Overview
Lentinan is a high-molecular-weight polysaccharide-peptide complex derived from the fruiting bodies of shiitake mushrooms (Lentinula edodes). It belongs to the β-glucan family and is renowned for its immunomodulatory effects. First isolated in Japan in the 1960s, lentinan is now clinically used as an adjunctive therapy for cancers and infections due to its ability to activate macrophages, T-cells, and natural killer cells. In industrial production, lentinan is extracted via hot water or enzymatic methods, followed by purification steps like ultrafiltration. Its quality is assessed by polysaccharide content (typically ≥95%), peptide ratio, and absence of contaminants. Unlike synthetic drugs, lentinan offers a natural biocompatible profile, making it popular in integrative medicine.
Physical and Chemical Properties
Lentinan consists of a β-1,3-glucan backbone with β-1,6-glucan side chains and peptide moieties, contributing to its biological activity. The compound is hygroscopic and forms viscous solutions in water but remains stable under acidic conditions (pH 3–7). Its high molecular weight limits oral bioavailability, often necessitating intravenous or intramuscular administration in clinical settings. Thermogravimetric analysis shows decomposition starting at 200°C, with no distinct melting point. Lentinan’s solubility in water enables formulation into injectables, capsules, or functional beverages. Critical quality parameters include molecular weight distribution (measured via GPC) and endotoxin levels (<0.5 EU/mg for pharmaceutical grades).
Main Applications
Lentinan’s primary use is in oncology, where it enhances the efficacy of chemotherapy while reducing side effects. Approved in Japan and China for gastric cancer treatment, it prolongs survival by stimulating immune responses. In nutraceuticals, lentinan is formulated into capsules or powders to support general immunity, often combined with vitamins or other mushroom extracts like AHCC. Research explores its potential in antiviral therapies (e.g., against HPV or hepatitis) and wound healing. The food industry incorporates lentinan into soups and beverages as a functional ingredient, leveraging its umami flavor and health benefits. B2B buyers should prioritize GMP-certified suppliers for clinical-grade material.
Safety and Storage
Lentinan exhibits low toxicity, with LD50 values exceeding 2,000 mg/kg in rodents. Adverse effects are rare but may include mild fever or skin reactions in sensitive individuals. Intravenous use requires medical supervision to monitor for hypersensitivity. Proper storage is critical to maintain stability. The powder should be kept in vacuum-sealed bags with desiccants, avoiding temperature fluctuations. Solutions must be sterile-filtered and used within 24 hours if unpreserved. Suppliers must provide certificates for heavy metals (e.g., <10 ppm lead) and microbiological safety (total plate count <1,000 CFU/g).
B2B Procurement Guide
When sourcing lentinan, buyers should specify purity (≥95% by UV-HPLC), peptide content (5–20%), and absence of starch (tested via iodine reaction). Bulk pharmaceutical-grade material typically costs $50–$150/g, while nutraceutical grades range $20–$80/g. Key suppliers are located in China, Japan, and the US, with MOQs starting at 100g. Audit suppliers for ISO 13485 or NSF certification, and request batch-specific COAs for identity (FTIR), potency (anthrone assay), and residuals (solvents, pesticides). For injectables, ensure endotoxin testing meets USP <85> standards. Logistics require temperature-controlled shipping to prevent degradation.
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