Selenium (Se) is an indispensable micronutrient in the human body, which participates in various physiological and metabolic processes. Around the world, about 500 million to 1 billion people are at risk from selenium deficiency related diseases. In the agriculture-food system, selenium enters the food chain mainly from soil, and is accumulated in crops and then assimilated by the human body through diets. Using suitable agronomic measures to enhance the ability of crops to absorb and transform soil selenium can enable organic selenium to effectively accumulate in the edible parts of crops. However, the enrichment of selenium in crops does not mean that selenium can be completely retained in crop foods. The influence of food processing is extremely critical as well. Various processing conditions and parameters will affect the selenium content and speciation of the final products, thus affecting its bioavailability in the human body. This paper reviews the flow of selenium in the “soil-crop-food-human” chain, and summarizes the key factors that affect the content and speciation of selenium in foods and the bioavailability of selenium in the human body. It is suggested that all factors should be considered comprehensively to realize efficient conversion of selenium from farm to table.

Oil bodies are organelles that store lipid in oil crops, and they are natural oil-in-water structures. As an encapsulation system for hydrophobic active substances, they can be used to address issues such as poor water solubility and instability of hydrophobic active substances, and have attracted wide attention from researchers in recent years. The cell membrane of oil bodies is composed of phospholipids and proteins. Hydrophobic active substances could enter oil bodies through passive transport, but the encapsulation effect is affected by many factors and can be improved by physical methods (such as stirring, ultrasonic treatment and homogenization). This article reviews recent progress on the encapsulation of hydrophobic active substances by oil bodies, focusing on the composition and properties of oil bodies, the properties of and delivery systems for hydrophobic active substances, the commonly used methods for oil body encapsulation along with their advantages and disadvantages, and the stability and encapsulation effect of oil body emulsions. The aim is to provide ideas for exploring the encapsulation mechanism of hydrophobic active substances and constructing an efficient and stable loading system. It also aims to improve the stability, utilization rate, and bioaccessibility of active substances in order to lay a theoretical foundation for their application in fields such as foods, medicine, and cosmetics.