Replicating Carbonation: The Chemistry Behind “Fizzy” Vape Flavors

Author:R&D Team, CUIGUAI Flavoring

Published by:Guangdong Unique Flavor Co., Ltd.

Last Updated: Jan 24, 2026

Liquid to Vapor Transition

Introduction: The Holy Grail of Beverage Vapes

For the flavor chemist and the e-liquid manufacturer, few challenges are as daunting—or as rewarding—as the replication of “fizz.” When a consumer vapes a “Cola,” “Lemon-Lime Soda,” or “Sparkling Champagne” flavor, their expectation extends beyond the mere taste of sugar and aromatics. They are looking for the tactile, prickly, and refreshing sensation of carbonation.

In traditional beverages, this sensation is provided by dissolved Carbon Dioxide (CO₂) under pressure. When the pressure is released, the CO₂forms bubbles that physically stimulate the tongue and trigger specific neural pathways. However, in the world of electronic nicotine delivery systems (ENDS), we cannot “dissolve” gas into Propylene Glycol (PG) or Vegetable Glycerin (VG) in a way that survives the heating element of an atomizer.

To replicate “fizzy” flavors, we must move away from the physics of gas and toward the complex chemistry ofchemesthesis—the chemical stimulation of the trigeminal nerve. This article provides an exhaustive technical analysis of how we use organic acids, cooling agents, and volatile aromatic esters to trick the human brain into perceiving a sparkling sensation where no gas exists.

1. The Neurobiology of the “Fizz” Sensation

To recreate a sensation, we must first understand how the body perceives it. Carbonation is not just a “feeling”; it is actually a taste. For decades, it was believed that the “fizz” in soda was purely mechanical—the bubbles popping on the tongue. However, recent neurobiological research has proven otherwise.

1.1The Role of Carbonic Anhydrase 4 (CA4)

The sensation of carbonation is primarily mediated by an enzyme calledCarbonic Anhydrase 4 (CA4), which is located on the sour-sensing taste receptor cells of the tongue. When CO₂enters the mouth, CA4 converts it into bicarbonate ions and protons (H⁺). These protons stimulate the sour-sensing cells, sending a specific signal to the brain.

CITATION 1: Research published in the journal Science by the University of California, San Diego, identified that the “fizz” of carbonated drinks is perceived by the same taste cells that detect sourness, specifically through the CA4 enzyme.

Source: “The Taste of Carbonation,” Science/AAAS. Available at: https://www.science.org/doi/10.1126/science.1180012

1.2The Trigeminal Nerve Response

Beyond the taste receptors, “fizz” involves thetrigeminal nerve, which is responsible for detecting temperature, pain, and irritation in the face and mouth. The “prickle” of a soda is a form of mild “chemo-nociception”—a tiny, controlled “pain” signal that the brain interprets as refreshing. In e-liquids, we must find chemicals that can trigger this trigeminal “sting” without causing actual discomfort.

2. The Physics Gap: Why We Can’t Use Real CO₂

In the soft drink industry, CO₂is forced into water at high pressure (often 30-45 psi). In an e-liquid bottle, maintaining such pressure is impossible. Furthermore, even if we could carbonate a PG/VG base, the physics of vaping would defeat the effort:

• Vaporization Temperature:E-liquids are heated to between 180°C and 250°C. At these temperatures, any dissolved gas would be instantly expelled from the liquid long before it reached the user’s mouth.
• Surface Tension:VG has a high viscosity and surface tension compared to water. Bubbles in VG do not “pop” with the same velocity or frequency as they do in water, leading to a “heavy” mouthfeel rather than a “bright” one.

Therefore, the “fizz” in a vape is asensory illusioncreated through three chemical pillars:Acidity, Cooling, and Volatile “Lift.”

Carbon Dioxide Molecule Diagram

3. Pillar I: The Acidic Bite (The “Tingle”)

The most critical component of the “fizz” illusion is the use of organic acids. Because the brain associates the stimulation of sour-sensing cells with carbonation, we use a specific blend of acids to mimic the pH drop that occurs when CO₂dissolves in water.

3.1Malic Acid (C₄H₆O₅)

Malic acid is the primary tool for “fizzy” vapes. It provides a sharp, immediate “tingle” on the edges of the tongue. Unlike other acids, Malic acid has a “lingering” sourness that mimics the way the carbonic acid sensation stays in the mouth after a sip of soda.

3.2Citric Acid (C₆H₈O₇)

Citric acid is used for “brightness.” In beverage profiles like Lemon-Lime or Orange Soda, Citric acid provides the initial “zing.” However, Citric acid can be hard on coils (causing “gunking”), so it is often used in a 10% dilution in PG.

3.3Tartaric Acid (C₄H₆O₆)

For “Grape Soda” or “Champagne” profiles, Tartaric acid is essential. It provides a “dryer” mouthfeel and a heavier “bite” that mimics the tannins and carbonation found in fermented or grape-based beverages.

