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Both are poly unsaturated fatty acids(PUFA),each with three(3) double bonds;
Alpha has its 3 double bonds at carbon-9,12 and 15,so starting from carboxyl end(delta),it has its first double bond at C-9.Whenever drawing the alpha linolenic structure from carboxyl end,the first double bond falls on ODD carbon number,hence the name,alpha.It is called omega 3(C-3 from methyl or N side) OR by deducting last double bond, that is,carbon 15 from the total number of carbon in linolenic acid,18.Ditto for Beta linolenic acid.
Beta linolenic has its own 3 double bonds at Carbon-6,9 and 12.So when drawing its structures from carboxyl end it falls on EVEN Carbon number.Hence the name,beta.It is called omega 6 following the same procedures above.thanks
Answer provided by Ademiju Adediti (ademiju_adediti@Yahoo.com)
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