The acid value is determined by directly titrating the oil/fat in an alcoholic medium against standard potassium hydroxide/sodium hydroxide solution. 11.3 Analytical Importance: The value is a measure of the amount of fatty acids, which have been liberated by
14.10.1: Foods- Acid Value and the Quality of Fats and Oils
2023年7月18日 · The acid value (AV) is a common parameter in the specification of fats and oils. It is defined as the weight of KOH in mg needed to neutralize the organic acids present in 1g of fat and it is a measure of the free fatty acids (FFA) present in the fat or oil.
Determination of Acid Value : Pharmaguideline
2018年5月25日 · Learn how to determine the Acid Value by titration with potassium hydroxide. The acid value is the number which expresses in milligrams the amount of potassium hydroxide necessary to neutralize the free acids present in 1 g of the substance.
Determination of Acid Value - Pharmaguideline
2024年4月16日 · The acid value is based on the quantity of potassium hydroxide required to neutralize one gram of free acid in one gram of fats, oils, or similar substances. Additionally, sodium hydroxide may be required. Three methods are available - Acid value determination; Standardization of sodium hydroxide titrant; Reagent; Titration of test solution ...
Acid Value - an overview | ScienceDirect Topics
EN 14104 is also a titration, however, it uses a dilute ethanolic KOH solution with phenolphthalein as indicator. Other literature related to the acid value includes titration methods for determining the neutralization number (NN) of biodiesel (Komers et al., 1997).
Determination of the FFA in Oils and fats is done by potentiometric titration in Ethanol / Diethyl ether as solvent with KOH in Isopropyl alcohol. The result is calculated as mg(KOH) / g or as %fatty acid (mainly as %oleic acid with Moleic acid = 282,47 g/mol).
酸價 - 维基百科，自由的百科全书
在 化学 中， 酸價 （英語： Acid value），或稱 酸值 、 中和值 、 酸度，表示中和1克 化学物质 所需的 氢氧化钾 （KOH）的 毫克 数 [1] 。 酸值是对 化合物 （例如 脂肪酸）或 混合物 中游離 羧酸 基团数量的一个计量标准。 典型的测量程序是，将一份份量已知的样品溶于有机溶剂，用 浓度 已知的氢氧化钾溶液 滴定，并以 酚酞 溶液作为颜色指示剂。 酸值可做為油脂變質程度的指標 [2]。 當油脂 酸敗， 三酸甘油脂 會分解生成 脂肪酸 及 甘油，造成酸值的上昇。 因此酸值常 …
Acid value - Wikipedia
In chemistry, acid value (AV, acid number, neutralization number or acidity) is a number used to quantify the acidity of a given chemical substance.
Titrate with 0.1N alcoholic KOH until permanent faint pink appears and persists for > 10 s. Acid value = mL alcoholic KOH solution x normality alcoholic KOH solution x 56.1 /g sample. Difference between duplicate determinations should be < 0.1 mg KOH/g fat. 2. Iodine value (AOAC, 1999) Potassium (KI) solution. –15 %. Dissolve 15 g KI in 100 mL H2O.
15.14: Neutralization Reactions and Titration Curves
2024年11月4日 · In an acid–base titration, a buret is used to deliver measured volumes of an acid or a base solution of known concentration (the titrant) to a flask that contains a solution of a base or an acid, respectively, of unknown concentration (the unknown). If the concentration of the titrant is known, then the concentration of the unknown can be determined.