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20. Contributors

Author

Alvarenga, Ana Gabrielle Pires, primary, Ashokkumar, Veeramuthu, additional, Chang, Jo-Shu, additional, Chen, Chun-Yen, additional, Cho, Dae-Hyun, additional, Costa, Jorge Alberto Vieira, additional, Daaman, J. Dhanish, additional, da Rosa, Gabriel Martins, additional, Deepika, N., additional, de Morais, Michele Greque, additional, Dharmaraja, Jeyaprakash, additional, Dropathi, Meghana Reddy, additional, Huy, Menghour, additional, Joun, Jaemin, additional, Kim, Hee-Sik, additional, Kumar, Gopalakrishnan, additional, Kuntzler, Suelen Goettems, additional, Lee, Duu-Jong, additional, Leong, Yoong Kit, additional, Li, Yameng, additional, Marella, Thomas Kiran, additional, Nagarajan, Dillirani, additional, Pandey, Ashok, additional, Peng, Ruibing, additional, Pires, José C.M., additional, Reddy, S. Deepak Mohan, additional, Reddy, C. Nagendranatha, additional, Salgado, Eva M., additional, Shobana, Sutha, additional, Sim, Sang Jun, additional, Sirohi, Ranjna, additional, Sung, Young Joon, additional, Tiwari, Archana, additional, Vatland, Ann Kristin, additional, Vishwanutha, S., additional, Wu, Yi, additional, Yadavalli, Rajasri, additional, Yu, Byung Sun, additional, Yun, Jin-Ho, additional, Zhang, Congying, additional, Zhang, Quanguo, additional, Zhang, Zhiping, additional, and Zhang, Huan, additional

Published
2023
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21. Contributors

Author

Ang, Zhi Ting, primary, Arshad, Zatul Iffah Mohd, additional, Aung, Krisya Nicole Garcia, additional, Bong, Kien Xiang, additional, Chai, Sophie Jing Nee, additional, Chai, Wai Siong, additional, Chang, Chih-Kai, additional, Cheah, Wai Yan, additional, Cheng, Chin Kui, additional, Rong Chew, Kah, additional, Chew, Kit Wayne, additional, Chia, Shir Reen, additional, Chia, Wen Yi, additional, Chong, Jun Wei Roy, additional, Devadas, Vishno Vardhan, additional, Duc, Nguyen Minh, additional, Fu, Xiao-Qian, additional, Hong, Teoh Rui, additional, Khoo, Kuan Shiong, additional, Koyande, Apurav Krishna, additional, Kuan, Wang Sze, additional, Lai, Shuet Fen, additional, Leong, Hui Yi, additional, Leong, Yoong Kit, additional, Lin, Dong-Qiang, additional, Liu, Xuwei, additional, Loo, Jia Rhen, additional, Shin Low, Sze, additional, Chee Lu, Hock, additional, Sie Ming, Jasmine Tiong, additional, Ng, Yan Jer, additional, Nomanbhay, Saifuddin, additional, Quah, Heam Boon, additional, Raguraman, Sridaran, additional, Sankaran, Revathy, additional, Show, Pau Loke, additional, Siau, Mei Yuen, additional, Tang, Malcom S.Y., additional, and Wan You, Kho, additional

Published
2023
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32. Extraction and purification of green polymers using aqueous two-phase extraction (ATPE)

