红花籽油中过氧化值的检验 应用资料

红花籽油中过氧化值的检验 应用资料用过氧化物值(POV)来评估脂肪和油或含过氧化物食物的氧化程度。POV以meq/kg(相当于mg/kg)表示，是由环境氧气氧化脂肪和油所形成的过氧化氢的量。在溶剂中溶解样品后，将饱和碘化钾加入到该溶液中，同时通过其冒泡氮气与样品中的过氧化物发生反应。将得到的游离碘用0.01mol/L硫代硫酸钠滴定至终点。过氧化物值由硫代硫酸钠的滴定体积计算得出。TIB-06014enL-K-MKYOTO ELECTRONICSMANUFACTURING CO.，LTD. Application MemoPOV of Safflower Oil IndustryFat and oilInstrumentAutomatic potentiometric titratorMeasurement methodRedox titration， GB 5009.227， GB/T 22465StandardsThe JOCS Standard methods for the Analysis of Fats， Oils and Related Materials 1.Overview The degree of oxidization of fat and oil or food containing them is evaluated by the peroxidevalue (POV). POV is expressed in meq/kg (equivalent mg/kg) and is the amount ofhydroperoxide formed by oxidization of fats and oils by ambient oxygen. After solving thesample in the solvent， saturated potassium iodide is added to this solution while bubblingnitrogen gas through it to react with the peroxide in the sample. The obtained free iodine istitrated with 0.01mol/L sodium thiosulfate up to the endpoint. The peroxide value is calculatedfrom the titration volume of the sodium thiosulfate. OOH OH 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier STD) Electrode Combined Pt electrode for micro titration 3. Reagents Titrant 0.01mol/L sodium thiosulfate Solvent Mixture solution of acetic acid and isooctane (3+2)(vol%) Additive Saturated potassium iodide Inactive gas Nitrogen gas 4. Example —Measurement results- Sample Titer POV (g) (mL) (meq/kg) 1 5.0110 0.8963 1.793 2 5.0143 0.9067 1.812 3 5.0213 0.8998 1.796 Average 1.800 SD 0.011 RSD(%) 0.59 CmL] -Titration curve— Please feel free to contact us for any further information. Kyoto Electronics Manufacturing Co.， Ltd. Overseas Sales & Marketing Sect. 京都电子工业株式会社-可睦电子(上海)商贸有限公司 上海市徐汇区宜山路333号1201室 电话：021-54488867 电邮： kemu-kem@163.com网址： http：// www.kem-china.com