Maximizing Yield: Factors Affecting Paneer and Chhana Production

Paneer and chhana are two of the most important traditional dairy products in South Asia. Both are made by heat-acid coagulation of milk, yet the amount of final product you get from a given quantity of milk – known as yield – can vary significantly. Several factors determine whether you end up with more or less product per liter of milk. Understanding these factors is essential for anyone involved in dairy processing, from small-scale sweet shops to large commercial dairies.

What does yield mean in paneer and chhana production? 🔗

Yield refers to the weight of finished product obtained from a specific quantity of raw milk, expressed as a percentage. For example, if you process 100 kg of milk and obtain 18 kg of paneer, the yield is 18%. This number matters because it directly impacts profitability and resource efficiency. As a general benchmark, cow milk yields about 16-17% paneer, while buffalo milk yields around 19-20%. For chhana, cow milk produces roughly 20% yield and buffalo milk gives about 25%. The difference between these numbers comes down to a handful of controllable and compositional factors.

Type of milk: cow vs. buffalo 🔗

The type of milk is the single most influential factor in determining yield. Buffalo milk consistently outperforms cow milk, and the reason is straightforward – it contains more solids. Buffalo milk typically has 6-8% fat and around 16-18% total solids, while cow milk has 3-4% fat and about 12-13% total solids. Since paneer and chhana production is essentially a process of concentrating milk solids by removing water and whey, starting with more solids means ending up with more product.

Beyond fat content, buffalo milk has higher casein and mineral (calcium, phosphorus) levels, which contribute to firmer curd formation and better solids recovery. Cow milk paneer tends to be softer and more fragile, while buffalo milk paneer is firm, cohesive, and better suited for cooking applications like frying. For chhana, cow milk is actually preferred for sweet-making (like rasogolla) because it produces a softer, smoother product. However, in terms of pure yield, buffalo milk delivers more.

Mixed milk as a practical solution 🔗

Many manufacturers blend cow and buffalo milk to balance yield, texture, and cost. A 1:1 blend of cow and buffalo milk standardized to 5% fat has been found to produce paneer of superior quality compared to cow milk paneer alone. This approach offers a practical middle ground – better yields than pure cow milk, with improved textural properties.

Total solids content and fat-to-protein ratio 🔗

Total solids content is one of the most reliable predictors of yield. It includes all components of milk except water – proteins, fats, lactose, and minerals. The relationship is direct: higher total solids generally lead to higher yields. According to a comprehensive review published in the International Dairy Journal, milk with more than 6% fat will generally give a higher yield of paneer.

However, it is not just the quantity of total solids that matters – the ratio of fat to protein is equally important. This ratio influences how well the curd forms, how it retains moisture, and how much solid matter is lost in the whey. Research from a study on milk protein standardization showed that adjusting the protein-to-fat ratio to 0.68 using milk protein concentrate (MPC60) increased paneer yield from 18% (control) to 28%. Skimmed milk powder (SMP) and sodium caseinate also boosted yields to around 26%.

Manufacturing conditions that affect yield 🔗

Even with the best quality milk, poor processing practices can significantly reduce yield. Several manufacturing parameters need careful control.

Heat treatment of milk 🔗

Heating milk before coagulation serves multiple purposes: it destroys harmful bacteria, denatures whey proteins, and changes the calcium phosphate balance. When milk is heated to around 85-90°C, whey proteins denature and get retained in the curd as co-precipitates, which improves both yield and body texture. Without sufficient heat treatment, these whey proteins would be lost in the whey, reducing the total solids recovery. However, rapid or excessive heating can damage proteins in ways that impair curd formation. The recommended practice for buffalo milk paneer is heating to 90°C without holding, then bringing the temperature down to 70°C before adding the coagulant.

Coagulation temperature 🔗

The temperature at which the acid is added to milk significantly affects yield. For paneer, a coagulation temperature of 70°C has been suggested as most effective, though good quality paneer can also be made at 80°C. For cow milk paneer, coagulation at 80-90°C with citric acid is often recommended to compensate for its lower casein levels.

For chhana, the temperature requirements differ slightly depending on milk type. The recommended coagulation temperature is 80-85°C for cow milk chhana and 70-80°C for buffalo milk chhana. Too high a temperature leads to grainy texture, while too low a temperature results in sticky, difficult-to-work-with chhana.

pH of coagulation 🔗

The pH at which coagulation occurs is a critical control point. For paneer, the optimum pH range is 5.30-5.35 for buffalo milk and around 5.0-5.2 for cow milk. Coagulating above pH 5.4 results in a flat-flavored product with a soft, crumbly body. Coagulating below pH 5.2 (for buffalo milk) produces hard, coarse-textured paneer. The optimum pH ensures maximum total solids recovery and the best sensory properties simultaneously.

