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01/10/24 10:23 AM IST

Fat present in Tirupati laddus

In News
  • A technical report from the Centre for Analysis and Learning in Livestock and Food (CALF)  analysed samples of ghee supplied to the Tirumala Tirupati Devasthanams, the manager of the shrine, found that it was adulterated.
Adulterated milk
  • Milk fat, like all organic fats, consists of triglycerides. They are glycerols connected to fatty acids and the carbon chains that constitute them are a characteristic feature of triglycerides.
  • There are ‘short chain,’ ‘medium chain’ and ‘long chain’ fatty acids defined by the number of carbon atoms in these chains.
  • Milk fat has more than 400 structurally different fatty acids and can combine in various ways to form thousands of triglyceride molecules.
  • Thus, triglyceride patterns in cow ghee differ from the ghee made from goat milk, lard, soya bean or other vegetable oils.
  • Given that cow ghee is expensive, adulterating it with cheaper fat is an age-old practice, and an array of methods have evolved to detect adulteration.
  • For precision, the state-of-the-art method in the dairy industry is the use of gas chromatography.
  • This method can be used to separate the chemical constituents of a sample mixture made up of organic compounds.
  • These machines are expensive and can cost ₹30-40 lakh but are the standard in reputed outlets.
  • Much like an electrocardiogram generates a signal of oscillating waves meant to represent heart beats, the result of a gas chromatography analysis of a sample of ghee is a characteristic wave form that shows the proportion of different types of triglycerides.
  • Pure cow ghee has a characteristic pattern different from vegetable oil or lard (pig fat). 
Adulteration analysis
  • For adulteration analysis, the German scientist Dietz Precht, in 1991, came up with a set of five equations.
  • Each of them generated an ‘s value’ (standard value) and can be used to determine specific adulterations.
  • The value from s1 points to adulteration with soya bean, sunflower oil, rapeseed, fish oil; s2 to coconut and palm kernel fat; s3 to palm oil and beef tallow; s4 to lard and s5 to the total adulterated fat in a given specimen.
  • For a ghee sample to be pure cow ghee, all five of these values must lie in a specified range that’s within a window of 3 or 4 points to 100. However, even if one of these values lies outside the prescribed range, it points to the presence of a ‘foreign fat.’
  • This process is the standard protocol recommended by the International Standards Organisation (ISO) and followed in reputed Indian laboratories such as CALF. 
Source- The Hindu

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