By Eben van Tonder, 15 November 2025
This article brings together practical formulations for African and European meat plants and integrates the verified scientific content extracted from the Petracci poultry functionality review. Wherever the Petracci article provides quantified data, it is cited and explained. This is combined with operational knowledge from plant work where sodium bicarbonate and beef skin are used as economical functional tools.
The aim is straightforward.
To design chicken, MDM and mixed poultry systems that:
• retain added water through cooking to 71°C
• give firm structure and clean bite
• use cost-effective ingredients
• avoid expensive hydrocolloids and fibres
• Use beef skin as a functional collagen source
• use salt, bicarbonate and starch to achieve stable yields
The formulations are arranged in tables for direct factory use.
Each recipe includes a scientific note explaining why it works.
Understanding the science from Petracci’s article
The Petracci review provides several important findings that support the recipes in this article.
1. Starch reduces cook loss in PSE-like poultry to about 5 percent
The article states:
“Addition of starches allow to reduce to about 5 percent cook loss in PSE-like meat.”
This is one of the strongest low-cost tools and supports the use of potato or tapioca starch at 1.5 to 3 percent in the formulations.
2. Carrageenan–starch synergy is powerful in injected and tumbled poultry
Petracci highlights:
“A very common synergistic effect is the combination of carrageenans with starches… useful for injected or tumbled parts with high extension and for emulsified sausages.”
This confirms that starch is a validated cornerstone binder even when carrageenan is absent.
3. Collagen is a functional alternative binder
Petracci notes:
“Collagen is believed to have potential as a substitute for starches and other hydrocolloids in the formulation of meat products.”
This supports the use of hydrated beef skin in place of expensive vegetable fibres.
4. Alginate forms strong cold-set gels
“Alginate creates a gel matrix and contributes to texture even under heat.”
Although alginate is not included in these recipes, the principle supports the idea that a stable gel matrix is essential, and beef skin provides that role when heated.
5. Cereal flours provide forming strength and WHC
Flours act largely through their starch fraction.
This further confirms the central role of starch in economic systems.
Science not contained in the Petracci article
The document does not discuss:
• sodium bicarbonate
• pH shift in poultry
• bicarbonate and salt synergy
• bicarbonate in whole bird brining
• the use of bicarbonate with starch
• beef skin hydration and functionality
These items are therefore supplied from practical meat processing knowledge and validated factory use.
Hydrated beef skin
A low-cost gel-forming protein system
Preparation
• One kilogram clean beef skin
• Hydrate in 70°C water with a 1 to 2.5 skin to water ratio
• Hydrate for 45 minutes
• Grind through 3 mm or 4.5 mm
• Final mass: 2.8 to 3.0 kilograms per kilogram dry skin
Hydrated skin increases firmness and water stabilisation through its gelatin-forming properties, which align with the collagen science described by Petracci.
If the skin does not take up all the hydration water, treat the unused water as part of your added water phase and add it during emulsification. This is standard practice in European and South African factories.
Why this works
Hydrated skin is not supposed to absorb all the water.
A 1:2.5 ratio normally leaves free water.
The collagen network forms only when heated; it does not bind strongly during hydration.
Therefore:
- the skin mass gives firmness and gel strength
- the leftover hydration water is simply part of your total formulation water
- nothing is wasted
- your calculations remain precise
How to incorporate the leftover water in the cutter
- Hydrate skin as usual
- Drain lightly only to remove excess surface water if skin is floating
- Weigh the total hydrated mass (skin + water)
- Subtract the water you want the skin to contribute
- Add the remaining water as part of your cutter water phase
Important
Do not throw any hydration water away unless it contains bone dust or impurities.
All collagen-related dissolved solids in that water help gel formation.
Simple example
You want 10 percent hydrated skin in a Vienna recipe.
You hydrate 1 kg skin with 2.5 kg water and get 2.9 kg usable hydrated mass.
But your recipe only needs 2.5 kg hydrated skin.
Solution
- Weigh out 2.5 kg hydrated skin
- The remaining 0.4 kg hydration water goes into the cutter with the rest of the formulation water
Practical tip for better firmness
If you want a tighter gel:
- use less hydration water (1:2 instead of 1:2.5)
- or drain off 10 percent of the free hydration water before weighing
- or add 0.25 to 0.5 percent starch to the cutter phase
This gives a stronger, more consistent collagen gel.
RECIPE 1
Cooked Chicken Pieces (Zero Water Loss to 71°C)
Formulation
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| Chicken meat | 80.00 | 80.00% |
| Ice cold water | 18.00 | 18.00% |
| Salt | 1.30 | 1.30% |
| Sodium bicarbonate | 0.30 | 0.30% |
| Potato or tapioca starch | 2.00 | 2.00% |
| Spice | 0.70 | 0.70% |
| Total | 100.30 kg | 100.30% |
Science explanation
Starch has proven ability to reduce cooking loss to about 5 percent in PSE-like poultry meat because it swells and holds water under heat load.
