Vegan Fining Methods (Pea Protein, Potato Protein — Growing Category)

Vegan fining agents are isolated plant proteins extracted from pea (Pisum sativum) and potato (Solanum tuberosum) and processed into concentrated preparations that bind suspended wine colloids. Unlike egg white (ovalbumin) or isinglass (fish swim bladder collagen), these proteins are entirely plant-derived throughout extraction and purification. The active protein in potato-based fining agents is patatin, a family of glycoproteins recovered from the aqueous by-product of potato processing. Commercial product ranges include Enartis's Plantis line (pea and potato), Laffort's Vegefine (patatin), and Agrovin's Proveget range, each formulated for specific wine styles and vinification stages.

• Patatin ranges in molecular weight from 15 kDa to 120 kDa, with the majority around 40 kDa, and has a pI of 4.6 that gives it low solubility at wine pH, reducing the risk of over-fining
• Pea protein isolates contain approximately 80 to 90 percent crude protein and have been shown to be non-allergenic under EU food labeling legislation, unlike casein and egg white which require mandatory label declarations
• Both pea and potato proteins are available in allergen-free, non-GMO formulations and are suitable for organic and biodynamic wine production in addition to vegan certification

Fining agents bind target compounds to form insoluble aggregates that are subsequently removed from the wine by settling and racking or filtration. Plant proteins interact with tannins and other phenolic compounds through protein-polyphenol complexation, the same mechanism used by traditional animal proteins. Research into potato protein fining kinetics shows that efficacy is significantly influenced by wine pH, ethanol concentration, and fining temperature. Winemakers conduct bench trials before full-tank treatment, selecting dosage based on the wine's phenolic profile. Dosing rates for legume-based commercial agents range from 5 to 30 g/hL depending on the stage of vinification and wine type.

• Potato protein fining kinetics are significantly influenced by wine pH, ethanol concentration, and temperature, making bench trials essential before cellar-scale application
• Pea protein shows particular effectiveness at clarification and at reducing flavanoid phenols, with studies confirming performance comparable to potassium caseinate at equivalent dosing rates of around 0.4 g/L
• Both agents are used in combination with other adjuncts such as PVPP or bentonite to broaden their effectiveness across different phenolic fractions and wine styles

Multiple independent studies confirm that no statistically significant sensory differences are detectable between wines fined with plant proteins and those fined with traditional animal-derived agents. Pea protein is noted for preserving fermentation aroma compounds better than some traditional agents and has a minor impact on proanthocyanidins, helping to preserve color in young red wines. Potato protein (patatin) reduces phenolics and tannins reactive with salivary proteins, thereby decreasing astringency, while research confirms it causes no depletion of the chromatic characteristics of red wines. Plant proteins generally show lower effectiveness than gelatin at reducing turbidity, but modify phenolic composition in ways that can preserve color quality and stability.

• Pea protein preserves fermentation aroma compounds better than some alternatives, with studies showing that fining young wines with plant proteins has lower impact on aromatic volatiles compared to gelatin
• An important advantage of pea protein isolate is the preservation of anthocyanins in young red wine, meaning color tonality is not significantly influenced at standard dosing rates
• Research confirms three vegetal proteins, pea, potato, and grape seed, reduce astringency in Cabernet Sauvignon similarly, despite their differing tannin removal profiles, making all three practical tools depending on the winemaker's goals

Plant-based fining agents were initially developed to serve consumers with special dietary requirements, including vegans, but a parallel and commercially significant driver has been the allergen labeling requirements for animal-derived fining agents. EU legislation requires mandatory label declarations for casein and egg white residues when detectable, while pea and potato proteins are not classified as major food allergens and therefore carry no such labeling burden. This practical regulatory advantage, combined with growing consumer interest in vegan and plant-based products across Australasia, the UK, Scandinavia, and North America, has accelerated commercial adoption. Major retailers in these markets increasingly flag vegan-certified wines at point of sale, creating a clear commercial incentive for producers.

• Pea protein is not listed among the allergens in Annex III of EU Directive 2003/89/EC, unlike casein from milk and ovalbumin from eggs, which require mandatory label declarations when detectable in finished wine
• New Zealand producers, particularly Marlborough Sauvignon Blanc makers, have been among the early adopters of plant-based fining agents, targeting vegan consumers in the UK and Scandinavian export markets
• Organic and biodynamic producers favor plant-based fining agents as part of a minimal-intervention philosophy, and these agents are approved for use in certified organic wine production in the EU and other major markets

Plant-based fining agents are permitted under the regulatory frameworks of all major wine-producing nations. In the United States, the TTB officially listed pea protein as an acceptable fining material under 27 CFR 24.250. In the EU, plant proteins are approved enological practices, and the OIV has adopted resolutions covering the use of vegetable protein fining agents. Commercially, the Enartis Plantis range offers pea protein and potato protein products, including Plantis AF (allergen-free pea protein), Plantis AF-P (potato protein), and Plantis PQ (potato protein with chitosan), all suitable for vegan, vegetarian, and allergen-free wine production. Laffort markets patatin-based Vegefine, and Agrovin offers the Proveget range covering both pea and potato protein applications.

• The TTB listed pea protein as an acceptable material for use in US wine production under 27 CFR 24.250, giving American winemakers formal regulatory clearance for vegan fining
• Enartis's Plantis PQ, a potato protein and chitosan combination, is specifically formulated for improving wine clarification, filterability, and aromatic cleanliness, and for reducing oxidized and oxidizable phenolic compounds
• The Vinofine Rouge product, developed through a four-year research project funded by the Occitania region and involving the Institut Français de la Vigne et du Vin (IFV) and the Institut Oenologique de Champagne (IOC), combines pea protein, potato protein, and bentonite, and is approved for both vegan and organic wines

Plant proteins are a genuine and scientifically validated alternative to animal-derived fining agents, though with some performance nuances winemakers should understand. Potato protein (patatin) shows astringency reduction comparable to gelatin, while pea protein is somewhat less effective at tannin removal but better at preserving anthocyanins and fermentation aromatics. Plant proteins generally reduce turbidity less efficiently than egg albumin in red wines, but the gap narrows when plant proteins are combined with PVPP or bentonite. Leeuwin Estate in Margaret River, one of Australia's most celebrated Chardonnay producers, confirms that its white wines are produced without animal-derived fining agents, demonstrating that plant-based or unfined approaches are compatible with premium quality. Bench trials are essential, as efficacy varies with phenolic composition, wine age, pH, and ethanol level.

• Research on Nebbiolo wine showed one pea-based fining agent had an effect on polymeric flavanol removal comparable to gelatin, with a lesser loss of anthocyanins, demonstrating that wine variety and phenolic profile are key variables in agent selection
• Potato protein fining was found to be significantly influenced by wine pH and ethanol concentration, underlining that plant protein fining is not a direct drop-in replacement and requires trial optimization for each wine
• Pea protein alone preserves the aroma profile closest to untreated control wines in aromatic white varieties, inducing no significant differences in ester and terpene concentrations, making it well suited to aromatic styles