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  • Drink: Generic cola
  • Objective: To extend carbonation shelf life
  • Date: February 24


  • Current carbonation level at the end of shelf-life is 6.4g/l
  • Can the carbonation level at the end of shelf-life be extended to 5.8g/l by the addition of CO2Sustain  to give a sensory match for fizziness

Sample Preparation

  • Cola was re-carbonated on an Armfield carbonator to 2 carbonation specifications 6.4g/l and 5.8g/l
  • CO2Sustain was dosed at 0.1g/l into the bottles with 5.8g/l of CO2 labelled ‘A’
  •  Samples were filled into glass bottles and refrigerated overnight

Test Methods

  • A sensory panel (8 people) completed a blind taste where the participants were asked whether the CO2Sustain sample ‘A’ was:
    • Less fizzy than sample B (blank)
    • More fizzy than sample B
    • No difference
  • The participants drank directly from the bottle.
  • The bottles were then tested for carbon dioxide loss on pouring
  • The 275ml sample bottle was poured gently into a glass vessel on an analytical balance
  • The weight of CO2 lost was recorded over a 30-minute period

Sensory Results

  • Of the 8 panelists, 5 people recorded the sample with CO2 Sustain® as being fizzier
  • 3 people recorded no difference

Results – Carbon Dioxide Retention on Pouring

Carbon dioxde on pouring
  • The graph shows that the sample with CO2Sustain retained more CO2 when poured
  • At the point of pouring, both samples recorded a carbonation level of 5.2g/l despite having different starting carbonation levels of 6.4g/l and 5.8g/l (with CO2Sustain)
  • The final level of carbon dioxide retained after 30 minutes was 4.3g/l for the sample with CO2Sustain and 4.1g/l for the standard sample


  • Adding CO2Sustain has allowed a sensory match at 0.6g/l lower CO2
  • If the beverage at the end of carbonation shelf-life is losing 01.g/l CO2/week then 0.6g would equate to an extra 6 weeks
  • This also presents the possibility to lightweight the PET bottle

Download the report here.

If you would like us to do a similar report on one of your drinks please get in touch either by emailing or calling us on +44 (0)113 205 0971