The development of compound surfactants is suitable for the needs of a variety of pesticide formulations. At present, there are many studies on the compound system of 2 ~ 3 surfactants in China, and there are few studies on the compound system of more than three surfactants. The development of multi surfactant complex system is a new direction of dispersion system research.

Alkyl glycosides are non-toxic and non irritating to human body, and biodegradation is rapid and complete. The final products of degradation are carbon dioxide and water, which has good ecological safety and compatibility. The green characteristics of alkyl glycosides make it have great advantages in the application of laundry detergent.

Alkyl polyglucoside (APG) is a mild surfactant developed in the world since 1990s. These surfactants can be synthesized from renewable plant resources. They not only have broad-spectrum antibacterial activity, but also have the advantages of rapid and complete biodegradation and no pollution to the environment. This paper attempts to take two typical red tide organisms, Prorocentrum dentatum 0201-01 and red tide heterobay algae, as examples to explore the effect of APG surfactants on the growth and killing of red tide organisms, in order to lay a foundation for the development of the application of these compounds in the control of harmful red tide.

In addition to changing the activity of the solution in aqueous solution, that is, reducing its surface tension, various properties related to washing, such as penetration, adsorption, wetting, dispersion, emulsification, gelling and foaming, will change significantly near the critical micelle concentration.

Surfactant has low toxicity and irritation, and has mild bactericidal and algal inhibition effect, which can effectively control the over reproduction of algae. However, it will not cause excessive water transparency, and can effectively promote the improvement of water microenvironment. Because the above surfactants have some functional groups of vitamins and amino acids, it is actually observed that they can promote growth. For example, BS-12 not only has good growth promoting effect, but also has good water quality adjustment, bacteriostasis and algae killing function.

The synthesis methods of alkyl glycosides mainly include trans glycoside method, direct glycoside method, Koenigs Knorr reaction method, enzyme catalysis method and so on.

Surfactants play an important role in pesticide formulations. The new varieties of surfactants developed have also attracted the attention of the pesticide industry. By changing the varieties of surfactants to improve or change the original processing dosage forms of some pesticide varieties, the biological activity is improved, the dosage is reduced, the cost is reduced, and the compatibility with the environment is improved.

Surfactants play an important role in pesticide formulations. The new varieties of surfactants developed have also attracted the attention of the pesticide industry. By changing the varieties of surfactants to improve or change the original processing dosage forms of some pesticide varieties, the biological activity is improved, the dosage is reduced, the cost is reduced, and the compatibility with the environment is improved.

Anionic surfactants such as alkyl naphthalene sulfonate, lignin sulfonate, alkyl thiosuccinate, polyoxyvinyl alkyl aryl sulfonate, etc; Nonionic surfactants such as polyoxyvinyl alkyl ether, polyoxyvinyl alkyl phenyl ether, polyoxyvinyl styryl phenyl ether, polyoxyvinyl alkyl ester, low substituted hydroxypropyl cellulose, hydroxymethyl starch sodium, microcrystalline cellulose, cross-linked polyvinylpyrrolidone, cross-linked carboxymethyl fiber sodium, effervescent disintegrating agent, etc, Single or two or more surfactants can be mixed. The actual production of crystal seeds, such as 20% bensulfuron methyl effervescent tablets, 20% pyrazosulfuron methyl effervescent tablets, 5% imidacloprid effervescent tablets, 18% dichloroquinic acid. Bensulfuron methyl effervescent tablets, 25% bensulfuron methyl effervescent tablets, 25% bensulfuron methyl effervescent tablets, etc.

Alkyl polyglucoside (APG) is a mild surfactant developed in the world since 1990s. These surfactants can be synthesized from renewable plant resources. They not only have broad-spectrum antibacterial activity, but also have the advantages of rapid and complete biodegradation and no pollution to the environment. The effects of APG surfactants on the growth and killing of red tide organisms were discussed in order to lay a foundation for the development of the application of APG surfactants in the control of harmful red tide.

Compared with chemical surfactants, biosurfactants have the advantages of biodegradability, low toxicity and simple production by microbial fermentation. They have a wide application prospect in red tide control. Rhamnolipid biosurfactants produced in the culture of Pseudomonas aeruginosa have strong antibacterial activity.

