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Figure 3. Correlation between temperature and quantitative ion peak area of raspberry ketone and benzonitrile
The science of discovery Figure 2. Correlation between area value of aroma compounds and oven temperature
As shown in Figure 3, the peak area of raspberry ketone increases with temperature, but the tendency decreases from around 210°C. On the other hand, the peak area of benzonitrile does not change much in the low-temperature range, but the peak area value rapidly increases from 250°C. These results show that the increasing tendencies of the area values of the two compounds are quite different.
The Smart Aroma Database contains sensory information about numerous aroma compounds. According to the sensory information, for example, raspberry ketone smells like raspberry, and benzonitrile smells rancid. From the results shown in Figure 2 and Figure 3, it can be inferred that the raspberry-like scent intensifi es until 210°C, and the rancid smell increases rapidly from around 250°C.
To sum it all up: Investigating the correlation between aroma compounds of e-liquid vapour and heating temperature using a GCMS-QP2020 NX and an HS-20 NX revealed that, by linking changes in aroma compounds with sensory information, a new method was created that can be applied to improve strategic scent design and evaluation. In addition, it was confi rmed that the Smart Aroma Database strongly supports the analysis of e-cigarette aroma compounds, as it includes information on characteristic ions, retention indices and mass spectra for more than 500 aroma compounds. The database also contains sensory information for all of these aroma compounds.
The recommended analytical hardware and software are listed below. The rest of the story ...
As noted, a new method was developed that offers researchers the opportunity for more effi cient design and evaluation of e-cigarette aromas and fl avours by linking the analysis results of aroma compounds with sensory information. But – even more interestingly – it also points the way towards a better way to test e-cigarettes for safety. Investigating the effects of heating on e-liquids for one thing – aromas – can also be used for investigating another thing: unplanned harmful compounds created by the chemical process of heating. But that, as they say, is another story. Perhaps even one for a future issue of the Secrets of Science.
Main unit: Nexis GC-2030 with GCMS-QP2020 NX: gas chromatograph plus mass spectrometer detector
Accessory: HS-20 NX headspace sampler Main consumable: SH-I-5Sil MS
Software: GCMSolution and GCMS Lab Solutions Insight Software
A picture of the instruments used, including the main unit and the accessory, can be seen in Figure 1.
This article highlights an important aspect of scientifi c inquiry. That is, that one thing does truly lead to another. From looking into fl avours to improving consumer safety is not necessarily a linear move. Science hops and jumps and sometimes leads from A to Z while bypassing all of the letters in between. Science leads to discovery, and sometimes we discover things that we didn’t even know were there.
Shimadzu salutes the creativity and dedication of scientifi c researchers everywhere and commits its research to ensuring that laboratories worldwide have the best tools available to follow science –wherever it leads.
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