*Review* **Quercetin: Its Antioxidant Mechanism, Antibacterial Properties and Potential Application in Prevention and Control of Toxipathy**

**Weidong Qi † , Wanxiang Qi † , Dongwei Xiong † and Miao Long \***

Key Laboratory of Livestock Infectious Diseases, Ministry of Education,

College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China **\*** Correspondence: longmiao@syau.edu.cn

† These authors contributed equally to this work and should be considered co-first authors.

**Abstract:** Quercetin, as a flavonol compound found in plants, has a variety of biological activities. It is widely present in nature and the human diet, with powerful oxidative properties and biological activities. In this review, the antioxidant mechanism and broad-spectrum antibacterial properties of quercetin are revealed; the intervention effects of quercetin on pesticide poisoning and the pathway of action are investigated; the toxic effects of main mycotoxins on the collection and the detoxification process of quercetin are summarized; whether it is able to reduce the toxicity of mycotoxins is proved; and the harmful effects of heavy metal poisoning on the collection, the prevention, and control of quercetin are evaluated. This review is expected to enrich the understanding of the properties of quercetin and promote its better application in clinical practice.

**Keywords:** quercetin; antioxidant; toxipathy
