應用方法

Refractive Index of Edible Oils and Fats | AOAC 921.08

應用方法

Fast and Accurate Measurement of the Butyro and Refractive Index Value with a Refractometer

Refractive index of Edible Oils and Fats
Refractive index of Edible Oils and Fats

Refractive Index of Edible Oils and Fats, why and how to measure it?

Fats and oils are macronutrients that have a very varied composition. For the raw materials industry, it is important to know the origin and concentration of its main elements. For example, oil refineries depend on many oils and fats whose origin is different and unknown. Therefore, it is necessary to find out the identity of the product, and for this, the refractive indexes or butyro values are used.

The fastest and most accurate technique to measure it, is by using a digital butyro refractometer with automatic temperature control such as the Excellence Refractometers. Less than 2mL of sample is required and the result is delivered in a couple of seconds

What is the index of refraction of the oil?

Each oil has a specific refractive index measured at a certain temperature, so we can differentiate them. Some of the refractive indices of important oils are described at below 20ºC.

  • Peanut Oil: 1.460 - 1.465
  • Maize Oil: 1.465 - 1.468
  • Mustard Oil: 1.461 - 1.469
  • Sesame Oil: 1.465 - 1.469
  • Soybean Oil: 1.466 - 1.470
  • Sunflower Oil: 1.461 - 1.468
  • Palm Oil: 1.458 - 1.460 (at 40 °C)

Source: Codex Alimentarius: Fats, Oils and Related Products - FAO, Rome (1993)

Download our application to learn how easy measuring the refractive index of oils and fats is using a METTLER TOLEDO refractometer.