Overview
Medium-High Temperature Daqu Starter is a microbial culture critical for traditional Chinese baijiu production. Made from wheat (60–70%), barley, and peas, it undergoes a multi-stage fermentation process at 50–65°C to develop enzymes and flavor-producing microorganisms. Unlike low-temperature starters, it yields richer, aromatic compounds, making it ideal for premium liquors. Historically rooted in the Ming Dynasty, Daqu’s standardized production began in the 1950s. Modern variants are optimized for consistency, with strains like Saccharomyces cerevisiae and Bacillus subtilis dominating. Its B2B market is concentrated in Sichuan and Guizhou provinces, supplying major distilleries.
Physical and Chemical Properties
Daqu’s properties vary by fermentation duration and temperature. Typical moisture content is 8–12%, with pH 5.5–6.5. It contains 20–30% crude protein and active enzymes (e.g., α-amylase at 200–400 U/g). The starter’s porous structure aids aeration, promoting microbial growth. Key chemical markers include ethyl caproate and tetramethylpyrazine, which contribute to baijiu’s fruity and nutty notes. Its water activity (Aw) of 0.65–0.75 prevents pathogen growth while sustaining beneficial microbes. High-quality Daqu exhibits uniform coloration and a distinct fermented aroma.
Main Applications
This starter is exclusively used for baijiu, especially strong-aroma (浓香型) and sauce-aroma (酱香型) varieties. It catalyzes simultaneous saccharification and fermentation (SSF), converting starches to sugars and alcohols over 30–60 days. Brands like Maotai rely on Daqu’s thermophilic microbes to withstand pit fermentation temperatures. In craft distilleries, Daqu is blended with Xiaoqu (small starter) to balance efficiency and flavor complexity. Recent R&D explores its potential in biofuel and enzyme production, though baijiu remains its primary market.
Safety and Storage
Daqu is non-hazardous but requires careful handling to maintain viability. Prolonged exposure to humidity (>70% RH) triggers mold overgrowth, while temperatures above 40°C deactivate enzymes. Suppliers often vacuum-pack blocks to extend shelf life to 6–12 months. Workers should wear dust masks to avoid respiratory irritation from airborne spores. Storage areas must be rodent-proof, as pests can disrupt microbial balance. Post-opening, unused Daqu should be resealed in breathable containers to prevent condensation.
B2B Procurement Guide
Procure Daqu from certified producers with GC-MS (gas chromatography) reports to verify microbial and enzyme profiles. Prioritize suppliers near baijiu hubs (e.g., Renhuai, Yibin) for fresher stock. Bulk orders (≥1 ton) typically cost 10–15% less, with MOQs around 100 kg. Inspect for uniform texture and absence of off-odors (e.g., ammonia). Negotiate testing clauses for moisture and microbial counts. For international buyers, consider CIP terms to offset logistics costs, as海运 (sea freight) is common for large shipments.
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