Effects of nitrogen fertilizer on the growth, chemical composition and antioxidant activity of Chara corallina
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Abstract
The results showed nitrogen (N) fertilization can increase the growth performance, total chlorophyll, protein content, lysine, threonine, aspatatic acid, glutamic acid, arginine, phenolic content of Chara corallina. The alga in four treatments showed significant on chlorophyll, crude protein, amino acid profile. Most of the biochemical compositions in C. corallina increased significantly with the increased concentrations of nitrogen. The increasing nitrogen content in the culture system did not affect the phytochemical content of C. corallina, because nitrogen is not an essential element in the structure of phenolic, flavonoid and tannin compounds. Urea supplementation enhanced non-essential amino acids associated with flavor, particularly Glutamic acid and Aspartic acid, with the highest levels observed at 0.10 mg/L urea supplement, improving the nutritional and sensory quality of C. corallina. Additionally, nitrogen enrichment increased the antioxidant activity, likely due to elevated chlorophyll content. These findings suggested that optimizing nitrogen supply in algal cultivation can simultaneously enhance both the nutritional value and bioactive properties of C. corallina.
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