This study compared the growth, proximate composition, and photosynthesis of Chlorella vulgaris cultures between a compound parabolic concentrator (CPC) coupled to a glass tube and a plain tube without the concentrator. The system with a concentrator increased the irradiance level on the culture by 351% and the average light intensity on cells by 462% compared to the plain tube system. During the exponential growth phase, the growth rate of C. vulgaris was higher in the tube system (1.14 div by day⁻¹) versus the system with a concentrator (0.98 div by day⁻¹), but the cell size was higher in the system with the concentrator (11.23 μm) compared with the tube system (6.28 μm). From day 2 to 4 of culture, biomass production (as organic dry weight: 3.43 to 9.85 pg cell⁻¹) and proximate composition (proteins: 12.13 to 31.36 pg cell⁻¹, lipids: 10.44 to 17.55 pg cell⁻¹, and carbohydrates: 13.04 to 38.38 pg cell⁻¹) were higher in the system with concentrator versus tube system. The biomass productivity (0.07 to 0.37 g L⁻¹) and lipid productivity (1.23 to 5.94 g L⁻¹ day⁻¹) were significantly higher in the tube system in the same period. From a practical perspective, these results emphasize the importance of controlling irradiance in C. vulgaris cultures and suggest that a CPC can be used for microalgae cultures to increase the irradiance and induce stress by light. The CPC system can be used to shift the biochemical composition of microalgae cells toward the production of fine chemicals (e.g., pigments and lipids).

本研究比较了连接到玻璃管的复合抛物线聚光器 (CPC) 和不带聚光器的普通管之间的普通小球藻培养物的生长、近似组成和光合作用。与普通管系统相比，带有聚光器的系统将培养物的辐照度水平提高了 351%，细胞的平均光强度提高了 462%。在指数生长期，C. vulgaris的生长速率在管系统中（1.14 div by day ^-1）高于具有浓缩器的系统（0.98 div by day ^-1)，但与管式系统 (6.28 μm) 相比，带有浓缩器的系统 (11.23 μm) 中的细胞尺寸更大。从培养的第 2 天到第 4 天，生物质产量（作为有机干重：3.43 至 9.85 pg cell ^-1）和近似组成（蛋白质：12.13 至 31.36 pg cell ^-1、脂质：10.44 至 17.55 pg cell ^-1和碳水化合物：13.04 至 38.38 pg 细胞^-1 ) 在具有浓缩器的系统中高于管系统。生物质生产力（0.07 至 0.37 g L ^-1）和脂质生产力（1.23 至 5.94 g L ^-1 天^-1) 在同一时期的管系统中显着更高。从实践的角度来看，这些结果强调了在普通藻培养中控制辐照度的重要性，并表明 CPC 可用于微藻培养以增加辐照度并诱导光胁迫。CPC 系统可用于将微藻细胞的生化成分转变为精细化学品（例如色素和脂质）的生产。