Autoxidation of Commercial Edible Oils and Emulsified Liquid Type Dressing by the Simple Method for the Determination of Peroxide Value

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1 368 Nippon Shokuhin Kagaku Kogaku Kaishi Vol. /., No.2, (,**1) 6 Autoxidation of Commercial Edible Oils and Emulsified Liquid Type Dressing by the Simple Method for the Determination of Peroxide Value Kazuaki Ichikawa, Nana Fujita, Hiroko Watanabe and Shizuka Hasegawa Department of Health and Nutrition, School of Health and Human Life, Nagoya Bunri University, -0/ Maeda, Inazawa, Inazawa, Aichi.3,2/,* The modified ferric thiocyanate method (PV* method) previously reported by the authors was evaluated for use in the determination of peroxide values (PV) of commercial edible oils in order to ascertain and improve the speed and precision of the PV* method. The PV* method has been confirmed as a simple and rapid determination of PV for very small amounts of sample (*.*+*.+/ g oil), compared with the PV method (JOCS acetic acid-isooctane method, sampling weight *.//.* g oil). The PV* measurements are capable of nearly the same precision as PV measurements. This novel method was applied to evaluate oxidative stability in the autoxidation of several commercial edible oils and emulsified liquid type dressings. The results showed that the oxidative stability of oils increased in the following order : tuna fish oilperilla oil rice bran oilmiddle chain fatty acid type oilsoybean oilcorn oilroasted sesame oildiacylglycerol oil. (Received Feb. +0,,**1 ; Accepted May -*,,**1) Keywords : peroxide value, simple method, oxidative stability, edible oil, emulsified liquid type dressing : PV + + /* ml *.// g PV PV*,. PV,-.3,2/,* -0/ Corresponding author ichikawa@nagoya-bunri.ac.jp to

2 7 : PV +4,,42,4* , PV* * * a +,3 +,1 +* *, ,42,34* /24+, *4*, *.+4/.,4/ +04-,/4. /24.,.4/, ,,4/ / /4* -24. /040 b 2 : * * *4+ +* : *.4* *4+ +. : * * *4+ +0 : * +,4* +*43 +24* 24, +*4, +14* : + *4, *4+ 04, *4+ +2 : * , /42-41,4* : + n-3,/4.,34*.-4,, ,+4, / :, n-0 /+4+ / : - n /.43 * ,* :. n-0,4-142,* : / n-- +*4,,, : 0 n ** g Toc c +** g ++. mg 3+ mg go E.** mg C -+ mg./ mg E E E C C d e * * , *, a,**- +.,**- b GLC c +323 d e PV* PV* + -* +** ml /* g,*,/ PV* + PV* - / GC FID GC-+.B DB-,-

3 370 /. 2,**1 2 8 *.,/ mm-* m, *.,/ m, J & W C-R2A 2* + + +*,**,**.* He, ml/min Make up N, -* ml/min +* : + DET,.* INJ,.*, PV + PV* *.*+ *.+* g *.*/ g + 0 :. +* ml PV S *.+* g -* NH.SCN *.+ ml.+* / nmol PVSmg+*** neq *.*, moll FeCl, -./ *.+ ml,+* - nmol +*-* min /** nm A As S g A-As PV* PV* - - PV1., , PV... PV..- S g +* ml U-,*** /** nm PV PV*..+/ AAs*.+0+*S eq+ PV0.+ U-,2** PV* PV*.../ AAs*.*3+*S eq, PV* PV PV 1* to *.*+*.*, ml + 0 :. +* + *.+ ml 1* to *.*+,, eqml 1* to + 0 :. + *** + *.*1 BuOOH + 0 :. +* ml *.*1 BuOOH *,*.* 0* 2* L BuOOH *, , 31.1 neqml -* NH.SCN *.+ ml *.*, moll FeCl, -./ *.+ ml +*-* min /** nm A As PV*.../ AAs*.*/+*S eq- eq+ eq, eq- PV* eq+eq- PV* eq+. + PV* PV*, - /** nm + *** neq+* ml - - PV* 0 :. /** nm 0 PV 1.2 PV* PV n+*, PV PV+.1 PV* PV n+* 0*

4 9 : 371, PV* No4 PV PV* eq+ PV* eq, PV* eq- PV min // min // min // min PV 142 / g *4*/ g *4*/ g *4*/ g n+* * +4, +4- *4- *4. / g *4*/ g *4*/ g *4*/ g n+* / 24, 24- *41 +*/ min // min // min // min eq+ PV*.4+/AAs*4+0+*S eq, PV*.4./AAs*4*3+*S eq- PV*.4./AAs*4*/+*S + PV* +, PV+.1 PV1./ / +*,* -*.* /* 0* min PV 1./ 1./ *.+ PV , *.+ /*, 1 PV + PV PV PV* + +* PV* +* PV* PV*

5 372 /. 2,**1 2 10, PV*, PV;, PV*;, PV* ;, PV;, PV*;, PV* PV* PV 2,/.. mm +/,./ PV PV PV PV* PV* - PV*, PV*. PV PV* PV. PV* PV PV* PV, PV PV* g PV *.*+ g *.+* g /* mg *.// g /* + PV *+** meq kg *+ *** neq +* ml /* ml / +. PV* PV PV /* / -* +* PV* PV* PV +, + PV

6 11 : 373 /-,**0. 2.,2-* +,. /., ,,* +-++-/ +33/ -./ -//-/ ,.3 3./3/*,*** /,... +., p. +* ,**- 2 + pp. +/*+/+,**/ +3, / -*