THE ADUL­TER­ATION CHECK­LIST

Consumer Voice - - Comparative Test -

Vis­i­bil­ity: The oil sam­ples were sub­jected to phys­i­cal test­ing and vis­ual ex­am­i­na­tion. Odour: All the oils were sub­jected to odour and flavour tests for any off-odour/flavour. Sus­pended par­ti­cles: This test is for de­tec­tion of any for­eign mat­ter or im­pu­rity that may have en­tered the prod­uct dur­ing pro­cess­ing. For­eign mat­ter in oil re­duces its ac­cept­abil­ity and may also re­sult in bad odour, and can even be harm­ful to con­sumers. Re­frac­tive in­dex: Re­frac­tive in­dex is the ra­tio of the ve­loc­ity of light in vac­uum to the ve­loc­ity of

light in the oil or fat. The oil should be clear and with­out any hazi­ness. Acid value or free fatty acids: Acid value in­di­cates the pro­por­tion of free fatty acids present in oil or fat. A high acid value in­di­cates stale oil or fat stored un­der im­proper con­di­tions. Re­fined oil acid value for most oil sam­ples lies within 0.5. If any titrat­able acid other than a fatty acid is present in the oil sam­ple, it will be an er­ror. Saponi­fi­ca­tion value: It helps to de­tect the pres­ence of other oils/fats. Un­saponifi­able mat­ter: Un­saponifi­able mat­ter in­cludes sub­stances fre­quently found dis­solved in fatty acids and dry­ing oils which can­not be saponi­fied by caus­tic treat­ment, but which are sol­u­ble in the nor­mal fat sol­vents. Un­saponifi­able mat­ter con­sists of oil-sol­u­ble vi­ta­mins, hy­dro­car­bons, higher al­co­hols and sterols that are not sol­u­ble in wa­ter after es­ter­i­fi­ca­tion. Io­dine value: The io­dine value is a mea­sure of the un­sat­u­rated fats. It is ex­pressed in terms of the num­ber of centi­grams of io­dine ab­sorbed per gram of sam­ple ( io­dine ab­sorbed). A higher io­dine value in­di­cates a higher de­gree of un­sat­u­ra­tion. Arge­mone oil: Arge­mone oil should be ab­sent in ed­i­ble oil.

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