Sensitivity to alpha-amylcinnamic aldehyde and alpha-amylcinnamic alcohol

Area of Science:

• Dermatology
• Allergology
• Contact Dermatitis

Background:

• Allergy to alpha-amylcinnamic alcohol (alpha-AcAlc) is recognized, but sensitivity to alpha-amylcinnamic aldehyde (alpha-AcAld) is less common.
• Alpha-AcAld is not listed as an ingredient but has been detected in products like Mycolog cream.
• Co-occurrence of allergies to alpha-AcAld and alpha-AcAlc is frequently observed, often linked to perfume ingredients.

Purpose of the Study:

• To investigate the prevalence and clinical significance of alpha-AcAld sensitivity.
• To determine the relationship between alpha-AcAld and alpha-AcAlc allergies.
• To explore the role of alpha-AcAld in chronic eczema, particularly vulvar eczema.

Main Methods:

• Gas-liquid chromatographic analysis to detect alpha-AcAld.
• Patch testing on individuals with suspected sensitivities to alpha-AcAld or alpha-AcAlc.
• Clinical observation and re-exposure studies to assess allergic reactions.

Main Results:

• Ten out of fourteen individuals sensitive to either alpha-AcAld or alpha-AcAlc reacted to both chemicals.
• Four individuals (one male, three females) showed marked sensitivity.
• Three women with marked sensitivity had chronic recalcitrant vulvar eczema, which improved upon avoidance of the suspected sensitizer.

Conclusions:

• Alpha-amylcinnamic aldehyde (alpha-AcAld) is a relevant contact allergen, often co-existing with alpha-amylcinnamic alcohol (alpha-AcAlc) allergy.
• The presence of alpha-AcAld in products warrants attention, especially in cases of chronic eczema.
• Factors such as high absorption areas and concurrent exposure to other sensitizers may contribute to the development of alpha-AcAld allergy.