Alkyl glucosides have the advantages of ordinary nonionic and anionic surfactants: high surface activity, high viscosity, rich foam, fine and stable. It has obvious synergistic effect with other surfactants; It has strong dispersibility to calcium soap and can be used in hard water; Very low irritation to epidermis, mucosa and living cells; It is easy to biodegrade in the natural environment and has less environmental pollution. APG is formed by condensation of starch or its hydrolyzed sugar with fatty alcohol. The source of raw materials is very wide, which has attracted more and more attention in recent years.

Compared with chemical surfactants, biosurfactants have the advantages of biodegradability, low toxicity and simple production by microbial fermentation. They have a wide application prospect in red tide control. Rhamnolipid biosurfactants produced in the culture of Pseudomonas aeruginosa have strong antibacterial activity.

Anionic surfactants such as alkyl naphthalene sulfonate, lignin sulfonate, alkyl thiosuccinate, polyoxyvinyl alkyl aryl sulfonate, etc; Nonionic surfactants such as polyoxyvinyl alkyl ether, polyoxyvinyl alkyl phenyl ether, polyoxyvinyl styryl phenyl ether, polyoxyvinyl alkyl ester, low substituted hydroxypropyl cellulose, hydroxymethyl starch sodium, microcrystalline cellulose, cross-linked polyvinylpyrrolidone, cross-linked carboxymethyl fiber sodium, effervescent disintegrating agent, etc, Single or two or more surfactants can be mixed.

Organic surfactant used in pesticide formulations can effectively reduce the surface tension of water, reduce the contact angle between liquid and biological targets, increase the spray coverage, promote the rapid absorption of liquid, significantly improve the effective utilization rate of pesticides, reduce the use of pesticides, improve the safety of pesticide use, and have the characteristics of strong resistance to rainwater scouring and infiltration. Its synergistic effect on pesticides is mainly to maintain the effect of pesticides under the condition of reducing the dosage of pesticides, and reduce the residue of pesticides.

Modern high-density intensive aquaculture often uses fishery drugs and environmental improvers to prevent and treat aquatic animal and plant diseases, remove enemy organisms, improve the water environment and promote the healthy growth of aquaculture varieties.

The application of surfactants in aquatic pharmaceutical preparations can improve their production process, appearance properties and administration forms, such as stability, clarity, hardness, water solubility, disintegration, solubility, color and taste. In practical application, it can improve the bioavailability of drug preparations, but on the other hand, improper use of surfactants will interact with various components in drug prescriptions and produce physicochemical changes (redox and catalytic hydrolysis), which will affect the stability of drug preparations and even the curative effect. When selecting varieties, it should be studied before application in practice.

The reason why pesticides are accused of being the culprit of environmental safety is that, in addition to the backward level of use technology and the lack of scientific and rational use knowledge, the toxicity and cumulative pollution of various components in pesticide preparations are also very important, resulting in a series of negative problems such as environmental pollution, personnel poisoning, excessive residue and so on.

With the improvement of fishery intensive production, its breeding mode has also changed fundamentally, from the traditional small-scale free range breeding mode to intensive high-density breeding mode. However, there are no rules to follow for the transformation of this mode, and the local successful experience all over the world lacks the possibility of overall transplantation and promotion due to different regional environment, climate and water quality. Therefore, aquaculture has strong technical characteristics of regional aquaculture. Because the growth of aquatic animals is inseparable from the water system, all their activities are completed in the water, so the water body has become its vital survival area.

Although the surfactant itself has no biological activity, it can assist solid or liquid raw materials to disperse quickly, evenly and stably in the spray carrier, ensuring the distribution and attachment of pesticide solution on the surface of organism (plant leaf and worm surface), promoting the absorption of organism by drugs, and even increasing the transmission of drugs in organism. The purpose is to increase the retention amount of pesticides on the plant surface, prolong the retention time and improve the penetration ability to the plant epidermis, so as to improve the biological activity of pesticides, reduce the dosage, and reduce the harm of pesticides to human body and environmental pollution.