Type and concentration of coagulant 🔗

The choice of coagulant has a measurable impact on yield. Citric acid at 1-2% concentration is the most widely used coagulant for both paneer and chhana. For cow milk, approximately 2.34 g of citric acid per kg of milk is needed, while buffalo milk requires slightly less – about 2.1 g per kg. Using excess coagulant increases acidity, causes a harder texture, and leads to greater solids loss in the whey. Some studies have shown that calcium lactate can yield the highest amount of chhana compared to citric acid and lactic acid, while also producing better body and texture for sweet-making.

Moisture retention: the yield-quality balancing act 🔗

Moisture content directly influences yield – more moisture in the product means a heavier final product. But this is a delicate balance. According to the Food Safety and Standards Act (FSSA), both paneer and chhana must not exceed 70% moisture, with a minimum of 50% fat on dry matter basis. The Bureau of Indian Standards (BIS) sets an even stricter maximum of 60% moisture for paneer.

In practice, paneer typically contains 50-55% moisture, while chhana retains 55-60% moisture. Pressing is the key step that controls moisture in paneer – the curd is filled into hoops and pressed for 10-20 minutes. For chhana, no external pressure is applied; whey is removed simply by hanging the coagulated mass in muslin cloth. The method and duration of straining directly affects moisture retention and, therefore, yield. Delayed straining (letting the curd cool in the whey before draining) results in higher moisture retention and improved yield compared to immediate straining.

Techniques to improve yield 🔗

Beyond controlling the basic process variables, several advanced techniques can significantly boost yield without compromising product quality.

Fortification with milk solids 🔗

Adding skimmed milk powder (SMP) to buffalo milk before processing has been shown to increase paneer yield from about 18% to 24.4%. Similarly, using milk protein concentrate (MPC60) or sodium caseinate boosts both total solids content and the protein available for coagulation. This approach is particularly useful when working with milk that has lower-than-ideal solids content.

Ultrafiltration (UF) 🔗

Membrane technology, particularly ultrafiltration, offers one of the most significant yield improvements available. Concentrating standardized milk to about 27% total solids through UF before paneer-making can increase yield by approximately 25%. This happens because UF retains whey proteins that would normally be lost in the conventional process. The concentrated retentate can be acidified and texturized using microwave or conventional heating, producing a product with uniform quality and extended shelf life.

Use of additives 🔗

Small additions of certain compounds can meaningfully affect yield. Adding 0.08-0.15% calcium chloride to cow milk before coagulation improves total solids recovery and yield. Hydrocolloids such as sodium alginate, carrageenan, and pre-gelatinized starch at 0.1-0.15% levels help trap more solids in the curd matrix. Homogenization of cow milk also improves paneer yield and sensory quality by creating smaller, more uniform fat globules that are better retained during coagulation.

Reverse osmosis (RO) 🔗

Concentrating milk through reverse osmosis to 1.5-2 times its original total solids level has been found to increase paneer yield by 2-3% on an original milk basis, without negatively affecting sensory properties. While this requires specialized equipment, it offers a viable path for larger dairy operations looking to maximize output.

Seasonal and supply chain factors 🔗

Milk composition is not constant throughout the year. Research has shown that the quality characteristics of chhana vary with milking season, with differences in protein, fat, and mineral content between summer and winter milk affecting yield, texture, and firmness. Chhana made from winter milk may have different total solids recovery compared to summer milk. Dairy processors need to adjust their standardization and process parameters seasonally to maintain consistent yields.

Working closely with milk suppliers to ensure proper animal nutrition and milking hygiene also plays a role. Fresh, high-quality milk with normal titratable acidity (below 0.20% lactic acid) is essential. Acidic or adulterated milk produces inferior products with lower yields and poor quality.

Summary of key yield figures 🔗

To put the numbers in perspective: from 100 kg of milk, the expected product output is approximately as follows. Cow milk gives 16-17 kg of paneer or about 20 kg of chhana. Buffalo milk gives 19-20 kg of paneer or about 25 kg of chhana. With fortification and advanced processing techniques like ultrafiltration, these figures can increase by 25% or more. Every percentage point of yield improvement translates directly to better economics and more efficient use of a valuable raw material.

What do you think? Given that buffalo milk gives higher yield but cow milk chhana is preferred for making sweets like rasogolla, how should a dairy entrepreneur decide which milk type to prioritize? And with advanced techniques like ultrafiltration becoming more accessible, could small-scale processors realistically adopt them to compete with large organized dairies?

References

1. https://egyankosh.ac.in/bitstream/123456789/9526/1/Unit-6.pdf
2. https://ebooks.inflibnet.ac.in/ftp04/chapter/traditional-indian-dairy-products-chhana-based-sweetmeats/
3. https://ebooks.inflibnet.ac.in/ftp04/chapter/technology-of-paneer/
4. https://www.sciencedirect.com/science/article/abs/pii/S0958694624001584
5. https://www.sciencedirect.com/science/article/pii/S2772502223000252
6. https://courseware.cutm.ac.in/wp-content/uploads/2020/11/Paneer-and-Khoa.pdf
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC4348269/
8. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/paneer
9. https://pmc.ncbi.nlm.nih.gov/articles/PMC3551056/
10. https://pubmed.ncbi.nlm.nih.gov/32909288/