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Flavonoids are natural ingredients commonly used in cosmetics, mainly for their antioxidant and anti-inflammatory effects, but they also present a variety of other biological activities such as antimicrobial, whitening, and anti-ultraviolet. Therefore, flavonoids have a huge application potential waiting to be explored. In this review, firstly, the numerous biological properties of flavonoids used in cosmetics, as well as examples of their applications in cosmetics are presented, with their biosynthetic pathways addressed. Then, recent advances in biosynthesis of typical flavonoids (e.g., phloretin, naringenin, apigenin, luteolin, chrysin, rutin, and anthocyanins) are reviewed and discussed, with a focus on the novel synthetic biology and metabolic engineering strategies to improve the productivity and yield of biosynthesized flavonoids, including the enhancement of precursor supply, characterization and modification of key enzymes, regulation of gene expression, and optimization of fermentation processes. With the continuous innovation of synthetic biology technology, there has been an increase in the efficiency of flavonoid biosynthesis and a significant reduction in production cost, which contributes substantially to the widespread use of flavonoids in cosmetics. However, the prevalence of poor solubility and low stability of flavonoids limits their applications in cosmetics. To address this issue, we outline the research process of two main strategies: nanocarrier technology and moiety modification. The application of these research results opens up new possibilities for the use of flavonoids in cosmetics. At the end, we discuss two major challenges in high-yield synthesis of complex flavonoids: the difficulty of key enzyme modification and the imbalance of metabolic flux. We also look forward to AI-assisted synthetic biology to address these challenges and drive the yield improvement and industrialization of flavonoid biosynthesis, providing biotechnological power for the development and innovation of the cosmetics industry.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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