Refractive index of milk?
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The refractive index of milk is 1.3440 to 1.3485 and can be used to estimate total solids.
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to external factors. For cow milk, K normally ranges from 0.2065 to 0.2075, and for buffalo milk from 0-2076 to 0"2088. The modes, 0"2070 for cow and 0" 2080 for buffalo milk are also quite distinct from each other. Further, the range of K, unlike that of R.I., is practically the same for both
milk with very high refractive index can thus be diluted to the extent of about 25 per cent., and with normal values to about 15 per cent. of added water. And it is here that the refractive constant comes in as a handy weapon. Further, judgment only on the basis of refractive index suffers from the
From the density and R.I. the refractive constant, K, has been calculated. The R.I. and K of more than 200 samples each of cow and buffalo milk have been tested over a period of 8 months. The limits of R.I. for cow milk lie between 1·3449 and 1·4480, the mode being 1·3463, and for buffalo milk between 1·3461 and 1·3500, the mode being 1·3480.
Surface plasmon reso- nance is possible only when the real part of the per- mittivity of the metal is negative and Re ε 1 < −n 2 2 .In such a case, the effective refractive index of the milk can be found from the formula (Chen and Chen, 1981; Ra¨ther, 1988): n 0 sinθ = √ Reε 1 n 2 2 Reε 1 + n 2 2 , [13] where Re ε 1 is the real part of the complex permittivity of the metal and n 2 is the effective refractive index of the milk.
While the refractive index of such a sample is normal for cow milk the refractive constant will be found to be usually too high for that value of the refractive index. Added skim milk or removal of fat is detected by the lowered values of refractive constant, which in average samples is reduced below the minimum for pure milk at about a minimum of 20–25 per cent. addition.
The refractive index of milk is 1.3440 to 1.3485 and can be used to estimate total solids.
Refractive index of milk and ghee: Refractive index of milk has a range between 1.3440 to 1.3480. The refractive index of water at 20 0 C with the D line of sodium = 1.33299. The refractive index of material such as spectrum (589.3 mm) is n(d) 20 milk is higher than water due to dissolved material in milk.
In the present work, the surrounding medium is air (n ambient = 1) and the refractive index of milk is assumed to be 1.347.
This application note describes the analysis of milk sugars in whole milk and lactose reduced milk using a carbohydrate column and the RI-4 refractive index detector. This requires the separation of three sugars: lactose, glucose, and galactose. The glucose and galactose are produced as a result of the hydrolysis of lactose (2).
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