Abstract: Provided is a method for coupling flavonoid-containing compounds to provide flavonoid dimers, trimers and oligomers. The method comprises contacting a flavonoid-containing compound with base in the presence of air. Flavonoid dimers, trimers and oligomers may also be useful in the treatment of diseases, such as fungal infections and diseases associated with starch hydrolase.

Abstract: A method for improving a cement spraying efficiency for a self-repairing tire includes: inputting tire parameters into a control system, including rim diameter, section width, aspect ratio, cement thickness and cement density; calculating a cement spraying amount for a tire; calculating a crown cement thickness separately; starting a spraying device, and evenly spraying a cement in a cement storage tank on a tire surface; and finally drying, that is, heating to speed up solidification of the cement, thereby completing self-repair. The control system automatically calculates the cement spraying amount required for repair based on the tire parameters such as section width, aspect ratio and rim diameter, and realizes mass production of self-repairing tires according to the characteristics of the tires. The method is applicable to all tires of different specifications, and can realize a one-time spraying operation, thereby improving the spraying efficiency for self-repairing tires.