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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Light-emitting diodes are increasingly used as artificial light sources in Haematococcus pluvialis cultivation due to the fact of their energy advantages. The immobilized cultivation of H. pluvialis in pilot-scale angled twin-layer porous substrate photobioreactors (TL-PSBRs) was initially performed with a 14/10 h light/dark cycle and showed relatively low biomass growth and astaxanthin accumulation. In this study, the illumination time with red and blue LEDs at a light intensity of 120 µmol photons m−2 s−1 was increased to 16–24 h per day. With a light/dark cycle of 22/2 h, the biomass productivity of the algae was 7.5 g m−2 day−1, 2.4 times higher than in the 14/10 h cycle. The percentage of astaxanthin in the dry biomass was 2%, and the total amount of astaxanthin was 1.7 g m−2. Along with the increase in light duration, adding 10 or 20 mM NaHCO3 to the BG11-H culture medium over ten days of cultivation in angled TL-PSBRs did not increase the total amount of astaxanthin compared with only CO2 addition at a flow rate of 3.6 mg min−1 to the culture medium. Adding NaHCO3 with a 30–80 mM concentration inhibited algal growth and astaxanthin accumulation. However, adding 10–40 mM NaHCO3 caused algal cells to accumulate astaxanthin at a high percentage in dry weight after the first four days in TL-PSBRs.

Details

Title
Effect of LED Illumination Cycle and Carbon Sources on Biofilms of Haematococcus pluvialis in Pilot-Scale Angled Twin-Layer Porous Substrate Photobioreactors
Author
Thanh-Tri Do 1   VIAFID ORCID Logo  ; Quach-Van, Toan-Em 2 ; Thanh-Cong Nguyen 3 ; Pau Loke Show 4   VIAFID ORCID Logo  ; Nguyen, Tran Minh-Ly 5 ; Huynh, Duc-Hoan 6 ; Dai-Long, Tran 7 ; Melkonian, Michael 8 ; Hoang-Dung Tran 9   VIAFID ORCID Logo 

 Faculty of Biology-Biotechnology, University of Science, Vietnam National University Ho Chi Minh City, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 72711, Vietnam; [email protected]; Faculty of Biology, Ho Chi Minh City University of Education, 280 An Duong Vuong Street, District 5, Ho Chi Minh City 72711, Vietnam 
 Faculty of Biology, Ho Chi Minh City University of Education, 280 An Duong Vuong Street, District 5, Ho Chi Minh City 72711, Vietnam 
 Faculty of Biotechnology, Nguyen-Tat-Thanh University, 298A-300A Nguyen-Tat-Thanh Street, District 4, Ho Chi Minh City 72812, Vietnam 
 Department of Chemical Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates; [email protected] 
 Faculty of Business Administration, TU Bergakademie Freiberg, Akademiestraße 6, 09599 Freiberg, Germany; [email protected] 
 Can Gio Protection Forest Management Board, 1541 Rung Sat Street, An Thoi Dong Commune, Can Gio District, Ho Chi Minh City 73311, Vietnam 
 Department of Supervisor Inspector, Van Lang University, Nguyen Khac Nhu Street, Co Giang Ward, District 1, Ho Chi Minh City 71013, Vietnam 
 Department of Plant-Microbe Interactions, Integrative Bioinformatics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany; Central Collection of Algal Cultures (CCAC), Faculty of Biology, University of Duisburg-Essen, 45117 Essen, Germany 
 Faculty of Biology and Environment, Ho Chi Minh City University of Food Industry, 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City 72009, Vietnam 
First page
596
Publication year
2023
Publication date
2023
Publisher
MDPI AG
e-ISSN
23065354
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2819344493
Copyright
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.