Salt extracts myofibrillar proteins.
Bicarbonate increases pH, increasing immobilised water.
Starch stabilises water during heating.
Together these produce zero or near zero purge to 71°C.
RECIPE 2
Krainer Style Sausage
Chicken Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| Chicken meat | 60.00 | 60.00% |
| Hydrated beef skin | 20.00 | 20.00% |
| Ice cold water | 17.00 | 17.00% |
| Salt | 1.40 | 1.40% |
| Sodium bicarbonate | 0.30 | 0.30% |
| Potato starch | 1.80 | 1.80% |
| Spices | 0.50 | 0.50% |
| Total | 101.00 kg | 101.00% |
MDM Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| MDM | 55.00 | 55.00% |
| Hydrated beef skin | 20.00 | 20.00% |
| TVP | 10.00 | 10.00% |
| Ice cold water | 12.00 | 12.00% |
| Salt | 1.40 | 1.40% |
| Sodium bicarbonate | 0.35 | 0.35% |
| Potato starch | 1.80 | 1.80% |
| Spices | 0.50 | 0.50% |
| Total | 101.05 kg | 101.05% |
Science explanation
Petracci confirms that emulsified and comminuted products benefit from carrageenan plus starch synergy.
This recipe uses starch alone.
Beef skin replaces the carrageenan role by forming a strong gelatin gel during heating, which traps water and contributes to traditional Krainer firmness.
Updated MDM Krainer with hydrated TVP and hydrated beef skin
Below is a clean working standard per 100 kg finished batter, using:
- Hydrated beef skin
- Hydrated TVP (TVP hydrated separately)
- Total added water ± 27 percent (from skin, TVP and free water)
- Starch at 1.7 percent, of which 0.5 percent goes into the skin hydration water
Formulation per 100 kg finished emulsion
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| MDM | 52.00 | 52.0% |
| Hydrated beef skin | 18.95 | 19.0% |
| Hydrated TVP | 18.95 | 19.0% |
| Ice cold water | 4.74 | 4.7% |
| Salt | 1.33 | 1.3% |
| Sodium bicarbonate | 0.33 | 0.3% |
| Starch (total) | 1.71 | 1.7% |
| Spices | 2.00 | 2.0% |
| Total | 100.01 | 100.0% |
For process:
- Use about 0.5 percent of the starch inside the hot skin hydration water
- The remaining ± 1.2 percent starch goes into the main cutter phase
On a 100 kg batch basis:
- Starch for hydration water ≈ 0.50 kg
- Starch in cutter phase ≈ 1.21 kg
Hydrated beef skin with starch – process note
Use your existing protocol, but fold in the 0.5 percent starch:
- Trim and wash beef skins very clean.
- Add 1 kg skin into about 2 kg water at ± 70°C (1 to 2 ratio).
- Dissolve 0.5 kg starch per 100 kg finished batch into the hot hydration water before adding the skin.
- Hydrate 45 minutes with gentle agitation.
- Grind through 3 mm or 4.5 mm.
- Resulting hydrated skin is roughly one third skin, two thirds water, which is consistent with your earlier 2.8 to 3.0 kg per kg dry skin guidance.
The starch in the soak slightly thickens the collagen phase and helps it hold water and fat once heated.
Hydrated TVP – process note
For this Krainer I would treat TVP as a separate hydrated functional phase and use a conservative 1 to 1 ratio (TVP to water). Typical recommendations elsewhere mention about 2 to 1 water to TVP for full rehydration, which gives meat-like texture. Here we do not need it that soft, so 1 to 1 works well and keeps total water under control.
Suggested procedure:
- Weigh out dry TVP required for the batch.
- Add equal weight of 50°C water (1 to 1).
- Hydrate for 30 minutes.
- Drain only free surface water.
- Chill the hydrated TVP to below 5°C before adding to the cutter.
In the recipe above, 18.95 kg hydrated TVP contains about:
- 9.48 kg dry TVP
- 9.48 kg hydration water
Total added water in this system
Assuming:
- Hydrated beef skin ≈ one third skin, two thirds water
- Hydrated TVP ≈ half TVP, half water
Then, for 100 kg finished batter:
- Water from hydrated skin ≈ 18.95 × 2/3 ≈ 12.6 kg
- Water from hydrated TVP ≈ 18.95 × 1/2 ≈ 9.5 kg
- Free ice water added = 4.74 kg
Total added water ≈ 26.8 kg, so about 26.8 percent added water on this set of assumptions, which is close to your target and should still give good firmness and very low cook loss.
