matters in clinical and sports drinks. DH is normally defined with a test method and an acceptable band.

Molecular weight distribution

Molecular weight distribution is the property most customers actually feel in the finished product, and it is often specified in bands, for example the percentage of the material below a certain kilodalton cut-off. Two lots can share a similar DH and still differ in distribution, which is why a distribution curve or band specification is more useful than a single average value. Enzyme choice, hydrolysis time and any membrane fractionation step after hydrolysis are the levers used to move the curve, and narrowing a distribution usually means extra processing and yield loss.

Debittering and taste profile

Bitterness in plant peptides comes mainly from short hydrophobic peptides released during hydrolysis. Common approaches are to select enzymes that leave fewer of those peptides, to stop the reaction at a defined point rather than running it further, to use an adsorption or resin treatment, to apply membrane fractionation that removes part of the bitter fraction, or to mask the note in the finished formula with sweeteners, acids, flavours and salts. Debittering usually costs yield and money, so the practical target is a defined bitterness level that the application can tolerate rather than a completely neutral taste.

Particle size, granulation and flow

• Powder fineness - a fine powder dissolves faster in liquid but generates dust and can be harder to handle in dry blending.
• Granulation or agglomeration - coarser, free-flowing particles reduce dust, improve wettability and dispersibility, and are easier to fill into sachets or sticks.
• Bulk density - matched to the filling equipment and to the target scoop or sachet weight.
• Flowability and caking - adjusted with granulation and packaging rather than by adding free-flow agents where a clean label is required.

Blends, carriers and packaging

Beyond the peptide itself, a supplier can usually prepare a blend: a pea plus rice combination for a broader amino acid profile, a peptide with a carrier or bulking agent for a stick pack, or a pre-blended system with minerals, vitamins or flavour for a ready-to-mix powder. Packaging format belongs to the same conversation, because a 20 kg multiwall bag, a lined fibre drum and a smaller foil pack differ in moisture protection.

What cannot be customised

Customisation is not unlimited. A pea peptide cannot be made to taste like whey, a low-allergen source cannot be made to carry a soy or wheat allergen profile, and protein content above a certain point is limited by the raw material and the purification route. Every change also costs yield, time and the minimum production quantity.

Related reading

For more detail, see how batch-to-batch consistency is controlled, how to choose a grade for an application and multi-source blends such as pea plus rice.