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  • Some imp definitions from IP 2007

    Acetyl Value : The acetyl value is the number which expresses in milligrams the amount of potassium hydroxide required to neutralise the acetic acid liberated by the hydrolysis of 1 g of the acetylated substance.

     Acetyl value = 1335(b - a)/(1335 – a)

    Where, a = saponification value of the substance;
                b = saponification value of the acetylated substance.

    Acid Value: The acid value is the number which expresses in milligrams the amount of potassium hydroxide necessary to neutralise the free acids present in 1 g of the substance.

    Acid value = 5.61 n/w

    Where, n = the number of ml of 0.1 M potassium hydroxide required;
                w = the weight, in g, of the substance.

    Ester Value: The ester value is the number of milligrams of potassium hydroxide required to saponify the esters present in 1 g of the substance.

    Ester value = Saponification value – Acid value.

     Hydroxyl Value: The hydroxyl value is the number of milligrams of potassium hydroxide required to neutralise the acid combined by acylation in 1 g of the substance.

    Iodine Value: The iodine value is the number which expresses in grams the quantity of halogen, calculated as iodine, which is absorbed by 100 g of the substance under the described conditions. It may be determined by any of the following methods.

    A : Iodine Monochloride Method or Wijs Method
    B : Iodine Monobromide Method or Hanus Method
    C : Pyridine Bromide Method

    Peroxide Value: The peroxide value is the number of milliequivalents of active oxygen that expresses the amount of peroxide contained in 1000 g of the substance.

    Calculate the peroxide value from the expression,

    Peroxide value = 10 (a - b)/w

    Where, w = weight, in g, of the substance.

    Saponification Value: The saponification value is the number of milligrams of potassium hydroxide necessary to neutralise the free acids and to saponify the esters present in 1 g of the substance.

    Saponification value = 28.05 (b - a)/w

    where, w = weight, in g, of the substance.

    Jelly Strength : The jelly strength of Gelatin is the weight, in g, necessary to give a 4 mm depression in a jelly containing 6.67 per cent w/w, matured at 10º, using a plunger 12.7 mm in diameter.

     Loss on Drying : Loss on drying is the loss of weight expressed as percentage w/w resulting from water and volatile matter of any kind that can be driven off under specified conditions. The test is carried out on a well-mixed sample of the substance.

     Loss on Ignition : Loss on ignition is the loss in weight in per cent w/w resulting from a part of any test material, that is volatilised and driven off under specified conditions. The test is performed on finely powdered material; lumps, if any should be broken up with the aid of a mortar and pestle.

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