

FOLLOWUS
1.College of Environmental Science & Engineering, Yangzhou University, Yangzhou 225009, China
2.Marine Science & Technology Institute, Yangzhou University, Yangzhou 225009, China
zhouxiaojian@yzu.edu.cn
Received:26 April 2022,
Accepted:27 May 2022,
Online First:30 June 2022,
Published:01 September 2023
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JIN Cuili,DONG Miaoping,ZHANG Yi,et al.Improvement in lipid production and biodiesel quality of Pavlova sp. by monochromatic illumination[J].Journal of Oceanology and Limnology,2023,41(05):1864-1875.
Pavlova
sp. is not only one of the most popular microalgae in aquaculture
but also a source of high-quality biodiesel feedstock. With white light as a control (W)
Pavlova
sp. was cultured in this study under varying light quality
including monochromatic red light (R)
blue light (B)
and combinations thereof with different proportions (illuminators of
m
R
n
B
comprised of
m
red light units and
n
blue ones
m
+
n
=7)
to examine the effects of illuminating light quality on biocomponent production and biodiesel quality. The results show that combined monochromatic light
especially 2R5B
3R4B
4R3B
and 5R2B
could improve the growth of
Pavlova
sp. The dry weight of harvested algae powder in the 5R2B group reached 418.03 mg/L
and was 22.65% higher than that in the control group (W). Lipid production under combined monochromatic light of 4R3B reached 107.86 mg/L
and was 25.61% higher than in the control (W). In addition
illumination using 4R3B increased the proportion of C16∶0 (palmitic acid) and C16꞉1 (palmitoleic acid) fatty acids in
Pavlova
sp. by 15.55% and 21.94%
respectively
which translates into improved biodiesel quality. All cetane numbers (CN) for 4R3B–6R1B were over 51
while iodine values (IV) and degrees of unsaturation (DU) were reduced
leading to more stable biodiesel suitable for long-term storage. In addition
protein production under 6R1B was as high as 31.56 mg/L
1.8 times greater than under W. Light quality is proposed as an effective tool to regulate biocomponen
t production by microalgae.
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