Avobenzone is a broad-spectrum UVA absorbent, mainly used in sunscreen products. It can effectively absorb UVA band ultraviolet rays, reduce the damage of ultraviolet rays to the skin, and prevent sunburn, sunburn, skin cancer and other problems.
In addition to sunscreen products, Avobenzone is also used in other cosmetics, such as face cream, body lotion, lipstick, etc., to provide additional UVA protection. In addition, Avobenzone can also be used in industrial fields such as dyes, plastics and coatings as a UVA absorbent.
It should be noted that Avobenzone will lose its stability under some conditions, such as light, oxidation, etc., so attention should be paid to its use and storage. Other compounds, such as light stabilizers and antioxidants, may be added to some sunscreen products to improve the stability of Avobenzone. When selecting and using sunscreen products, you should make reasonable selection and use according to your skin texture, sunscreen needs, environment and other factors.
Avobenzone (4-aminobenzoic acid - 2 - (4-methoxyphenyl) - 2-oxy-1,3-dimercaptopentane) is an organic compound used for sun protection. It is a broad-spectrum UVA absorbent, capable of absorbing 320-400nm ultraviolet radiation. However, the reactive nature of Avobenzone may affect its stability in sunscreen. The following are the reaction properties of Avobenzone:
1. Photodecomposition: Avobenzone is prone to photodecomposition under ultraviolet radiation, thus losing its absorption capacity. This reaction has limited its use in sunscreen and needs to be used in combination with other stabilizers to ensure its stability.
2. Interaction with other compounds: Avobenzone interacts with some other compounds, which may lead to its degradation or loss of absorption. For example, it may react with some metal ions or reducing agents.
3. Pigment formation: In some cases, Avobenzone can react with oxygen to form colored compounds, which may reduce its absorption capacity.
In order to ensure the stability of Avobenzone in sunscreen, it is often necessary to take various measures, such as adding antioxidants, light stabilizers or humectants, to protect it from the influence of light, heat or other chemicals.
The synthetic route of Avobenzone (4-aminobenzoic acid - 2 - (4-methoxyphenyl) - 2-oxy-1,3-dimercaptopentane) is as follows:
1. Synthesis of 4-aminobenzoic acid (PABA): reaction of benzoic acid with ammonia, reduction, oxidation and other steps to finally obtain PABA.
2. Synthesis of 4-methoxyphenylacetone: 4-methoxyphenylacetone is obtained by reaction of acetophenone with methanol through acid catalysis and methylation.
3. Synthesis of 2-hydroxy-4-methoxybenzophenone: 2-hydroxy-4-methoxybenzophenone was obtained by reaction of 4-methoxyphenylethanone with benzodioxane 3,4-dione (BMDBM) through reduction and recrystallization.
4. Synthesis of Avobenzone: 4-aminobenzoic acid, 2-hydroxy-4-methoxybenzophenone, 1,3-dimercaptopentane and other compounds are reacted, and finally Avobenzone is obtained through condensation, acylation and other steps.
The synthetic route of Avobenzone is complicated, requiring multi-step reaction and complex synthetic technology.
Avobenzone is a broad-spectrum UVA absorbent, which was found to have sunscreen effect as early as the 1960s. With the deepening of people's understanding of the harm of ultraviolet radiation, sunscreen products have been widely used, and Avobenzone has also been widely used as a major sunscreen ingredient.
However, the stability of Avobenzone in sunscreen has always been a problem. In light, oxidation and other environments, Avobenzone is easy to decompose, thus losing its sunscreen effect. In order to solve this problem, people have done a lot of research and found that the stability of Avobenzone can be improved by adding other compounds, such as light stabilizers and antioxidants.
At present, Avobenzone is still an important component of sunscreen, and its sunscreen effect is widely recognized worldwide. With the increasing demand for sunscreen ingredients, people are also constantly seeking more stable and effective sunscreen ingredients. In the future, Avobenzone's development prospects are still very broad, but it needs continuous improvement and innovation to improve its stability and sunscreen effect. At the same time, it also needs to pay attention to the safety of human body and environment.