Ginger Rogers? No, Ginger Ale and its invisible proteome

Area of Science:

• Food science
• Proteomics
• Analytical chemistry

Background:

• Ginger drinks are popular beverages, often marketed with ginger root extract as a key ingredient.
• Accurate labeling of beverage ingredients is crucial for consumer information and regulatory compliance.

Purpose of the Study:

• To investigate the proteomic profile of a ginger drink to verify the presence of ginger root proteins.
• To compare proteomic findings with organoleptic assessments and stated ingredients.

Main Methods:

• Proteomics analysis using combinatorial peptide ligand libraries (ProteoMiner) to capture trace proteins.
• Organoleptic tasting to assess the sensory characteristics, specifically the ginger flavor profile.

Main Results:

• Five grape proteins and one apple protein were identified, consistent with the declared addition of grape and apple juice.
• No ginger root proteins were detected using proteomics, despite the product being marketed as containing ginger root extract.
• Organoleptic tasting confirmed the presence of ginger extract, indicated by its characteristic taste.

Conclusions:

• The absence of detectable ginger proteins via proteomics challenges the claim of ginger root extract as a primary component.
• Ginger extract appears to be a minor component compared to grape and apple juices in the analyzed beverage.
• There is a need for mandatory, precise ingredient labeling in beverages to accurately reflect component quantities.