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Christina Wedin
Coordinator
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Analysis of colophony in products with skin contact
Colophony, also referred to as rosin, is a term used to describe a collection of resin acids that are naturally present in the extractives of pine, spruce, and larch trees. Given that pine oil is a common byproduct of the wood distillation process, colophony is often found in significant quantities in pine oil.
Purpose
It is acknowledged that traces of colophony may be present in pulp and, consequently, may be found in various products. However, it is generally accepted that this does not usually cause any problems. However, a Danish study of 2,000 eczema patients found that 3.7% had an allergy from skin contact with colophony. The greatest risk of exposure to these substances is associated with prolonged contact, typically occurring in cases of adhesives utilised in plasters, bandages, cosmetic products, and sanitary items. This allergy has the potential to persist throughout a person's lifetime.
In the context of regulatory frameworks pertaining to hygiene and cosmetic products, there has been an observed increase in the demand for analysis in order to ascertain colophony levels. At RISE, we specialise in the measurement of colophony content, with the objective of ensuring compliance with safety standards and minimising the risk of allergic reactions.
Colophony is a naturally occurring substance that is found in a variety of products, including cosmetics, adhesives, paints, soaps, and industrial chemicals. It is sometimes referred to by different names, such as rosin, resin oil, and tall oil resin. It is imperative to be cognizant of these synonyms to ensure precise identification and analysis.
Methods
The analysis of colophony levels in mass is achieved through the utilisation of gas chromatography for the purpose of examining resin acids. In certain instances, three particular resin acids – abietic acid, dehydroabietic acid, and 7-oxodehydroabietic acid – are employed as markers for colophony. In order to conduct this analysis, a minimum of 20 grams of mass is required.
Delivery
RISE is responsible for the production of a report, the content of which is presented in Excel format, together with relevant images and diagrams. The data has been compiled in accordance with recognised methods, incorporating a measurement uncertainty assessment to ensure the reliability of the results. The report encompasses all pertinent parameters, accompanied by comprehensive comments and elucidations to facilitate enhanced comprehension.
