1. Introduction to lignans.
Lignans are a class of natural products that are widely found in plants and have a variety of bioactive and pharmacological effects. Lignans usually have the combination of aromatic rings and aliphatic alcohol groups to form a polycyclic structure, which has strong antioxidant, anti-inflammatory, anti-tumor and other effects. At present, lignans have been widely used in medicine, food, cosmetics and other fields.
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2. Introduction to ultrasonic extraction technology.
Ultrasonic extraction technology is an efficient and environmentally friendly extraction technology, which uses the vibration and cavitation of ultrasonic waves to accelerate the dissolution and diffusion of target components, thereby improving the extraction efficiency. Ultrasonic extraction has been widely used in the extraction of natural products due to its advantages of simple operation, short extraction time, low solvent dosage and high extraction efficiency.
3. Process conditions for ultrasonic extraction of lignans.
1.Ultrasonic power: Ultrasonic power is an important factor affecting extraction efficiency. With the increase of ultrasonic power, cavitation is enhanced, which is conducive to the dissolution and diffusion of the target components. However, excessive ultrasonic power may damage the structure of the target component and affect the extraction effect. Therefore, it is necessary to select the appropriate ultrasonic power according to the actual situation.
2.Extraction temperature: Extraction temperature is also an important factor affecting extraction efficiency. As the temperature increases, the molecular thermal movement accelerates, which is conducive to the dissolution and diffusion of the target components. However, excessively high temperatures may damage the structure of the target ingredient and affect the extraction effect. Therefore, it is necessary to select the appropriate extraction temperature according to the actual situation.
3.Extraction time: Extraction time is also one of the factors that affect extraction efficiency. As the extraction time increases, the dissolution and diffusion of the target components gradually increases. However, too long an extraction time may damage the structure of the target ingredient and affect the extraction effect. Therefore, it is necessary to choose the appropriate extraction time according to the actual situation.
4.Solvent type and concentration: The type and concentration of solvent are also one of the factors affecting the effect of ultrasonic extraction. Different solvents have different solubility for different target components, so it is necessary to select the appropriate solvent and concentration according to the actual situation. Common solvents include methanol, ethanol, acetone, etc.
5.Other factors: In addition to the above factors, there are many other factors that will affect the ultrasonic extraction effect, such as raw material particle size, ultrasonic probe insertion depth, etc. These factors also need to be optimized on a case-by-case basis.
IV. Conclusions. In this paper, the process conditions for ultrasonic extraction of lignans are introduced, including ultrasonic power, extraction temperature, extraction time, solvent type and concentration, and other factors. These factors all have a certain impact on the extraction effect and need to be optimized. It is hoped that this paper can provide a reference for research and application in related fields.
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