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Determining the drop point of edible oil by Ubbelohde method (CAT#: STEM-PPA-0198-LJX)

Introduction

Edible oils and fats are lipid materials that are generally soluble in organic solvents but insoluble in water. While oils and fats are chemically similar in that both are composed of triglycerides, the distinction between them is that fats are solid at room temperature, while oils remain liquid.
Edible oils and fats including cooking oils are an essential part of everyday life and can be derived from animal, vegetable or even synthetic sources, and their consumption enables the fulfillment of both structural and metabolic functions in the body. They can be ingested directly or as components of prepared foods, to which they may lend flavor or texture. Edible oils and fats may find additional use in the production of soaps and other skin care products, candles, and perfumes. When processing oils and fats, robust quality control is a must.




Principle

A dedicated one tenth of a degree resolution thermometer is directly immersed in contact with the sample residing in a cup. The setup is positioned in a test tube and the heating is performed with a water bath. The drop point temperature should be recorded as soon as the first drop of sample is visually detected. The results of this test are strongly dependent on the operator's experience.

Applications

For drop point determination of non-crystalline materials such as synthetic and natural products

Procedure

1. A dedicated one tenth of a degree resolution thermometer is directly immersed in contact with the sample residing in a cup.
2. The setup is positioned in a test tube and the heating is performed with a water bath.
3. The drop point temperature should be recorded as soon as the first drop of sample is visually detected.

Materials

• Sample Type:
Edible oil

Notes

Manual methods require visual inspection of the dropping point process, which is tedious as the attention of an operator is required for quite a long time to continuously monitor the test process.

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