3.4The Importance of pH Balancing

The target for a “fizzy” e-liquid is usually a pH between3.5 and 4.5. If the pH drops too low, the flavor becomes “harsh” rather than “fizzy.” If it is too high, the flavor tastes “flat.”

4. Pillar II: Cooling Agents (The “Cold Burn”)

A lukewarm soda never tastes as fizzy as a cold one. This is because cold temperatures sensitize the TRPM8 receptors in the mouth, which in turn amplifies the trigeminal nerve’s response to the “fizz.” In vaping, we use “Coolada” or specialized cooling agents to simulate this.

Cooling Agent Curve Comparison

4.1WS-23 (N,2,3-Trimethyl-2-isopropylbutanamide)

WS-23 is the industry standard for “fizzy” vapes because it provides a clean, intense coldness withno minty aftertaste. By cooling the vapor, we create the environmental conditions required for the brain to accept the “fizz” illusion.

4.2WS-3 (N-Ethyl-p-menthane-3-carboxamide)

While WS-23 cools the throat, WS-3 focuses more on thetongue and roof of the mouth. A blend of WS-23 and WS-3 is often used to create a “full-mouth” coldness that mimics the experience of drinking an ice-cold carbonated beverage.

5. Pillar III: Volatile Esters and the “Lift”

When you open a soda, the first thing you experience is an “aromatic burst”—the gas carrying volatile flavor molecules into your nose. To replicate this in a vape, we use high-volatility esters.

5.1Ethyl Acetate

Ethyl Acetate is a common ester used to provide “lift.” It has a slightly fruity, “ethereal” scent and a very low boiling point. When added in minute quantities, it helps the other flavors “pop” the moment the vapor hits the palate, mimicking the way carbonation carries aromatics.

5.2Citral and Limonene

For citrus sodas, the “fizzy” sensation is enhanced by using “top-heavy” citrus notes.Citralprovides a sharp, candy-like lemon bite, whileLimoneneprovides the zesty, sparkling top note of an orange or lime.

5.3The “Champagne” Ester: Ethyl Methylphenylglycidate

In sparkling wine profiles, this ester (often called “Strawberry Aldehyde,” though it is an ester) provides a “fizzy fruit” nuance that, when combined with Tartaric acid, creates a convincing “bubbly” sensation.

6. The “Bicarbonate” Theory: Can We Use Effervescence?

One of the most persistent “hacks” in e-liquid DIY circles is the addition of small amounts ofSodium Bicarbonate(Baking Soda) orPotassium Bicarbonate. The theory is that the heat of the coil will cause the bicarbonate to release CO₂gas directly into the vapor.

6.1The Technical Reality

While thistechnicallyworks on a molecular level, it presents significant manufacturing challenges:

• Solubility:Bicarbonates do not dissolve well in PG/VG. This leads to “fallout,” where the powder settles at the bottom of the bottle.
• Coil Destruction:Mineral salts are non-volatile. When the e-liquid vaporizes, the salt remains on the coil, leading to “crusting” and a burnt taste within hours of use.
• pH Interference:Bicarbonates are alkaline. They neutralize the very acids (Malic/Citric) that we need to create the “fizz” sensation.

As a professional manufacturer, we generally avoid bicarbonates in favor ofEtil maltoleTriacetina, which can modify the “mouthfeel” to be “lighter” and more “aerated” without destroying the hardware.

CITATION 2: The Flavor and Extract Manufacturers Association (FEMA) provides safety data and “GRAS” (Generally Recognized as Safe) lists for flavoring substances. Their research into esters and organic acids forms the basis for the safety profiles of the “fizz” components used in ENDS.

Source: FEMA GRAS Lists. Available at: https://www.femaflavor.org/gras

7. Mouthfeel and the “Sparkle” Effect

A “flat” vape often feels “syrupy” or “heavy” due to the high VG content. To make a flavor feel “fizzy,” we must “lighten” the mouthfeel.

7.1The Role of Triacetin

Triacetin (Glycerin Triacetate) is a solvent and a mouthfeel modifier. It has a “thinning” effect on the perception of the vapor, making it feel less like a heavy cloud and more like a “sharp” mist. This “thinning” is crucial for beverage profiles.

7.2Erythritol: The Secret “Crisp”

While Sucralose is the standard sweetener for vapes, it can feel “heavy” and “sticky.” Many “fizzy” formulations useErythritol. Erythritol has a lower sweetness level but provides a “cooling” sensation as it dissolves (the “heat of solution”). This adds a “crispness” to the finish of the vape that Sucralose cannot match.

Fizzy Flavor Mapping Infographic

8. Case Study: Deconstructing a “Fizzy Cola” Profile

To see these principles in action, let’s look at how we would build a “Fizzy Cola” flavor concentrate from the ground up.

8.1The Base (The “Syrup”)

• Caramel and Vanilla:The core sweetness.
• Cinnamon and Nutmeg (Trace):The “spice” notes that define Cola.
• Phosphoric Acid (Trace):Traditional in sodas, but in vapes, we often substitute with a Malic/Tartaric blend for better coil life.

