Is apple cider vinegar a polyphenol?

In recent years, Apple Cider Vinegar (ACV) has risen from a traditional kitchen seasoning to a star product in the global health and wellness industry. From assisting weight management to improving digestion, its potential health benefits are widely spread. Under the keen attention of consumers and brand owners, a core question is often mentioned and even misunderstood: "Is apple cider vinegar a polyphenol?"

To understand the relationship between apple cider vinegar and polyphenols, it is necessary to first clarify the essence of apple cider vinegar.

Apple cider vinegar is a product made from apples or apple juice through two key microbial fermentation stages:

• The first stage is yeast-dominated alcohol fermentation, which converts the sugar in apples into ethanol.
• The second stage is acetic acid fermentation, dominated by Acetobacter, which oxidizes ethanol to acetic acid.

Therefore, in terms of composition, the main functional component of apple cider vinegar is acetic acid, which also contains a small amount of nutrients derived from raw apples, such as amino acids, vitamins, minerals, and the focus of our attention - polyphenols.

The key is that apple cider vinegar itself does not contain polyphenols, but a complex mixture containing polyphenols. The polyphenolic substances in it are completely inherited from its only raw material - apples. This means that the types and contents of polyphenols in apple cider vinegar are fundamentally influenced by the variety, maturity, planting conditions, and even the subsequent fermentation process and aging time of the apples used. This also explains why there are significant differences in polyphenol content among different brands and batches of apple cider vinegar on the market.

Polyphenols are a widely distributed class of secondary metabolites in the plant kingdom, characterized by the presence of multiple phenolic hydroxyl groups in their molecules. In apples, the types of polyphenols are extremely rich, forming the material basis for their color, flavor (such as astringency), and various biological activities.

According to authoritative research, polyphenols in apples can be mainly classified into the following categories:

1. Flavan-3-ols: including catechins, epicatechins, and their polymers - anthocyanins. This is the most abundant component in apple polyphenols, especially anthocyanins, which can account for over 50% of the extract.
2. Flavonols: They mainly exist in the form of glycosides of quercetin, such as quercetin glycosides and isorhamnoside glycosides.
3. Phenolic acids: Hydroxycinnamic acid substances represented by chlorogenic acid.
4. Dihydrochalcones: Polyphenols unique to apples, mainly composed of root bark glycosides and their aglycones.
5. Anthocyanins: mainly found in the skin of red-skinned apples, they are the main pigments that give apples a red color, such as cyanidin-3-galactoside.

The study clearly indicates that the distribution of these polyphenols in apples is not uniform, and the total polyphenol content in apple peel is much higher than that in fruit pulp. The total polyphenol content in the peel of certain apple varieties can reach up to 1158 mg/100g, while the pulp is relatively low. These compounds are widely believed to have multiple health benefits, such as strong antioxidant, anti-inflammatory, cardiovascular protection, and even blood sugar regulation. This is also the highly respected scientific foundation for apples and their derivatives.

Compared to standardized plant extracts produced for specific purposes, apple cider vinegar, as a fermented beverage, typically has lower polyphenol concentrations. In order to obtain sufficient doses of polyphenols, it may be necessary to drink a large amount of apple cider vinegar, but this can also lead to high intake of acetic acid. This highlights the core value of the plant extract industry.

When the functional food, dietary supplement, or cosmetics industry needs to take advantage of the specific health benefits of apple polyphenols, what they seek is not apple cider vinegar, but apple polyphenols - a standardized extract separated and purified from apples through modern extraction techniques. The apple polyphenol extract market is a highly specialized field dominated by a few leading companies in the global plant extract industry.
The main producers in the global apple polyphenol market include international giants such as Naturex from France (now part of Givaudan), Ajinomoto from Japan, and ADM from the United States, as well as leading Chinese companies such as XI'AN APP-CHEM BIO (TECH) CO., Ltd(APPCHEM) and Tianjin Jianfeng Natural Products, which have emerged with the rise of China's plant extract industry.

Reference

[1]DETERMINATION OF APPLE CIDER Vinegar's PHENOLIC COMPOUNDS CONTENT AND ANTIOXIDANT CAPACITY. Ruaa Hussein et al. [2025-02-17]

[2]Phytochemical Content and Antioxidant Activity of Vinegar Prepared from Four Apple Varieties by Different Methods. Mohammed Kara et al. [2021-10-02]

[3]CARPATHIAN JOURNAL OF FOOD SCIENCE AND TECHNOLOGY. Technical University of Cluj-Napoca, U.T.Press Publishing House. [2020]

[4]U. Vrhovšek, A. Rigo et al. "Quantitation of polyphenols in different apple varieties." Journal of agricultural and food chemistry (2004). [2004-09-28]