# Study on the Influence of Consumers' Purchase Intention of Selenium-Rich Agricultural Products
## 2 Research Progress at Home and Abroad  
Foreign research on selenium is relatively early and uneven in the field of research, focusing mainly on natural sciences, while research on economics is relatively shallow and data are scarce. Around 1950, research focused on poisoning caused by high selenium, and after 1970, research focused on the function of selenium on human nutrition and health [15]. The two stages of research are still in the exploratory stage. In 1973, the WHO first began to attach great importance to the element \"selenium\" and concluded that it is an essential element for the physiological function of the body [16]. The announcement of the WHO has guided research on selenium in the world. Therefore, there are more and more biological researches on selenium, and there is a great breakthrough in the application of selenium in the medical field. In general, research on selenium abroad specifically includes: research on the physiological effects of selenium on the human body, animals and plants, research on the effects of selenium on plants and agricultural products, research on the quality and safety of selenium, etc. The main research results are summarized in Table 1 below. The research time and content of foreign scholars on selenium are as follows. With the continuous development and maturity of the theoretical foundation of selenology abroad, people have shifted their perspectives to develop a series of selenium-enriched products involving different levels and fields [17; 18]. From inorganic selenium to natural organic selenium; from natural selenium-containing crops to today's high-tech nanosele-nium, the transformation has gone through three stages: natural transformation \(\rightarrow\) artificial transformation \(\rightarrow\) synthetic organic selenium-rich products [19; 20]. China's selenium-rich agriculture is still in the initial stage, the corresponding research is still limited, there are not many statistics, and the economy needs less analysis. Geographically, it is mainly concentrated in selenium-rich areas, especially in the two areas of Hubei Enshi and Shaanxi Ankang, where the most research is conducted; for the research content, there are more studies on the mechanism of selenium's physiological effects, selenium-rich production technology, selenium-rich product quality and quality and safety standards. The following mainly summarizes the research progress of the selenium-rich industry in China and the Enshi region from the research of selenium-rich agricultural products development, selenium-rich agricultural industrialization, selenium-rich agricultural brand research, selenium-rich agricultural research and development, and selenium-rich agricultural policy research. (1) Research on the development of selenium-rich agricultural products \begin{table}
\begin{tabular}{c c c} \hline \hline
**Researcher** & **Year** & **Research Contents** \\ \hline [PERSON] & 2008 & The effects of selenium in Britain on crops were studied \\ \hline [PERSON] & 2006 & The effects of selenium on nutrition and health were studied, taking human body and livestock as research objects \\ \hline [PERSON] & 2003 & The detoxification of selenium is studied, and it is believed that it can alleviate toxicity caused by heavy metals \\ \hline [PERSON] & 2002 & According to research, existing forms of organic selenium amino acids in yeast are mostly selenocysteine and selenomethionine \\ \hline [PERSON] & 2000 & According to research, on basis of meeting certain conditions, yeast has ability to transform water-soluble selenium salts such as sodium selenite into organic selenium compounds, and then absorb compounds \\ \hline [PERSON] & 1999 & Studies have shown that lack of selenium in body is a typical feature of AIDS people \\ \hline [PERSON] & 1998 & According to research, selenium can prevent and treat a series of diseases such as liver cancer, gastrointestinal cancer, skin cancer, etc. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Research Time and Content of Selenium by Foreign Scholars.