Overview
Beef extract is a nutrient-dense derivative obtained by boiling beef tissues and concentrating the resulting broth. It serves as a key ingredient in microbiological culture media due to its high content of peptides, amino acids, and growth factors. Historically, it was developed in the 19th century for bacterial cultivation and remains indispensable in labs and industries today. Modern production involves enzymatic hydrolysis or thermal processing to preserve bioactive components. Its standardized formulations ensure consistency in applications ranging from clinical diagnostics to food additive manufacturing.
Physical and Chemical Properties
Beef extract typically appears as a viscous paste or free-flowing powder, depending on the dehydration method. Its dark brown color and meaty aroma are characteristic. The extract is highly soluble in water, forming a slightly acidic solution (pH ~6.5). Chemically, it contains 10–15% nitrogen (primarily from amino acids like glutamine and arginine), vitamins (e.g., B12, niacin), and minerals (iron, zinc). Its hygroscopic nature requires airtight packaging to prevent moisture absorption and spoilage.
Main Applications
In microbiology, beef extract is a cornerstone of nutrient agar and broth formulations, supporting the growth of fastidious bacteria like Streptococci. It provides essential nutrients absent in synthetic media. The food industry uses it as a natural flavor enhancer in soups, sauces, and processed meats. Pharmaceutical applications include vaccine production and enzyme testing. Recent innovations explore its use in cell culture media for biotechnology.
Safety and Storage
While non-hazardous, beef extract requires careful handling to avoid microbial contamination. Sterile grades must be used in labs, while food-grade batches need allergen labeling. Suppliers often provide certificates of analysis for endotoxin levels. Storage at refrigeration temperatures extends shelf life to 2–3 years. Opened containers should be resealed tightly to prevent oxidation. Freezing is not recommended as it may alter solubility.
B2B Procurement Guide
Industrial buyers should prioritize suppliers adhering to ISO 13485 (for medical use) or FSSC 22000 (food-grade). Bulk orders (25+ kg) often attract 10–15% discounts. Technical specifications to verify include total nitrogen content (min. 10%) and microbiological purity (<100 CFU/g). For international shipments, select冷链物流 (cold chain logistics) providers to maintain stability. Sample testing for heavy metals (lead, mercury) is advised, especially for Asian-sourced products.
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