期刊
APPLIED SCIENCES-BASEL
卷 8, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/app8010026
关键词
Spirulina maxima; chlorophyll a; optimization; neuroprotective activities
Under the optimal ultrasonification extraction conditions of 20.52 kHz for the frequency, 32.59 degrees C for the temperature, and 4.91 h for the process time, 17.98 mg/g of chlorophyll a was obtained. It was much higher than 13.81 mg/g from conventional 70% ethanol extraction and even higher than other data from Spirulina. This yield was close to the predicted value of 18.21 mg/g from the second-order polynomial model with a regression coefficient of 0.969. This model showed the greatest significance with the ultrasonic frequency and process time and the least significance with the temperature. The extracts also showed high alpha,alpha-diphenyl-beta-picrylhydrazyl (DPPH) radical scavenging activities as 69.38%, compared to 58.25% for the extracts from the 70% ethanol extraction. It was first shown that the optimal extraction was effective at enhancing the neuroprotective activities possibly due to the synergistic effects of higher amounts of chlorophyll a and other bioactive substances in the extract, revealing a 90% protection of the growth of mouse neuronal cells and a great reduction in Reactive Oxygen Species (ROS) production.
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