Milk Adulteration Testing in India Before the Festive Season

The dairies are busiest the few weeks leading up to Diwali. Milk, khoa, paneer, ghee, sweets demand are on the rise rapidly. The milk must be faster from the farms to the processors and there's not as much time to check it. 

This is also when the risk of adulteration is highest. For dairy QC labs, testing during this period matters more than at any other time of the year.

This guide is for QC analysts, lab heads and purchase teams at dairies and food testing labs. It covers what to test, which test kits to use, and what to check before you buy them.
 

What to test for in milk

Milk problems usually fall into three groups.

1. Things added to increase volume

• Water, often mixed with starch, sugar or glucose so the milk still looks thick
• Urea, to make the milk look richer in protein
• Detergent, to give diluted milk a creamy look
• Milk powder mixed with water and sold as fresh milk

2. Things added to hide spoilage or make milk last longer

• Formalin and hydrogen peroxide
• Baking soda and washing soda, to hide sour milk

3. Things that get into milk by accident

• Antibiotic residues, when milk is taken from animals still on medicine
• Aflatoxin M1, which comes into milk when cattle eat fungus-affected feed

Many labs focus only on water, urea and detergent. However, the National Milk Safety and Quality Survey 2018 conducted by FSSAI revealed that antibiotic residues and aflatoxin M1 were more worrisome than added adulterants. These are more difficult to identify and pose more serious health and compliance threats. 
 

Don't skip antibiotic and aflatoxin tests

When milk volumes go up, antibiotic testing is often the first test labs cut. This is a mistake. FSSAI has established a limit for antibiotic residues in milk. Residues also inhibit the setting of curd and cheese, resulting in loss of production. 

Aflatoxin M1 is resistant to boiling and pasteurisation. Fungus is more likely to grow on cattle feed during the monsoon than during other seasons.  So, milk collected just before the festive season needs more testing, not less.
 

Rapid test kits vs lab testing

Rapid kits and lab tests do different jobs. A good QC lab uses both.

 The simple approach for the festive season: test every batch with rapid kits at reception, send positive samples for lab confirmation, and keep all records together. For the kits labs use for this, see our guide on milk quality testing kit India.

FSSAI rules and testing

FSSAI sets the standards for milk quality and the safe limits for residues. Food safety officers usually increase milk sampling before big festivals. Dairies and labs should expect more checks during this time.

To stay compliant, focus on three things:

1. Use test kits that can detect at or below FSSAI limits

2. Keep a record of every batch tested, with the kit lot number

3. Send positive samples for confirmation testing

FSSAI's DART book (Detect Adulteration with Rapid Test) is good for home checks. It does not replace proper test kits in a dairy lab.
 

A simple festive-season testing plan

1. Perform strip tests for common adulterants upon arrival of milk – smell, temp, density. 

2. Before unloading a tanker: run a rapid antibiotic test

3. Every day or every batch: Sample for the presence of aflatoxin M1 particularly with new or high-risk suppliers 

4. For milk products: In festivals, adulteration increases in test khoa, paneer and ghee. 

5. If a test is positive: Send the sample to a laboratory for confirmation and note the supplier and batch number 

Also plan your stock early. If test kits run out in the middle of the season, labs are forced to test less at the worst possible time.
 

What to check before buying milk test kits

• Detection limit: can the kit detect at or below the FSSAI limit?
• Test data: ask for the manufacturer's accuracy data
• Sample type: is the kit made for raw milk, processed milk or milk products?
• Storage: many kits need to be kept at 2–8°C; make sure they are delivered cold
• Documents: every order should come with a certificate of analysis, lot number and instructions
• Stock: check that the supplier can deliver repeat orders through the season

Buying from one life science products supplier India for all your test kits also makes ordering, documents and delivery easier to manage.
 

Buying milk test kits in India

Biochain incorporated is an ISO 9001:2015 Certified Distributor based at New Delhi. We supply rapid test kits and ELISA kits to dairy labs, food testing labs and milk processors across India. As a milk rapid testing kit supplier in India, we enable labs to select the appropriate kit for the adulterants, antibiotic residues and aflatoxin M1, and prepare for the festive stock before that. 

Planning stock for the festive season? Tell us what you test for, how many samples you run and where you are located. We will send you a quote.
 

FAQs
 

1. The most common milk adulterants tested in Indian dairy labs? 

Added water, starch, sugar, urea, detergent, neutralisers such as sodium carbonate, and preservatives such as formalin and hydrogen peroxide. Labs should also screen for antibiotic residues and aflatoxin M1, which are contaminants rather than deliberate adulterants.

2. Can rapid test kits replace laboratory testing for milk? 

No. Rapid kits are designed for fast screening at reception or batch level. Where results are used in regulatory reporting, positive results should be confirmed by HPLC or LC-MS/MS. 

3. Does boiling or pasteurisation remove aflatoxin M1 from milk? 

NO. Aflatoxin M1 is heat stable and will withstand pasteurisation and boiling. It must be controlled by changing the quality of the feed and by the filtration of the milk. 

4. What should I check before buying milk antibiotic residue test kits? 

Ensure that detection limits compliment the FSSAI maximum residue limits, the classes of antibiotics the kit detects, the matrix it is validated for, that it can withstand storage conditions, and that a certificate of analysis accompanies every lot.

5. Does Biochain supply milk test kits outside Delhi? 

Yes. Biochain Incorporated supplies rapid test kits and ELISA kits to dairy and food testing labs across India, with cold-chain delivery for kits that need refrigerated storage