U-¹³C Cellulose from broccoli is the ¹³C labeled Cellulose (HY-B2221). Cellulose is a natural high molecular weight polysaccharide found in many plants and organisms. It is widely used in manufacturing industries, such as in paper making, textiles, food and medicine, etc. As a renewable resource, Cellulose is biodegradable and sustainable, and can also be used to manufacture chemicals such as Cellulose Esters, Cellulose Acetate and Cellulose Nitrate. In addition, Cellulose is often used as a food additive to increase the stability and quality of food^[1].