Astragalus extract, a traditional Chinese medicine extract rich in various active ingredients, may face the risk of component degradation during storage, thus affecting its efficacy and safety. Its main active ingredients include astragaloside A, astragalus polysaccharides, flavonoids, amino acids, and trace elements. These components may undergo chemical or physical changes under specific storage conditions, leading to reduced activity or inactivation.
Astragaloside A, as one of the core active ingredients of astragalus, is susceptible to degradation by light, temperature, and oxygen. Light accelerates the reaction of photosensitive groups in its molecular structure, leading to the decomposition of the active ingredient; high temperatures may trigger oxidation reactions, damaging its chemical structure; and oxygen contact accelerates the degradation of astragaloside A through free radical reactions. Therefore, it is essential to strictly avoid light during storage, control the temperature within a cool range, and use sealed packaging to minimize oxygen exposure.
The stability of astragalus polysaccharides is significantly affected by humidity. Polysaccharide molecules are highly hygroscopic; if the storage environment has excessively high humidity, they are prone to absorbing moisture and clumping, and may even lead to microbial contamination. Furthermore, polysaccharides may polymerize or degrade due to changes in intermolecular forces during long-term storage, affecting their bioactivity. Therefore, astragalus extract must be stored in a dry environment, and the moisture-proof properties of the packaging material must be ensured to maintain the stability of the polysaccharides.
Flavones are another important class of active components in astragalus, and their stability is significantly affected by pH and metal ions. In acidic or alkaline environments, flavonoid molecules may undergo structural isomerization or hydrolysis, leading to loss of activity; metal ions may accelerate their oxidative degradation through chelation. Therefore, contact with acidic or alkaline substances should be avoided during storage, and the use of metal containers should be minimized to protect the stability of flavonoid components.
Although amino acids and trace elements are present in low amounts in astragalus extract, their stability also requires attention. Amino acids are susceptible to Maillard reactions due to temperature, producing brown substances and reducing nutritional value; trace elements may lose their activity due to oxidation or interaction with other components. Therefore, temperature fluctuations must be controlled during storage, and coexistence with oxidizing substances should be avoided to maintain the stability of these components.
To effectively control the storage stability of astragalus extract, comprehensive measures are required. First, the choice of packaging materials is crucial; composite packaging that is light-proof, moisture-proof, and has good sealing properties, such as aluminum foil bags or brown glass bottles, should be used to reduce the impact of external factors on the components. Second, the storage environment must be kept cool and dry, avoiding direct sunlight and high temperature and humidity conditions to slow down the degradation rate of the components. In addition, regular testing of the active ingredient content and microbial indicators of stored samples can promptly identify potential problems and adjust storage strategies.
In industrial production, the stability control of astragalus extract also requires process optimization. For example, reducing the water content of the extract through spray drying technology can reduce the risk of microbial contamination and extend shelf life; using vacuum packaging or nitrogen-filled packaging can further reduce oxygen content and inhibit oxidation reactions. Simultaneously, establishing a strict quality control system to monitor raw materials, intermediates, and finished products throughout the entire process can ensure the quality stability of astragalus extract during storage.
The storage stability of astragalus extract is affected by various factors and needs to be ensured through comprehensive measures such as optimized packaging, controlled environmental conditions, and strengthened quality monitoring. Through scientific and reasonable storage management, the stability of its active ingredients can be maintained to the maximum extent, thereby ensuring the efficacy and safety of astragalus extract in clinical applications and health care.
