Yes that’s where the Sour helps IMO, I like fruit mixes and especially citrus types, don’t let the name Sour fool you,
My notes on Sour (TPA) ;
Malic Acid @20% in PG, Harsh throat hit, add sour.
I use Sour in citrus / fruit mixes up to 1% to raise PH level of citrus acid thus resulting in smoother / less harsh vape
“Malic acid is used as an acidulant, an antioxidant flavoring agent, a buffering agent, and a chelating agent. In pharmaceutical formulations, the substance is used as a general-purpose acidulant. The (L)-enantiomer possesses a slight apple flavor, and is used as a flavoring agent to mask bitter tastes and to provide tartness.”
“Malic acid is the primary acid present in apple and the secondary acid present in citrus fruit rather than citric acid. It imparts a smoother fruity flavour than any other acid. Malic acid is a crystalline white solid with a melting point of 100°C. It is water soluble and less hygroscopic as compared to others, so as to provide a good storage shelf-life. It is widely used in low-calorie drinks, e.g. cider (apple wine). It enhances the colour and flavour in carbonated and non-carbonated fruit-flavoured drinks .”
“Malic acid is a dicarboxylic acid with pK values of 3.40 and 5.11. Malic acid has a smooth, tart taste that lingers in the mouth without imparting a burst of flavour. Malic acid is highly water soluble. It is inhibitory to yeasts, moulds and bacteria, probably due to its impact on pH (Doores, 1993). It is used in beverages, hard candies, canned tomatoes and fruit pie fillings.“
“Malic acid is one of the general-purpose additives in the FDA list of GRAS substances. It is commercially synthesized as a racemic mixture of D- and L-isomers from maleic and fumaric acids in the presence of a suitable catalyst. However, it is found in nature as the L-isomer in many fruits and vegetables and is the second most prevalent acid in citrus fruits.
Malic acid has a smooth tart taste resembling that of citric acid, and although its degree of ionization in water is similar to that of citric acid, malic acid has a much stronger apparent acidic taste (25). Another function of malic acid is its synergistic effect with antioxidants to prevent fats and oils from becoming rancid (26).
Hence, the addition of small amounts of malic acid in the production of [e-juice?] will not only extend shelf life but will also give a smooth and tart taste. Most importantly it will act as a flavor potentiator with many of the flavoring materials used.”
“This is a key ingredient that takes your juice from homeade to vape shop quality!”