Composition of amino acids in strawberry fruits determined by gas chromatography with flame ionization under the influence of CO, NOx and SO2

Introduction Amino acids are included in almost all related products such as juice, syrup, jam, jelly and wine. (Silva et al., 2005; Hua et al., 2014). In plant material, amino acids are present in free form (L configuration). Among the high consumption fruits, strawberries are widely used in various places around the world, such as the manufacture of jams, jellies and decorative cakes. Because of the high consumption, strawberry fruit is widely grown throughout the year through direct heating system and CO2 fertilizer unit regardless of temperature, humidity and greenhouse humidity.

Two of the pollutants, SO2 and NOx, are the main pollutants causing acid rain (commonly known as acid rain). Sulfur dioxide and nitrogen oxide emissions react with water vapor in the air and other chemicals to form acids that fall to the earth. Prior to regulating these emissions, the power station had emitted most of sulfur dioxide emissions (about two-thirds) in the United States. Most of the NOx emissions (about 50%) come from automobiles, buses, trucks and other means of transportation, and the power plant occupies about 25%. The rest comes from other sources like industrial and commercial boilers

Sulfur dioxide (SO 2) and nitrogen oxides (NO x) are the main contaminants causing acidic precipitation. Power plants that burn coal and heavy oil produce more than two-thirds of the annual sulfur dioxide annual emissions in the United States. Most of the nitrogen oxides (about 50%) are generated from vehicles, buses, trucks and other means of transportation. Approximately 40% of NOx emissions come from power plants. The rest comes from various sources such as industrial and commercial boilers. A nationwide effort to reduce acid pollution was introduced by amendment of the air purification law in 1990. This law aims to reduce acid rain and improve public health by greatly reducing sulfur dioxide (SO 2) and nitrogen oxides (NOx) emissions. It uses market-based capping and trading methods. And it set a permanent upper limit for the total amount of sulfur dioxide that may be emitted by nationwide power plants.

It is well known that acidic deposition or acid rain occurs when sulfur dioxide (SO 2) and nitrogen oxide (NO x) emissions react with atmospheric water, oxygen and oxidizing agents to form various acidic compounds . The prevailing wind can transport these compounds several hundred miles beyond state boundaries and national boundaries. These compounds rain on the earth in dry form (eg gas or granules) or in wet form (eg rain, snow, fog). For details, please refer to EPA's Acid Rain Web site.