Keywords

Spirulina Platensis, Allophycocyanin, Apoprotein, Antioxidant

Abstract

Spirulina platensis allophycocyanin (APC) was treated with different lighting conditions, different concentrations of sodium dodecyl sulfate (SDS) and urea, and different pH conditions to detect its spectral changes, generation and free radical scavenging capabilities. Changes, the antioxidant activity of purified Spirulina platensis allophycocyanin (APC) under different conditions was studied. The results show that under light, APC has the ability to generate free radicals; in the dark, APC appears to scavenge free radicals. SDS is a strong denaturant. 1mmol/L SDS can completely denature APC and lose its energy transfer function. Under light, APC loses its ability to generate free radicals and its free radical scavenging ability is significantly enhanced. After the action of 1.6 mol/L urea, APC is only partially denatured, resulting in a decrease in APC energy transfer efficiency, which is manifested by a decrease in the ability to generate free radicals under light exposure. As the urea concentration increases (3.2 mol/L, 6.4 mol/L), the structure of APC gradually changes, and the energy transfer function gradually loses, which is manifested in the gradual decrease in the ability to generate free radicals and the gradual increase in the function of scavenging free radicals. APC has a wide pH stability and is very stable in the pH range of 7¨C1.0; when the pH is 1.1, the structure of APC has changed. Under fluorescent lamps, when the pH is 7, APC has the ability to generate free radicals; when the pH is 8, although the fluorescence spectrum of APC does not change, they show the ability to scavenge free radicals. As the pH increases, the free radical scavenging ability also increases. Therefore, APC has the dual function of generating and scavenging free radicals. Light is a key factor in regulating the scavenging and generation of free radicals, and only when APC has the function of energy absorption and transmission, it has the ability to generate free radicals. After the apoprotein is denatured, its ability to scavenge free radicals is enhanced.

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Original research done by Zhou Zhanping, Liu Luning, Chen Xiulan, Zhang Xiying, Zhang Yuzhong, Zhou Baicheng

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