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High Protein Leucine
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Today’s Task
What We did Today?
Event: Formulation of High-Protein Leucine-Enriched Egg Protein powder
The objective of today’s formulation work was to develop and compare two high-protein leucine-enriched egg protein powder variants—an unflavoured formulation and a chocolate-flavoured formulation. Both variants were evaluated to optimize protein incorporation, leucine fortification, powder dispersibility, and reconstitution performance while maintaining the targeted nutritional profile. Comparative assessment of physicochemical properties, ingredient compatibility, and sensory characteristics was carried out to identify the formulation with the best balance of functionality and consumer acceptability
😊 How I Felt Before Starting
I was eager to develop a high-protein leucine-enriched egg protein powder that combined high nutritional value with excellent functional performance and consumer acceptability. I anticipated challenges in incorporating a high level of egg protein and leucine while maintaining good powder dispersibility, protein solubility, and ease of reconstitution. I was particularly interested in comparing the unflavoured and chocolate-flavoured variants to understand how flavour incorporation influenced ingredient compatibility, sensory quality, and overall formulation performance. I expected the formulation trials to provide valuable insights for identifying the optimized variant with the best balance of nutritional quality and functionality of the product.
Product Formulation Plan
The formulation study was to develop and compare two high-protein leucine-enriched egg protein powder variants to identify the formulation with the best balance of nutritional performance, reconstitution properties, and sensory acceptability.
The formulation development covered:
- Develop and compare multiple formulation variants to identify the most suitable composition for a high-protein egg protein beverage with added leucine.
- Optimize egg protein incorporation to achieve the targeted protein content while maintaining a homogeneous beverage system.
- Optimize L-leucine fortification to enhance the amino acid profile while ensuring ingredient compatibility and acceptable sensory characteristics.
- Optimize protein solubility and dispersion to minimize aggregation and sedimentation while improving beverage consistency and drinkability.
- Characterize the physicochemical properties of the optimized formulation to verify formulation consistency, ingredient compatibility, and processing suitability.
- Evaluate sensory attributes to identify the formulation with the best balance of appearance, aroma, flavour, mouthfeel, and overall acceptability.
Key Steps Followed During Product Development
Variant 1 was developed as an unflavoured baseline formulation to optimize egg protein incorporation, leucine fortification, and powder functionality. Variant 2 was developed as a chocolate-flavoured formulation, incorporating a cocoa-based flavour system to improve flavour, reduce residual egg notes, and enhance overall consumer acceptability while maintaining the targeted nutritional profile. Both variants were subsequently evaluated and compared based on their physicochemical properties, protein solubility, reconstitution performance, ingredient compatibility, and sensory characteristics to identify the optimized formulation for further product development.
Egg protein concentration and mixing conditions were optimized in both variants to achieve the targeted protein content while maintaining good powder flowability, rapid reconstitution, and uniform protein dispersion after mixing.
L-leucine was incorporated at the targeted level in both variants, and the formulation was optimized to ensure uniform distribution while minimizing bitterness and maintaining compatibility with the egg protein matrix and flavour system.
Hydration conditions, mixing sequence, and formulation pH were optimized to improve protein solubility and powder dispersibility after reconstitution, reducing aggregation and sediment formation while producing a smooth and homogeneous drink. Evaluation was performed using applicable AOAC Official Methods.
Both variants were evaluated for pH, viscosity, density, protein solubility, sedimentation, and physical homogeneity to compare formulation performance and verify suitability for processing and subsequent product development.
The reconstituted unflavoured and chocolate-flavoured variants were evaluated for appearance, flavour, mouthfeel, and overall acceptability using the 9-point Hedonic Scale. The comparison was performed to determine the formulation that provided the best balance of nutritional quality, reconstitution performance, and consumer acceptability while minimizing chalkiness, bitterness, and residual egg flavour.
📚 What I Learned?
Observations & Learnings
- Evaluating different egg protein levels (25, 27.5, and 30 g per serving) showed that 30 g per serving achieved the targeted nutritional profile while maintaining acceptable dispersion and drinkability. Higher protein levels increased viscosity and chalkiness, whereas lower levels did not meet the nutritional target.
- Optimizing L-leucine incorporation (4.0, 4.5, and 5.0 g per serving) demonstrated that 5.0 g provided the desired amino acid profile. However, leucine levels above the optimized concentration produced noticeable bitterness, requiring flavour optimization.
- Maintaining the formulation pH between 6.8 and 7.0 improved egg protein hydration and reduced protein–protein interactions, resulting in better protein solubility, more uniform dispersion, and lower sediment formation.
- Selecting a near-neutral pH (6.82–6.94) maintained egg protein functionality and minimized interactions between egg protein and added leucine, producing a more homogeneous beverage with consistent processing characteristics.
- The chocolate-flavoured formulation effectively masked residual egg notes and leucine bitterness through its stronger flavour profile, resulting in improved mouthfeel and higher overall sensory acceptability compared with the unflavoured formulation.
Outcome (Analysis Table)
Interpretation
Comparative evaluation of the two formulation variants demonstrated that the chocolate-flavoured variant exhibited superior overall formulation performance. It achieved higher protein solubility (98.2% vs. 95.8%), lower sedimentation (0.8% vs. 2.1%), reduced viscosity (215 cP vs. 235 cP), and greater physical homogeneity (99.0% vs. 97.5%), indicating improved powder dispersibility and reconstitution characteristics. Sensory evaluation further showed higher scores for appearance (8.5/9), aroma (8.4/9), flavour (8.4/9), mouthfeel (8.6/9), and overall acceptability (8.6/9) compared with the unflavoured variant. Based on the combined physicochemical and sensory performance, the chocolate-flavoured variant was selected as the optimized formulation for further pilot-scale development and quality evaluation.
✅ What Went Well?
- Successfully developed both unflavoured and chocolate-flavoured high-protein egg protein powder variants meeting the target of 30 g protein and 5 g L-leucine per serving.
- Identified the chocolate-flavoured variant as the optimized formulation based on superior overall formulation performance and consumer acceptability based on sensory evaluation.
- Achieved a stable reconstituted product with high protein solubility (98.2%) and low sedimentation (0.8%), demonstrating good formulation robustness.
- Produced a formulation with 99.0% physical homogeneity, ensuring uniform ingredient distribution after reconstitution.
- Generated comprehensive formulation and analytical data to support pilot-scale optimization and subsequent quality validation.
What Could I Have Done Better?
- Continue improving flavour-masking strategies to further reduce residual egg notes while maintaining the targeted nutritional profile.
- Further optimize the stabilizer system to improve suspension stability during extended storage after reconstitution.
- Validate the optimized formulation through long-term real-time shelf-life studies under different storage conditions.
- Further optimize processing conditions to improve powder flowability, dispersibility, and manufacturing efficiency.
- Apply Design of Experiments (DoE) to optimize ingredient interactions and improve formulation robustness during scale-up.
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