**7. Opportunity and challenge**

Nowadays, in the development trend of the world for surviving and developing in parallel with various functional food and pharmaceutical products in different countries, functional-antioxidant foods have to face numerous opportunities and challenges, such as the technology and science advancement, the aging increase, and expanding global trade. Aging is the biggest threat to humans and causes about 80 different diseases in the world. It is the growth of aging populations, environmental pollution, and life pressures that leads to disease and economic burdens. With

#### **Figure 22.**

*The production shematic of functional-antioxidant powder from by-product maizes.*


**Figure 23.**

*The production shematic of functional-antioxidant hard pill from by-product maizes.*


#### **Table 2.**

*Statistical descriptives of antioxidant content in some food (mmol/100 g) [91].*

the development of science and technology, antioxidant bioactive substances are exploited more effectively and thoroughly. However, the uniformity of science and technology in various regions does still not happen. Awareness increase, economy,

and global trade ability lead to the criteria of the goods choice of human more difficult. The difference in antioxidant content in various foods occurs. These are both opportunities and challenges to develop antioxidant supplement products (**Table 2**).
