At present, the concept of green and sustainable products is sweeping the beauty industry. Consumers' needs for skin care and makeup have evolved from simple makeup modification and basic skin care to multiple demands for safety, efficacy, ultimate skin feel, and environmental friendliness. As a natural biomass nanomaterial derived from wood, plant peels, and agricultural and forestry wastes, nanocellulose has not only become the core raw material of green beauty formulas with its renewable, biocompatible, fully degradable characteristics, and unique optical and structural properties, it has also revolutionized traditional functional pigment systems, promoting the beauty industry to get rid of chemical dependence, bid farewell to microplastic pollution, and open a new track for natural and dye-free beauty. 1. Nanocellulose: Natural low-carbon nanobiomass substrate Nanocellulose is a polymer material that disassembles natural plant fibers into 1-100 nanometers through processes such as mechanical, enzymatic hydrolysis, chemical modification, etc. It is mainly divided into two categories: cellulose nanocrystals (CNC) and cellulose nanofibers (CNF). Different from chemical

Driven by the dual goals of plastic pollution control and 'double carbon', the food packaging industry is in urgent need of green and efficient alternative materials. The inherent defects of traditional packaging materials make it difficult to balance environmental protection and practical needs. The emergence of natural nanocellulose, with its unique material advantages, provides a new path for transformation and breakthrough in the field of food packaging. 1. The industry dilemma of food packaging: the dilemma between environmental protection and performance. Traditional food packaging is mainly made of plastic. Although it is convenient and low-cost, it is not degradable, causing serious 'white pollution', and the recycling rate is extremely low; while degradable materials such as paper and starch-based materials have the disadvantages of low mechanical strength and poor barrier properties, which cannot meet the needs of long-distance transportation and long-term storage. The emergence of nanocellulose has solved this dilemma. 2. Nanocellulose: The core characteristics and mechanism of action of adapted food packaging. Nanocellulose originates from natural biomass and is extracted through various processes. It is divided into three categories: cellulose nanocrystals, fibrils and bacterial nanocellulose.

Core summary: Bacterial Cellulose (BC) is a natural nano-biopolymer synthesized by microorganisms. It has the advantages of high purity, high crystallinity, green degradability, etc. It is widely used in medical and health, food industry, high-end manufacturing, green packaging and other fields. It meets the 'double carbon' goal and is the core material to promote green innovation and upgrading of the industry. 1. What is bacterial cellulose (BC)? Bacterial cellulose is a natural nano-biopolymer synthesized by fermentation of acetic acid bacteria and other microorganisms using D-glucose as a carbon source. Compared with traditional plant cellulose, it has irreplaceable core advantages and is a generally recognized as safe (GRAS) material recognized by the US FDA. Its core characteristics are outstanding: purity is as high as 99%, crystallinity is 60%-90%, fiber diameter is only 20-100 nanometers, forming a three-dimensional network structure with high porosity; it has excellent mechanical properties and water-holding capacity, and the synthesis process is low