Methods of preparation of khoa
Khoa is a traditional Indian dairy product used as a base for many sweets. For food consultants, food processing consultants, and dairy industry professionals, understanding the various methods of khoa production is crucial for setting up efficient, compliant, and high-quality production lines.
Overview of Khoa Manufacturing Methods
There are four major methods for khoa production:
- Traditional method
- Improved batch method
- Mechanized method
- Membrane technology (emerging)
Each method varies based on scale, efficiency, equipment, and output quality—making method selection essential for food manufacturing consultants and dairy processing plant design experts.
Traditional Method of Khoa Making
This labor-intensive method is still prevalent in small-scale dairy units.
- Buffalo milk is preferred for higher yield, soft body, and sweet taste.
- Cow milk results in slightly pasty khoa due to higher chloride levels.
- Approx. 4 L buffalo milk or 5 L cow milk = 1 kg khoa.
Procedure:
- Milk is boiled in a heavy iron pan (karahi).
- Stirring with an iron scraper (khunti) prevents burning.
- As water evaporates, the thickened mass is cooled and molded.
🚫 Limitations:
- Labor- and time-intensive
- Inconsistent quality
- Smoky flavor
- Not suitable for large-scale food processing factories
Types of Khoa Produced
Dhap Khoa
- Stopped at rabri stage
- Soft grains and high moisture
- Used in kalakand, milk cake
Pindi Khoa
- Extended heating post-rabri
- Smooth, molded texture
- Common in barfis
Danedar Khoa
- Grainy texture from slightly soured milk
- Achieved by adding citric acid or sour whey
- Used in pedas
Improved Batch Method (For Small Food Businesses)
A more controlled approach ideal for medium-scale dairy plants.
- Uses steam-heated stainless steel kettles
- Enhances hygiene and avoids smoky flavor
- Maintains product uniformity
Technical Specs:
- Cow milk: 4.5% fat
- Buffalo milk: 5.5% fat
- Batch time: ~15–20 minutes
Mechanized Processes for Khoa Production
A must for food technology consulting and food industry consultants involved in scaling operations.
3.1 Continuous Khoa-Making Machine
- Steam-jacketed cylinder + cascading pans
- Total solids raised from 30% to 70% in ~25 minutes
3.2 Roller Dryer Method
- Uses vacuum-concentrated milk
- Steam: 25–30 psi
- Challenge: Inconsistent texture
3.3 Scraped Surface Conical Vat
- Capacity: 40–80 kg milk per batch
- Time: 14–50 min
- Challenge: High initial loss
3.4 Contherm–Convap System (Alfa Laval)
- Efficient milk concentration unit
- Steam pressures: 3–4 kg/cm²
- Throughput: 300–350 kg/hour
- Limitation: Lack of traditional flavor and texture
3.5 Thin Film Scraped Surface Heat Exchanger (TSSHE)
- Divided steam jacket for gradual heating
- Handles up to 50 kg/hour
- Ensures grainy khoa texture, scalable process
3.6 Inclined Scraped Surface Heat Exchanger (ISSHE)
- Rotor speed: 40–80 rpm
- Steam pressure: 1.0–1.5 kg/cm²
- Suitable for continuous khoa production
✅ Advantages:
- Uniform quality
- Flexible operations
- Minimal product loss
- Easy automation
- Hygienic enclosed system
Chemical Quality of Khoa
For regulatory compliance and food consultancy services, maintaining the legal standards is critical:
- Cow milk khoa: Minimum 4.4% fat
- Buffalo milk khoa: Minimum 5.5% fat
Quality control should be a focus for food manufacturing consultants and auditing teams to ensure FSSAI compliance.
Constituents (%
Market
Food Consulting Insights
- Food processing consultants can help design and implement continuous systems that optimize yield and quality.
- Food business consultants must advise on compliance with regulatory norms and shelf-life standards.
- Engineering consultants should design plant layouts incorporating mechanized khoa systems.
Frequently asked
How much milk do I need per kg of khoa, and does buffalo or cow milk give better results?
For khoa production, roughly 4 L of buffalo milk or 5 L of cow milk yields 1 kg of khoa. Buffalo milk is preferred because it gives higher yield, a soft body and sweet taste. Cow milk produces a slightly pasty khoa due to its higher chloride levels. Legal minimums are 4.4% fat for cow milk khoa and 5.5% fat for buffalo milk khoa.
Why is the traditional karahi method unsuitable for a large khoa plant?
The traditional method boils milk in a heavy iron pan (karahi) with stirring by an iron scraper (khunti) until the mass thickens, is cooled and moulded. It remains common in small-scale dairy units but is labour- and time-intensive, gives inconsistent quality and a smoky flavour, and is not suitable for large-scale food processing factories.
What does the improved batch method change for a medium-scale dairy?
The improved batch method for khoa uses steam-heated stainless steel kettles instead of open iron pans. This improves hygiene, avoids the smoky flavour of traditional khoa and maintains product uniformity, making it suitable for medium-scale dairy plants. Typical inputs are cow milk at 4.5% fat or buffalo milk at 5.5% fat, with a batch time of about 15 to 20 minutes.
Which mechanised khoa systems should we compare, and what throughput does each give?
Options for mechanised khoa include the continuous khoa-making machine (steam-jacketed cylinder with cascading pans, raising total solids from 30% to 70% in about 25 minutes), the roller dryer using vacuum-concentrated milk at 25 to 30 psi steam, the scraped surface conical vat at 40 to 80 kg milk per batch in 14 to 50 minutes, the Contherm-Convap system at 300 to 350 kg/hour with 3 to 4 kg/cm² steam, the TSSHE at up to 50 kg/hour, and the ISSHE at 40 to 80 rpm rotor speed.
We want grainy danedar khoa at scale. Which equipment holds that texture?
The Thin Film Scraped Surface Heat Exchanger (TSSHE) uses a divided steam jacket for gradual heating, handles up to 50 kg/hour and ensures a grainy khoa texture in a scalable process. Danedar khoa itself gets its grainy character from slightly soured milk, achieved by adding citric acid or sour whey, and is used in pedas.
What are the known drawbacks of mechanised khoa routes we should plan around?
Each mechanised khoa route has a specific limitation: the roller dryer method gives inconsistent texture, the scraped surface conical vat suffers high initial product loss, and the Contherm-Convap system lacks the traditional flavour and texture. Against these, mechanised systems offer uniform quality, flexible operations, minimal product loss, easy automation and a hygienic enclosed system.
CITE THIS
PMG Engineering. (2023). Methods of preparation of khoa. PMG Engineering. https://pmg.engineering/Article/235/methods-of-preparation-of-khoa/