The kit comprises the following main components: buffer solution, coenzyme, pyruvic acid, ammonia chloride, pyruvate oxidase, glycine oxidase, alanine dehydrogenase and a stabilizer.
The activity of resistance-related enzymes, such as phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POD) were higher than that of control.