Overview
Fermented grape pomace is a winemaking byproduct generated after juice extraction, consisting primarily of grape skins (60-70%), seeds (20-30%), and stems (0-10%). The fermentation process alters its chemical composition, increasing polyphenol content while reducing simple sugars. Approximately 20-30% of processed grape weight becomes pomace, making it a significant waste stream in wine-producing regions. This material has transitioned from waste to valuable resource due to its rich bioactive compounds. The global wine industry produces about 10-13 million tons annually, with disposal costs prompting innovative reuse strategies. Its composition varies by grape variety (Cabernet, Merlot, etc.), fermentation duration, and pressing methods.
Physical and Chemical Properties
The material exhibits high water retention capacity (3-4 times its weight) due to fibrous cellulose and pectin content. pH ranges from 3.5-5.0, reflecting residual tartaric and malic acids. Proximate analysis typically shows 15-25% lignin, 10-20% hemicellulose, and 2-5% protein on dry weight basis. Key bioactive components include anthocyanins (50-500 mg/kg), flavonols (200-1000 mg/kg), and condensed tannins (1-5% DW). The seeds contribute 5-8% oil content (dry basis) rich in linoleic acid. Antioxidant capacity, measured by ORAC, ranges 50-200 µmol TE/g depending on grape variety and extraction methods.
Main Applications
In agriculture, pomace serves as livestock feed (limited to 10-15% of ruminant diets due to tannins) or compost ingredient (C:N ratio ~30:1). Industrial uses include tartaric acid recovery (yielding 5-10 kg/ton) through calcium salt precipitation and grape seed oil extraction (100-150 kg oil/ton seeds). The nutraceutical industry values pomace for polyphenol extracts used in supplements (60-80% purity). Emerging applications include bioethanol production (80-100 L/ton via enzymatic hydrolysis) and as binder in biomass pellets. Some distilleries repurpose it for grappa or pomace brandy production.
Safety and Storage
Fresh pomace requires prompt processing (within 48 hours) to prevent spoilage, typically through drying (to <10% moisture) or ensiling. Spontaneous combustion risk exists in piles >3m due to microbial heat generation. Containers should resist corrosion from acidic leachate (pH <4). Workers handling dry pomace dust need N95 masks—particle sizes <10µm may constitute 15-30% of material. The EU classifies it as non-hazardous waste (EWC code 020301), though some jurisdictions regulate alcohol content (>1% requires special transport permits).
B2B Procurement Guide
Major suppliers include cooperative wineries (50-500 ton batches) and processing intermediaries offering dried (90% DM) or pelletized forms. Contracts should specify: a) pesticide history (organic vs conventional), b) stem content (<5% preferred for most uses), and c) absence of spoilage indicators (acetic acid >0.5%). Quality tests include NIR for fiber content, Folin-Ciocalteu for polyphenols, and HPLC for specific antioxidants. Bulk shipments commonly use 20-foot containers with plastic lining (moisture barrier). Spot prices fluctuate seasonally—lowest post-harvest (September-November in Northern Hemisphere).
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