Q. Vegemite Chocolate, How Does it Smell?

A. It can’t, it doesn’t have a nose.

 

When I die and the internet writes my epitaph, it will say “here lies Renée, she did some chemistry on the smell of Vegemite”.

As such, I felt that when Cadbury released Vegemite Dairy Milk chocolate to the market, it was my solemn duty to once again do some chemistry on the smell of Vegemite. I decided to repeat the aroma analysis experiment on the Vegemite filling from the chocolate and compare with the results from the original Vegemite analysis. The product description states that the filling is caramel mixed with Vegemite so I thought it would be interesting to see if the aroma compounds that were prominent in the Vegemite analysis are present in the chocolate filling, and if any new compounds might be identified from the caramel component.

Presentation1

I used the same extraction and analysis procedure as the previous experiment, so I could directly compare the chromatograms. The results of the two analyses are below, with the original Vegemite in red below and the Vegemite chocolate filling in blue above.

 

Graph3

 

It’s clear to see that there are some key compounds present in both the Vegemite and Vegemite chocolate samples. The three major peaks are common to both samples. These are the ethyl esters of octanoic and decanoic acids, and trans ethyl-4-decenoate. Many of the other smaller peaks are also present in both Vegemites. However, not unexpectedly, there are a couple of compounds present in the Vegemite chocolate filling which are not found in the original Vegemite sample. Notably, tetramethyl pyrazine with the odour descriptors nutty, musty, vanilla, cocoa and maltol which is sweet, caramellic, cotton candy, fruity, bready, and phenyl acetaldehyde with honey, floral rose, chocolate aromas.

Some of the interesting peaks from the original Vegemite analysis (sulfurol, niacinamide, caryophyllene etc.) were absent in the chocolate sample, although I am leaning towards attributing this to dilution effects from mixing with the caramel and an unoptimised analytical method rather than them being somehow ‘removed’ from the product.

To conclude, although I am a fan of both Vegemite and chocolate, I had no qualms in sacrificing a few squares from the block in the name of science. Would not buy again, 1 star.

 

 



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