Synthetic milk or urea adulterated milk is a big problem in India since long, in 1996 we developed a protocol to detect synthetic milk at GBPU&T, Pantnagar. However, since then lot many improvements might have occurred. What are the improvements over the old method which was as under:
How to detect synthetic milk at your home: नकली दूध की जाँच घर पर कैसे करें
https://plus.google.com/112955465211109929462/posts/KWmxh5vsUha
This is the formula used in most of the laboratories
एक बूँद दूध में रीजेंट की एक बूँद मिलाएँ (सफेद रंग की चीनी मिट्टी की प्लेट पर) यदि दस सेकेंड के अंदर पीला रंग बने तो समझो कि दूध में नकली दूध की मिलावट है और यदि दूध में हरापन आ जाए तो समझो दूध पूरा ही नकली है.
रीजेंट: 50 मिलीलीटर शुद्ध अल्कोहल में 1 ग्राम अति-शुद्ध p-अमीनो-बेंज्ल्डी-हाइड मिलाएँ फिर उसमें 50 मिलीलीटर शुद्ध हाइड्रो-क्लोरिक धीरे-धीरे मिलाएँ और एक हरे या भूरे रंग की ड्रॉपर वाली शीशी में रखें. यह रीजेंट 3 महीने तक ठीक कार्य करता है,
In a drop of milk add a drop of reagent (do it on white porcelain plate): Yellow colour develops within 10 seconds if milk adulterated with synthetic milk, colour may even be green if it is purely synthetic.
Reagent: p-Dimethylaminobenzaldehyde (1 gm) is dissolved in pure alcohol (50 ml) and then concentrated hydrochloric acid (50 ml) is added. Keep the reagent in brown or green glass dropper. The reagent possesses a pale colour and is stable for months together.
https://plus.google.com/112955465211109929462/posts/KWmxh5vsUha
Dear Bhoj Singh
Good knowledge, अच्छी जानकारी
Test for detection of urea
1. Urea is generally added in the preparation of synthetic milk to raise the SNF value.
Five ml of milk is mixed well with 5 ml paradimethyl amino benzaldehyde (16%). If the solution turns yellow in colour, then the given sample of milk is added with urea.
2. Take 5 ml of milk in a test tube and add 0.2 ml of urease (20 mg / ml). Shake well at room temperature and then add 0.1 ml of bromothymol blue solution (0.5%). Appearance of blue colour after 10-15 min indicates the adulteration milk with urea.
Regards,
Prem Baboo
http://fda.up.nic.in/household_tests.htm
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