Author

Leong, Yoong Kit

Subjects
668.9, TP Chemical technology
Abstract

Due to the increasing concern towards depleting petroleum resource and pollutions done by conventional plastics, polyhydroxyalkanoates (PHAs) which have diverse structure variability and rapid biodegradation have gained increasing attentions as potential replacement for plastics. However, PHAs have a much higher production cost compared to that of conventional plastics due to expensive carbon source and downstream processing. Aqueous two-phase extraction (ATPE) outshines other PHAs purification techniques by having the advantages of providing a mild environment for bioseparation, being green and non-toxic, and easily scaled-up. Henceforth, this research aimed to study on the purification and recovery of PHAs using thermoseparation-based ATPE. Firstly, cloud point extraction technique which based on thermoseparating polymers (TSP)/water two phase system was employed. The recovery yield of 94.8 % and purification factor (PF) of 1.41 fold was achieved under the conditions of 20 wt/wt % ethylene oxide-propylene oxide (EOPO) with 3900 g/mol MW and 10 mM of NaCl addition at thermoseparating temperature of 60 °C. TSPs have also been coupled with ammonium sulfate to form a two-phase system. Under the condition of 14 wt/wt % of both EOPO 3900 and (NH4)2SO4 at pH 6, yield and purity up to 72 % and 60 % can be achieved. Without the need of additional TSPs top-up, recycling and reutilization of phase-forming polymers can be done at least twice with satisfying yield and PF. Using two-level full factorial design, the statistical analysis demonstrated that the phosphate and thermoseparating polymer concentration are the most significant parameters due to their individual influence and synergistic interaction between them on all response variables. Utilizing the two significant parameters, the purification and recovery of PHAs were further optimized using central composite design and achieved recovery yield as high as 99.9 %. The optimum PF of 1.431 fold was obtained at 17.12 wt/wt % of phosphate salts and 18.52 wt/wt % of EOPO 3900. Using the addition of fresh phase-forming components, a total of 4 successive purification cycles with satisfying yield and PF were demonstrated. Utilizing the carbon source screened by the preliminary integrated economic and environmental assessment developed, the feasibility of extractive bioconversion of PHAs under the influence of different parameters was studied. The strategy successfully achieved a yield and PF of 97.6 % and 1.36 fold respectively under the condition of 5 wt/wt % EOPO 3900 concentration, 30 °C fermentation temperature and pH 6. The scaling-up to 2 L bioreactor proved that the scale-up of ATPE can be predicted reliably from laboratory-scale experimental data. In the final section, the evaluation of economic and environmental performance of two processes (which are with and without thermoseparating ATPE as primary purification step) were performed. With the basis of 9,000 tons PHAs production per year and 7,920 operating hours, the process with thermoseparating ATPE as primary purification step standout in terms of both economic and environmental performance. PHA production cost of 5.77 US$/kg with a payback period of fewer than 4 years and ROI of 25.2 % was achieved. The research proved that thermoseparating ATPE is a powerful and potential technique for PHAs purification and recovery as the technique showed a much higher PHAs recovery yield (approximately 2 times) in comparison with the literature (Divyashree and Shamala, 2010). In conclusion, this opens promising standpoints for utilizing thermoseparating ATPE as the primary step in the isolation and purification of PHAs from fermented broth.

Published
2018

34. Assessing the Efficacy of Cyanobacterial Strains as Oryza sativa Growth Biostimulants in Saline Environments.

Author

Bauenova, Meruyert O., Sarsekeyeva, Fariza K., Sadvakasova, Asemgul K., Kossalbayev, Bekzhan D., Mammadov, Ramazan, Token, Aziza I., Balouch, Huma, Pashkovskiy, Pavel, Leong, Yoong Kit, Chang, Jo-Shu, and Allakhverdiev, Suleyman I.

Subjects
SALT tolerance in plants, EFFECT of salt on plants, SPIRULINA platensis, SUSTAINABILITY, SUSTAINABLE agriculture
Abstract

