CAJ | 학술논문

通过尼罗红荧光染色对一株富油微藻金藻Isochrysis sp. CCMM5001建立和完善了一种方便快捷且能准确定量金藻油脂含量的方法，利用该方法探索了不同培养条件对金藻生长和总脂积累的影响。结果表明：经尼罗红染色后，金藻的单细胞荧光强度与其总脂含量呈良好的线性关系；金藻最适生长的氮浓度、光照强度和温度分别为1323μmol/L、148.0μmol/(m2·s)、25℃；最适总脂积累的氮浓度、光照强度和温度分别为441μmol/L、92.5μmol/(m2·s)、15℃；优化培养条件并采用两阶段培养法后总脂含量和油脂产率都有大幅提高，可分别高达63.3%和22 mg/(L·d)。
통과니라홍형광염색대일주부유미조금조Isochrysis sp. CCMM5001건립화완선료일충방편쾌첩차능준학정량금조유지함량적방법，이용해방법탐색료불동배양조건대금조생장화총지적루적영향。결과표명：경니라홍염색후，금조적단세포형광강도여기총지함량정량호적선성관계；금조최괄생장적담농도、광조강도화온도분별위1323μmol/L、148.0μmol/(m2·s)、25℃；최괄총지적루적담농도、광조강도화온도분별위441μmol/L、92.5μmol/(m2·s)、15℃；우화배양조건병채용량계단배양법후총지함량화유지산솔도유대폭제고，가분별고체63.3%화22 mg/(L·d)。
Some species of microalgae are considered as an ideal resource for biodiesel production because they contain high level of lipids. The traditional method to quantify the lipids level includes the solvent extraction and gravimetric determination based on a chloroform-methanol-water system. This method has the disadvantage of being time consuming and inefficient. Here we used Nile Red, a lipid-soluble fluorescent probe, to establish a novel method to determinate the level of lipids in mi-croalgae rapidly and accurately. We applied the Nile Red method to investigate the dynamic accumulation of lipids in Isochry-sis sp. CCMM5001 under different culture conditions. The results showed that there was a linear correlation between the lipids level and the cellular fluorescence of stained microalgal cells, therefore the former can be accurately indicated by the latter. Low nitrogen concentrations and low temperatures were suitable for accumulating of lipids. The level of lipids was reduced if the illumination intensity was overly high or low. On one hand the optimal conditions for the growth were:N concentration at 1323 μmol/L, illumination intensity at 148.0 μmol/(m2·s), and the temperature at 25℃. On the other hand for the maximal accumulation of the lipids, the optimal values of the parameters above were 441 μmol/L, 92.5 μmol/(m2·s), and 15℃respec-tively. The culture condition was optimized and a two-stage cultivation was carried out to increase both the level and the pro-duction rate of lipids, the former reaching a high concentration of 63.3%and the latter reaching 22 mg/(L·d).