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Sebaceous Gland Secretion Analysis – Sebum Diagnostics

Sebaceous gland secretion analysis examines the composition and quantity of skin sebum. It provides key diagnostic insights into conditions such as acne and seborrhoeic dermatitis.

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Things worth knowing about "Sebaceous Gland Secretion Analysis"

Sebaceous gland secretion analysis examines the composition and quantity of skin sebum. It provides key diagnostic insights into conditions such as acne and seborrhoeic dermatitis.

What is Sebaceous Gland Secretion Analysis?

Sebaceous gland secretion analysis is a diagnostic procedure that examines the secretion produced by the sebaceous glands of the skin, commonly known as sebum. Sebaceous glands are small glands embedded in the skin that produce an oily secretion responsible for protecting and moisturising the skin surface. Analysing this secretion provides information about the composition, quantity, and potential alterations of sebum that may be associated with various skin conditions.

Functions of Sebaceous Gland Secretion

Sebum produced by the sebaceous glands serves several important functions for skin health:

Preventing the skin from drying out
Forming an antimicrobial protective film on the skin surface
Regulating the skin environment (pH balance)
Supporting the skin barrier function

The composition of sebum primarily includes triglycerides, wax esters, squalene, free fatty acids, and small amounts of cholesterol and its esters. Changes in this composition can indicate underlying conditions or hormonal imbalances.

When is Sebaceous Gland Secretion Analysis Used?

The analysis of sebaceous secretion is applied in various clinical and cosmetic contexts, including:

Acne vulgaris: Increased sebum production and altered sebum composition are considered central factors in the development of acne.
Seborrhoeic dermatitis: Excessive sebum production combined with colonisation by the yeast Malassezia can lead to scaling and inflammation.
Rosacea: Changes in the lipid profile of sebum have been observed in patients with rosacea.
Hormonal disorders: Elevated androgen levels (male sex hormones) can increase sebum production and are indirectly reflected in the analysis.
Cosmetic dermatology: For the development and evaluation of skincare products and medical cosmetics.

How is the Analysis Performed?

Several methods are available for sebaceous gland secretion analysis:

Sebummetry

Sebummetry is a non-invasive measurement method in which special film materials or devices (known as sebameters) are applied to the skin. The absorbed sebum alters the light transmittance of the film, which can be measured and quantified. This method is primarily used to determine the amount of sebum produced.

Lipid Extraction and Chromatographic Analysis

For a detailed analysis of sebum composition, the secretion is collected using solvent extraction and subsequently examined by gas chromatography or mass spectrometry. These techniques allow for precise determination of individual lipid classes and fractions.

Tape-Stripping Method

In the tape-stripping method, adhesive strips are applied to the skin and then removed to collect skin cells and sebum. The obtained samples can then be subjected to biochemical and microbiological analysis.

Clinical Significance

Sebaceous gland secretion analysis provides valuable information for dermatologists and researchers. Elevated levels of certain fatty acids or oxidation products in sebum (e.g. oxidised squalene) have been linked to the development of acne. Additionally, inflammatory markers in sebum can indicate inflammatory skin conditions. In research, the analysis is used to evaluate the efficacy of medications such as retinoids or antiandrogens on sebum production.

References

Zouboulis CC et al. - Pathogenesis and treatment of acne and seborrhoeic dermatitis. In: Journal of the European Academy of Dermatology and Venereology, 2014.
Picardo M et al. - Sebaceous gland lipids. In: Dermato-Endocrinology, 2009; 1(2): 68-71.
Fluhr JW, Darlenski R - Sebum. In: Berardesca E et al. (eds.): Non-Invasive Diagnostic Techniques in Clinical Dermatology. Springer, Berlin, 2014.

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