Overview
Clam Shell (Ge Ke) is a traditional Chinese medicinal material derived from the calcined shells of marine bivalves, primarily Meretrix meretrix or Cyclina sinensis. It has been used in TCM for over 2,000 years, first documented in the 'Shennong Bencao Jing.' The shells are collected, cleaned, and calcined at high temperatures to produce a fine powder or fragmented form. In TCM theory, Clam Shell is classified as salty and cold in nature, entering the lung and stomach meridians. Its primary functions include clearing phlegm, softening hardness, and neutralizing stomach acid. Modern research confirms its high calcium carbonate content (typically 90-95%) along with trace minerals like magnesium and zinc.
Physical and Chemical Properties
Processed Clam Shell is predominantly calcium carbonate (CaCO₃) with a crystalline structure altered by calcination. The calcination process (typically at 800-900°C) increases porosity and surface area, enhancing its medicinal reactivity. X-ray diffraction analysis shows conversion to calcium oxide (CaO) during calcination, which gradually reabsorbs CO₂ from air to form CaCO₃ again. The material exhibits mild alkalinity (pH ~9-10 when suspended in water) and demonstrates notable adsorption capacity for toxins and acids. Particle size varies by processing method - traditional mortar-ground powder averages 50-100μm, while modern micronized versions may reach 10-20μm for enhanced bioavailability.
Main Applications
In clinical TCM practice, Clam Shell is commonly combined with other herbs to treat respiratory conditions like chronic cough with thick phlegm, especially in patterns involving lung heat. Its alkalizing properties make it effective for gastric hyperacidity and peptic ulcers when used in formulas such as 'Zuojin Wan.' Externally, the fine powder serves as a wound dressing for slow-healing ulcers due to its absorbent and mildly antimicrobial properties. Modern applications include use as a calcium supplement in some health products, though its bioavailability is lower than citrate or lactate forms. Recent research explores its potential in bone tissue engineering scaffolds due to its natural porosity.
Safety and Storage
Clam Shell preparations are generally safe at TCM-recommended doses (3-15g/day decocted), but overuse may cause constipation or alkalosis. Contraindications include cold deficiency patterns with diarrhea. Drug interactions may occur with acidic pharmaceuticals (e.g., tetracyclines, iron supplements) due to pH effects on absorption. Proper storage requires moisture-proof containers (glass or metal preferred) in low-humidity environments below 25°C. Processed material should be protected from CO₂ exposure to prevent caking. Shelf life typically reaches 3 years when stored correctly, with efficacy declining as re-carbonation progresses. Industrial-scale storage often uses nitrogen-flushed bags for long-term preservation.
B2B Procurement Guide
Quality assessment focuses on three parameters: calcium content (≥90% by titration), heavy metal limits (Pb <5ppm, As <2ppm), and microbial counts (<1000 CFU/g). Premium grades exhibit uniform white color without black spots (indicating incomplete calcination). Bulk buyers should verify species authentication (often requiring PCR testing) to avoid substitutes like oyster shell. Pricing tiers reflect processing methods - traditionally calcined shells command 20-30% premiums over industrial kiln products. Major production regions include Shandong, Jiangsu, and Zhejiang provinces in China. MOQs typically start at 50kg for powder form, with lead times of 2-4 weeks for customized particle sizes.
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