Abstract:
The aim of this study was to compare the growth effect between the spiral type and the straight type of Spirulina platensis cultured under LED red light, LED blue light, and LED white light at pH 10 for 21 days. As a result, it was found that the absorbance of the spiral type of Spirulina platensis cultured under LED red light on day 21 was the highest at 1.573±0.005, while the straight type cultured under LED red light was 1.095±0.003, which was higher than that of the spiral type and straight type cultured under LED white light, which was 0.756±0.008 and 0.746±0.011, respectively. The straight and spiral types cultured under LED blue light showed the highest growth on day 21, which were 0.467±0.009 and 0.356±0.009, respectively. As the result of counting filament, it was found that under red light, the straight types had the highest number of types on day 21, which had 48±4.933 while the spiral types had 31±3.055. which was higher than that of the spiral type and straight type cultured under LED white light, which were 26±2.646 and 21±2.646 The straight and spiral types cultured under LED blue light, which were 17±2.517 and 15±1.528, respectively. According to the result of pigment content analysis, it was found that red light produced more chlorophyll and phycocyanin than blue and white light. While carotenoids were found to be the most abundant in blue light. So, It was concluded that cultivation under red light LEDs was effective in increasing biomass, chlorophyll, and phycocyanin, whereas blue light could increase the supply of alternative carotenoids which was an alternative for the development of the Spirulina platensis cultivation industry.