Food Tests Milk Test Etc
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Adulterant Simple Method for detection of Common Adulterants Oils and Fats Argemone oil Take some quantity of oil in a test tube. Add equal quantity of concentrated Nitric acid and shake carefully. Milk Water Milk Starch Milk Urea Milk Vanaspati Milk Formalin Milk Synthetic milk Milk Milk Coal Tar Dyes Name of Food Article Red to reddish brown color in lower (acid) layer would indicate the presence of Argemone oil The presence of water can be by putting a drop of milk on a polished slanting surface. The drop of pure milk either or flows lowly leaving a white trail behind it, whereas milk adulterated water will flow immediately without leaving a mark. Add a few drops of tincture of Iodine or Iodine solution. Formation of blue colour indicates the presence of starch. Take a teaspoon of milk in a test tube. Add ½ teaspoon of soybean or arhar powder. Mix up the contents thoroughly by shaking the test tube. After 5 minutes, dip a red litmus paper in it. Remove the paper after ½ a minute. A change in colour from red to blue indicates the presence of urea in the milk. Take 3 ml of milk in a test tube. Add 10 drops of hydrochloric acid. Mix up one teaspoonful of sugar. After 5 minutes, examine the mixture. The red colouration indicates the presence of vanaspati in the milk. Take 10 ml of milk in a tests tube and add 5 ml of con sulphuric acid from the sides of the wall without shaking. If a violet or blue ring appears at the intersection of two layers then it shows presence of formalin. Synthetic milk has a bitter after taste, gives a soapy feeling on rubbing between the fingers and turns yellowish on heating Synthetic milk - test for protein The milk can easily be tested by Urease strips (available in the Medical stores) because Synthetic milk is devoid of protein. Test for Glucose/inverted sugar Milk does not contain glucose /invert sugar, if test for glucose with urease strip found positive. It means milk is adulterated. Ghee, cottage cheese, condensed milk, Add 5 ml of dil. H2SO4 or conc. HCL to one teaspoon full of melted sample in a test tube. Shake well. Pink colour (in case of H2SO4) or crimson
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Transcript of Food Tests Milk Test Etc
AdulterantOils and Fats Argemone oilMilk WaterMilk StarchMilk UreaMilk VanaspatiMilk FormalinMilk Synthetic milkMilkMilkCoal Tar DyesName of Food ArticleSynthetic milk -test for proteinTest for l!cose"in#erted s!garhee$ cottage cheese$ condensed milk$ khoa$ milk po%der etc$Coal Tar DyesS%eet C!rd Vanaspati&a'di (lotting paperStarchChhana or )aneer Starchheehee(!tter*di'le oil )rohi'ited colo!rCocon!t oil Any other oilWhole spices(lack pepper )apaya seedshee$ cottage cheese$ condensed milk$ khoa$ milk po%der etc$+hoa and its prod!ctsVanaspathy or MargarineMashed )otatoes$ S%eet )otatoes and other starches,Vanaspati or MargarineDirt$ d!st$ stra%$ insect$ damaged seeds$ other seeds$ rodent hair and e-crete(lack pepper )apaya seeds(lack pepper .ight 'lack pepper(lack pepperClo#esM!stard seed Argemone seed)o%dered spices Added starchT!rmeric po%der Colo!red sa% d!stT!rmeric po%derChillies po%derChillies po%der Arti/cial colo!rsChillies po%derAsafoetida 01ing2Coated %ith mineral oilVolatile oil e-tracted 0e-ha!sted clo#es2Chalk po%der or yello% soap stone po%der(rick po%der$ salt po%der or talc$ po%derWater sol!'le coal tar colo!rSoap stone or other earthy materialAsafoetida 01ing2Asafoetida 01ing2 StarchAsafoetida 01ing2 Foreign resinSpicesCinnamon Cassia 'arkC!min seedsMalachite greenreen peas Arti/cially colo!redSa3ronSoap stone or other earthy material)o%dered 'ran and sa% d!strass seeds colo!red %ith charcoal d!streen chilli and green #egeta'les,Dried tendrils of mai4eco'Simple Method for detection of Common Adulterants RemarksTake some 5!antity of oil in a test t!'e,Add e5!al 5!antity of concentrated 6itric acid and shake caref!lly,&ed to reddish 'ro%n color in lo%er 0acid2 layer %o!ld indicate the presence of Argemone oilThe presence of %ater can 'e 'y p!tting a drop of milk on a polished slanting s!rface, The drop of p!re milk either or 7o%s lo%ly lea#ing a %hite trail 'ehind it$ %hereas milk ad!lterated %ater %ill 7o% immediately %itho!t lea#ing a mark,Add a fe% drops of tinct!re of 8odine or 8odine sol!tion, Formation of 'l!e colo!r indicates the presence of starch,8odine sol!tion is easily a#aila'le in the medical stores,Take a teaspoon of milk in a test t!'e, Add 9 teaspoon of soy'ean or arhar po%der, Mi- !p the contents thoro!ghly 'y shaking the test t!'e, After : min!tes$ dip a red litm!s paper in it, &emo#e the paper after 9 a min!te, A change in colo!r from red to 'l!e indicates the presence of !rea in the milk,Take ; ml of milk in a test t!'e, Add := ml 'eaker add %ater to it and mi- %ell, .et it stand for half an ho!r, Clear separation of colo!r in %ater indicates ad!lteration,en!ine sa3ron %ill not 'reak easily like arti/cial, Arti/cial sa3ron is prepared 'y soaking mai4e co' in s!gar and colo!ring it %ith coal tar colo!r, The colo!r dissol#es in %ater if arti/cially colo!red, A 'it of p!re sa3ron %hen allo%ed to dissol#ed in %ater %ill contin!e to gi#e its sa3ron colo!r so long as it lasts,