RECIPE 3
Vienna Sausage (Fine Emulsion)
Chicken Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| Chicken meat | 45.00 | 45.00% |
| Hydrated beef skin | 25.00 | 25.00% |
| Ice cold water | 25.00 | 25.00% |
| Salt | 1.40 | 1.40% |
| Sodium bicarbonate | 0.30 | 0.30% |
| Potato starch | 2.60 | 2.60% |
| Optional isolate | 1.50 | 1.50% |
| Spices | 0.50 | 0.50% |
| Total | 101.30 kg | 101.30% |
MDM Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| MDM | 50.00 | 50.00% |
| Hydrated beef skin | 25.00 | 25.00% |
| Chicken meat | 10.00 | 10.00% |
| Ice cold water | 13.00 | 13.00% |
| Salt | 1.40 | 1.40% |
| Sodium bicarbonate | 0.35 | 0.35% |
| Potato starch | 2.60 | 2.60% |
| Spices | 0.50 | 0.50% |
| Total | 102.85 kg | 102.85% |
Science explanation
The article highlights that carrageenan stabilises emulsions and improves WHC.
Beef skin performs a similar role when cooked due to its conversion to gelatin.
Starch ensures low cook loss due to its swelling and gel integrity.
Salt and bicarbonate ensure a fully extracted protein matrix.
RECIPE 4
Polony
Chicken Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| Chicken meat | 40.00 | 40.00% |
| Hydrated beef skin | 30.00 | 30.00% |
| Ice cold water | 26.00 | 26.00% |
| Salt | 1.50 | 1.50% |
| Sodium bicarbonate | 0.30 | 0.30% |
| Potato starch | 2.00 | 2.00% |
| Colour + spice | 0.50 | 0.50% |
| Total | 100.30 kg | 100.30% |
MDM Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| MDM | 50.00 | 50.00% |
| Hydrated beef skin | 30.00 | 30.00% |
| Ice cold water | 16.00 | 16.00% |
| Salt | 1.50 | 1.50% |
| Sodium bicarbonate | 0.35 | 0.35% |
| Potato starch | 2.00 | 2.00% |
| Colour + spice | 0.50 | 0.50% |
| Total | 100.35 kg | 100.35% |
Science explanation
Polony is a fully comminuted cooked system.
Petracci stresses that starch reduces cooking loss significantly and improves gel stability in high extension products.
Beef skin contributes to sliceability and reduces purge through its collagen network.
RECIPE 5
Nuggets (Restructured)
Chicken Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| Chicken meat | 55.00 | 55.00% |
| Hydrated beef skin | 10.00 | 10.00% |
| Ice cold water | 15.00 | 15.00% |
| Salt | 1.20 | 1.20% |
| Sodium bicarbonate | 0.25 | 0.25% |
| Potato starch | 18.00 | 18.00% |
| Spices | 0.80 | 0.80% |
| Total | 100.25 kg | 100.25% |
MDM Version
| Ingredient | Inclusion (kg) | Percentage |
|---|---|---|
| MDM | 50.00 | 50.00% |
| Hydrated beef skin | 10.00 | 10.00% |
| Chicken meat | 10.00 | 10.00% |
| Ice cold water | 12.00 | 12.00% |
| Salt | 1.20 | 1.20% |
| Sodium bicarbonate | 0.30 | 0.30% |
| Potato starch | 17.00 | 17.00% |
| Spices | 0.80 | 0.80% |
| Total | 101.30 kg | 101.30% |
Science explanation
The nugget matrix is thick and high in starch.
According to Petracci, cereal flours and starches improve:
• forming characteristics
• cooked firmness
• hot and cold stage WHC
Beef skin strengthens the internal matrix.
Bicarbonate increases juiciness by shifting pH before par-fry and final cooking.
Whole Chicken Brine Application
Recommended brine (per 100 kg whole chicken)
Water…………………… 12.0 kg
Salt……………………… 1.2 kg
Sodium bicarbonate… 0.30 kg
Starch (optional)…… 1.0 kg
Application
• Paddle mix or tumble for 20 to 25 minutes
• Rest 30 minutes
• Smoke and cook to 71°C
Expected behaviour
• Higher pH increases water retention
• Starch reduces surface drip
• Skin browns better
• Zero or minimal moisture loss
Summary
The science from Petracci confirms the central role of starch and collagen-based systems for water retention and gel stability.
Your practical formulations integrate:
• starch as the primary scientifically proven WHC tool
• beef skin as a validated collagen-based binder
• bicarbonate and salt as pH and extraction drivers
• water levels that achieve firm texture and minimal cook loss
• tables that allow direct scale-up to production