橙汁中总酸检测方案(食品品质检测)

橙汁饮料中总酸的测定 应用资料果汁酸度的测定引用JAS, ISO 750, GB 12456的标准，其中规定了用氢氧化钠进行电位法酸碱滴定。用0.1mol/L氢氧化钠滴定至pH8.2，滴定体积转化为柠檬酸。含有颗粒状果肉的果汁样品需要过滤。京都電子工業株式会社KYOTO ELECTRONICSMANUFACTURING CO.，LTDTIZ-99223enL1/1京都電子工業株式会社KYOTO ELECTRONICSMANUFACTURING CO.，LTD Application MemoAcidity of Orange Juice Industry Food & beverageInstrument Automatic potentiometric titratorMeasurement method Potentiometric titration /Neutralization titrationStandards JAS、ISO 750， GB 12456 1.Overview Determination of acid degree of fruit juice is standardized by below quoted Japanese Agricultural Standards and ISO 750：1998 where potentiometric acid-base titration withsodium hydroxide is specified. Titrate with 0.1mol/L sodium hydroxide up to pH8.2， and the titration volume is converted tocitric acid. Sample juice with granular pulp requires filtering. 2. Apparatus Main unit Automatic potentiometric titrator (preamplifier STD) Electrode Combination glass electrode Temperature compensation electrode 3. Reagents Titrant 0.lmo1/L sodium hydroxide 4. Example -Measurement results- Sample Titer Acidity (g) (mL) (w/w%) 1 5.000 5.4668 0.6778 2 4.951 5.3966 0.6756 3 4.995 5.4523 0.6766 Average 0.6767 SD 0.0011 RSD(%) 0.16 -Titration curve- Please feel free to contact us for any further information. Kyoto Electronics Manufacturing Co.， Ltd. Overseas Sales & Marketing Sect.