Extrusion (kibble and dry treats):

• Binders facilitate mixing and cohesion of proteins, carbohydrates and fresh meats in the preconditioner before extrusion.
• Carbohydrate-based binders can increase expansion or produce softer textures; protein-based binders support structural integrity of air cells during expansion but may limit expansion.
• The balance of amylose and amylopectin content is critical: high-amylose starches produce firmer textures but require higher water injection, elevated barrel temperatures and increased shear; amylopectin has higher water-holding capacity, is more susceptible to gelatinisation and requires lower shear and cook temperatures.

Wet pet food (shelf-stable / retort):

• Modified, highly cross-linked starches are the primary choice for retort products — they build pre-retort viscosity for effective heat transfer, suspend particulates and resist breakdown throughout shelf life under wide temperature ranges.
• Gravies and chunk-style formats require distinct binder strategies: gravies need viscosity-building agents; chunks need gelling agents to maintain structure and firmness.

Refrigerated pet food:

• Water binding is the priority function, making bound water unavailable for microbial growth and slowing spoilage.
• Cold tolerance is essential to maintain product integrity throughout the refrigeration chain.

Frozen pet food:

• Binders mitigate texture, colour and palatability losses caused by repeated freeze-thaw cycles by tightly binding water and reducing water activity.

Alginate-calcium microencapsulation system (Balchem):

• Combines sodium alginate with microencapsulated calcium lactate to form a calcium-alginate gel that is thermo-irreversible and stable across a wide pH and temperature range.
• Microencapsulation controls the gelation rate, introducing a delay between mixing and product set to prevent premature gelling under shear — enabling both ingredients to be added in a single mixing step with no specialised equipment (no calcium bath or spray step required).
• Specifically designed for high-meat and co-product-rich formulations.

Starch-based binders

• Native dent corn starch: Widely used in extruded kibble; cost-effective.
• High-amylose starch (50% or 70% amylose): Used for firmer kibble textures; demands higher process intensity.
• Modified cross-linked starches: Preferred in retort/shelf-stable wet food for heat stability and viscosity maintenance.
• Ancient grains: Amaranth, quinoa, millet, rice and tapioca used in kibble and dry treats.

Protein-based binders

• Egg (whole egg / egg white / dried whole egg):
  • Egg white albumin coagulates on heating, binding kibble particles and improving structural integrity.
  • Egg yolk lecithin emulsifies fats and water, improving texture and palatability.
  • Egg white products (high albumin) offer maximum binding in grain-free or high-meat kibble, with observed benefits in yield, appearance, texture and shelf life.
  • High nutritional value: highly digestible, bioavailable protein.
• Wheat gluten, corn gluten meal, gelatin: Structural binders for extruded formats.
• Soy protein, pea protein: Provide binding and structural integrity in extruded kibble while supplying digestible protein.

Hydrocolloid / gum binders

• Carrageenan, cassia gum, guar gum, xanthan gum: Used in shelf-stable wet pet food for gel strength and moisture control.
• Sodium alginate + microencapsulated calcium lactate (Balchem): Thermo-irreversible calcium-alginate gel system for high-meat formats; no special equipment required.
• Lecithin: Natural emulsifier used in wet pet food for ingredient compatibility.

• Egg white in high-meat kibble: Reported improvements in yield, product appearance, texture and shelf life versus standard binder approaches.
• Calcium-alginate system: Calcium-alginate gel is thermo-irreversible and stable across a wide pH and temperature range; microencapsulation prevents premature gelation under shear during mixing.
• Modified cross-linked starches in retort: Maintain viscosity and structure through the full retort process and commercial shelf life without gelling excessively or breaking down.
• High-amylose vs amylopectin: Formulators must calibrate amylose/amylopectin ratios alongside water injection levels, barrel temperatures and shear intensity to achieve target shape, size and density in extruded kibble.

• Premiumisation and humanisation: Pet parents increasingly seek products resembling human food, favouring natural, label-friendly and “kitchen-friendly” ingredients such as egg. This category pressure limits ingredient options, particularly in the refrigerated segment.
• Clean label and plant-based trends: High-value human food ingredient technologies — including plant proteins and naturally derived starches — are being adapted for pet food to support clean-label positioning.
• Sustainability and alternative proteins: Pet food manufacturers are incorporating upcycled protein side streams and alternative proteins not destined for human consumption. These co-products present processing challenges and require tailored binder approaches.
• Innovation outlook: Industry experts highlight the importance of leveraging processing aids in novel ways and exploring new ingredients to address evolving product development challenges while ensuring regulatory compliance and safety.