8.2The “Fizz” Package

• Malic Acid (10% Dilution):Added at 2% of the total volume. This provides the “prickle.”
• WS-23:Added at 1.5%. This provides the “iced” sensation.
• Ethyl Acetate:Added at 0.2%. This provides the “volatile lift” when the bottle is opened and the vapor is inhaled.
• Lemon and Lime Terpenes:Added at 0.5% to provide the “bright” top-end that mimics the carbonic acid “zing.”

8.3The Result

When vaped, the user first feels thecold (WS-23), followed immediately by theacidic tingle (Malic Acid). As they exhale, thevolatile esters (Ethyl Acetate)carry the cola aromatics through the retro-nasal passage, creating a “bubbly” sensory experience that mimics a glass of fresh cola.

9. Challenges in Stability and Coil Longevity

Creating a “fizzy” flavor is one thing; making it shelf-stable is another.

9.1Acid-Flavor Interaction

Over time, high concentrations of Malic or Citric acid can cause “esterification” or “hydrolysis” of other flavor molecules. For example, a “Strawberry Soda” may lose its strawberry “brightness” over six months because the acid is slowly breaking down the strawberry esters.

CITATION 3: A study in the Journal of Agricultural and Food Chemistry notes that the stability of esters in acidic environments is a major concern for shelf-life, as the pH of the solution directly influences the rate of aromatic degradation.

Source: “Stability of Flavor Esters in Acidic Media,” ACS Publications. Available at: https://pubs.acs.org/journal/jafcau

9.2Coil Gunking and Caramelization

Acidic “fizzy” vapes are notorious for shortening coil life. The combination of sweeteners (like Sucralose) and organic acids creates a “syrup” that caramelizes quickly on the heating element. To combat this, we recommend:

• Usinghigh-purity acidswith minimal mineral content.
• Balancing the “fizz” withErythritolrather than pure Sucralose.
• Encouraging users to vape atslightly lower temperaturesto prevent the “scorching” of the acidic components.

10. The Regulatory Landscape of “Fizzy” Additives

As with all flavoring components, safety is paramount. The vaping industry is under intense scrutiny from bodies like theFDAeTPD.

• Diacetyl and Acetyl Propionyl:These must be avoided entirely. “Fizzy” flavors, being mostly beverage-based, are naturally low-risk for these “popcorn lung” chemicals.
• Acidity and Respiratory Health:There is ongoing research into the effect of inhaling acidified aerosols. While the concentrations used in “fizz” packages are very low, we ensure all our acids areUSP/FCC Gradeand tested for inhalation safety.

CITATION 4: The UK Medicines and Healthcare products Regulatory Agency (MHRA) and the Tobacco Products Directive (TPD) in Europe set strict limits on additives. Their guidelines emphasize that flavoring chemicals must not create a risk to human health in their heated form.

Source: “Guidance on E-cigarette notifications,” MHRA. Available at: https://www.gov.uk/guidance/e-cigarettes-regulations-for-consumer-products

11. Future Frontiers: New Molecules for “Fizz”

The quest for the “Perfect Fizz” continues. We are currently exploring several new chemical frontiers:

11.1 Advanced TRPA1 Agonists

While WS-23 targets the “cold” receptors, we are looking at molecules that specifically target theTRPA1(transient receptor potential ankyrin 1) receptors. These are the receptors that respond to the “sting” of mustard or horseradish. In micro-doses, they could provide a “sparkle” that is even more realistic than Malic acid.

11.2Encapsulated Acids

By encapsulating organic acids in a heat-sensitive lipid shell, we could potentially protect the coil from “gunking” while allowing the acid to release only when it reaches the necessary temperature for vaporization.

11.3 “Aerated” Aromatics

We are working on “low-density” flavor molecules that have a higher “vapor pressure,” allowing them to expand more rapidly upon inhalation, creating a “fluffy” or “bubbly” mouthfeel.

Conclusion: The Art of Sensory Deception

The “fizz” in a vape flavor is a testament to the power of modern flavor chemistry. It is a symphony of neurobiology, organic chemistry, and sensory psychology. We don’t need CO₂to create a “sparkle”; we only need to understand the triggers that the human brain uses to identify that sensation.

Through the precise application ofMalic acidfor the “tingle,”WS-23for the “cold,” andvolatile estersfor the “lift,” we can transport a vaper to a refreshing glass of their favorite soda. As we continue to refine our “fizz” packages, we remain committed to the balance of intensity, stability, and—above all—safety.

Fizzy Concentrate Laboratory Testing

Call to Action: Master the Fizz with Us

Are you ready to elevate your beverage flavor line with a truly authentic “fizzy” experience? Our technical team is ready to assist you in formulating the perfect “sparkle” for your brand.

• Technical Exchange:Contact our lead flavor chemists for a deep-dive consultation on acid-to-cooling ratios.
• Free Sample Request:Request a sample of our “Sparkle-X” Fizz Base and our premium “Cola-V” concentrate.