How is the sweet and sour feeling formed in flavored vape?

The “sweet, cool, and sour” sensation of vaping is a complex sensory experience. Its mechanism profoundly affects the attractiveness of the product

The fruit flavor of vapes is mainly due to the addition of food grade essence. These essence are similar to those used in food and drinks. After atomization and heating, they will produce various fruit flavors.

1. Food grade essence: The flavor in e-liquid mainly comes from synthetic food grade essence, such as strawberry, mango, mint, etc. These essence are widely used in the food industry with high safety standards. But for the long-term effects of inhalation into the lungs, that still need more research.
2. Atomization working principle: Vape generates aerosols by heating the e-liquid (mainly containing propylene glycol, vegetable glycerin, essence and nicotine). And essence forms special flavor after heated and volatilized.

A. Sweetness production: receptor activation of non nutritive sweeteners

The normal sweet taste transmission pathway is: a. Detection and conversion (on the tongue) of sweet substances (such as sugar) dissolved in saliva, and binding to “receptors” on the taste buds that specifically detect sweetness. This combination triggers the generation of electrical signals inside taste bud cells. The electrical signals (action potentials) generated by the signal upload (through nerves) are immediately captured by the taste nerves (mainly facial nerves and glossopharyngeal nerves) connected to it, and quickly transmit the “sweet” signal to the brain like electrical wires. c. Recognition and perception (in the brain) signals first reach the brainstem for preliminary processing, and then upload to the taste cortex and emotion/reward center of the brain. Here, the brain ultimately recognizes this as a “sweet” taste and may generate a pleasurable sensation. The perception of sweetness is mainly mediated by the G protein coupled receptor heterodimer T1R2/T1R3 on type II taste buds in the tongue. The high-strength synthetic sweeteners added to electronic cigarette liquids, such as sucralose and neotame, are their key ligands. After binding to the extracellular domain of the receptor, these molecules activate the intracellular G protein (taste transducer protein), which in turn initiates the phospholipase C – β 2 (PLC – β 2) signaling cascade reaction, ultimately leading to the opening of the transient receptor potential M5 (TRPM5) channel, depolarization of the cell, and release of ATP, activating the taste afferent nerves (facial nerve and glossopharyngeal nerve). Sweetener is not sugar, but it can directly act on receptors to generate neural signals, which are interpreted by the brain as sweetness.

B. Generation of coolness: modulation of temperature sensitive ion channels by cooling agents

The core mechanism of coolness is the pharmacological activation of transient receptor potential M8 (TRPM8) ion channels by cooling agents (such as menthol, WS-3, WS-23). TRPM8 is the primary cold sensing sensor, typically physically activated at temperatures below approximately 26 ℃. The above chemical ligands can serve as allosteric modulators, directly binding to specific sites of channel proteins (such as menthol binding to the S4 transmembrane region), significantly reducing their voltage dependence and temperature activation threshold, allowing them to remain open even at normal body temperature (37 ℃). The opening of the channel leads to the influx of Ca ² ⁺ and Na ⁺, causing depolarization of TRPM8 expressing trigeminal sensory terminals and generating action potentials. This signal is transmitted through the trigeminal nerve and unconditionally interpreted by the central nervous system as a “cold” sensation. In the use of electronic cigarettes, this strong cool sensation input can effectively inhibit the harmful signal transduction of stimulating chemicals (such as free base nicotine and propylene glycol) by the trigeminal nerve in the same area, that is, through sensory gating to achieve local anesthesia and reduce throat irritation.

C. Dual effects of acidity: proton sensing and pH regulation

Sensory sourness: Mediated by hydrogen ions (H ⁺) or organic acid molecules (such as citric acid) in aerosols. H ⁺ can enter the cell through the specialized proton channel OTOP1 on taste bud type III cells, or cause cell depolarization by blocking other potassium channels, activating the sour taste neural pathway. Meanwhile, H ⁺ can also directly stimulate the trigeminal nerve endings, producing sharp chemical sensations. Nicotine bioavailability regulation: Currently, most e-liquids are nicotine salt products, which adjust the pH value of the atomized liquid by adding organic acids such as benzoic acid and lactic acid. In low pH (acidic) environments, free base nicotine combines with H ⁺ to form nicotine salts. This form has the following key characteristics: reduced volatility: reduces losses during transmission. Significant reduction in throat irritation: less irritation to the throat mucosa. The absorption efficiency of the lungs is significantly improved: it is more soluble in the surface fluid of the alveoli and passes through the cell membrane. Its pharmacokinetics show that the blood nicotine concentration rises faster and the peak is higher, simulating the nicotine shock of traditional cigarettes.

The above is the principle and usage effect of fruit flavored vape. We are an vape factory. If you need more knowledge about vapes, you can contact us.
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