Soil salinity, which affects plant photosynthesis mechanisms, significantly limits plant productivity. Soil microorganisms, including cyanobacteria, can synthesize various exometabolites that contribute to plant growth and development in several ways. These microorganisms can increase plant tolerance to salt stress by secreting various phytoprotectants; therefore, it is highly relevant to study soil microorganisms adapted to high salinity and investigate their potential to increase plant resistance to salt stress. This study evaluated the antioxidant activity of four cyanobacterial strains: Spirulina platensis Calu-532, Nostoc sp. J-14, Trichormus variabilis K-31, and Oscillatoria brevis SH-12. Among these, Nostoc sp. J-14 presented the highest antioxidant activity. Their growth-stimulating effects under saline conditions were also assessed under laboratory conditions. These results indicate that Nostoc sp. J-14 and T. variabilis K-31 show significant promise in mitigating the harmful effects of salinity on plant size and weight. Both strains notably enhanced the growth of Oryza sativa plants under saline conditions, suggesting their potential as biostimulants to improve crop productivity in saline environments. This research underscores the importance of understanding the mechanisms by which cyanobacteria increase plant tolerance to salt stress, paving the way for sustainable agricultural practices in saline areas. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Contributors

Author

Bo, Yahui, primary, Bui, Xuan Thanh, additional, Cassuriaga, Ana Paula Aguiar, additional, Chaiwong, Chawalit, additional, Chang, Chien-Hsiang, additional, Chang, Jo-Shu, additional, Chaudhary, Anchal, additional, Chen, Yen-Po, additional, Chen, Zhijie, additional, Chen, Zhuo, additional, Cheng, Pengfei, additional, Costa, Jorge Alberto Vieira, additional, Cruz, Camila Gonzales, additional, Dan Nguyen, Phuoc, additional, Deng, Lijuan, additional, Feng, Yanzhang, additional, Gentile, Carmine, additional, Guo, Wenshan, additional, Iqbal, Khushboo, additional, Johnson, Inigo, additional, Koottatep, Thammarat, additional, Kumar, Mathava, additional, Leong, Yoong Kit, additional, Lin, Yu-Chen, additional, Liu, Wei, additional, McCauley, Janice I., additional, Mishra, Arti, additional, Mohammed, Johir A.H., additional, Moraes, Luiza, additional, Morais, Michele Greque, additional, Nghiem, Long D., additional, Ngo, Huu Hao, additional, Nguyen, Luong N., additional, Nguyen, Thi Minh Hong, additional, Nguyen, Thanh Tin, additional, Nguyen, Thu Thuy, additional, Nguyen, Dinh Duc, additional, Nguyen, Thi Thuy Nga, additional, Nguyen, Thi An Hang, additional, Nguyen, Manh Khai, additional, Ni, Bing-Jie, additional, Ortega, Javiera S., additional, Pandey, Ashok, additional, Pathak, Nirenkumar, additional, Pen, Yu, additional, Ralph, Peter J., additional, Ruan, Roger, additional, Sharma, Sandhya, additional, Thakur, Indu Shekhar, additional, Varjani, Sunita, additional, Varma, Ajit, additional, Vo, Hoang Nhat Phong, additional, Vu, Minh T., additional, Vu, Hang P., additional, Wang, Chun, additional, Wang, Guangce, additional, Wang, Dan, additional, Wei, Wei, additional, Xu, Baoyu, additional, Yan, Xiaojun, additional, Yang, Chen-Ying, additional, Yu, Hsin-Ying, additional, Zdarta, Jakub, additional, Zheng, Lei, additional, and Zhou, Chengxu, additional

Published
2022
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47. Contributors

Author

Abbas, Mohammad Ameer, primary, Cheah, Chor Hoong, additional, Cheng, Sze Yin, additional, Chew, Kit Wayne, additional, Chia, Shir Reen, additional, Fernandez, Natalie, additional, Irfahn, Saajit, additional, Khoo, Kuan Shiong, additional, Khoo, Zhi Sheng, additional, Kow, Kai Xin, additional, Koyande, Apurav Krishna, additional, Lee, Veronica Shi Shien, additional, Lee, Sze Ying, additional, Leong, Yoong Kit, additional, Lim, Albert Fu Xian, additional, Lim, Esther Hui Xian, additional, Ling, Tau Chuan, additional, Mistry, Bijal, additional, Narenthra Rao, Kaoshilya Bai, additional, Remana, Harishma P., additional, Sankaran, Revathy, additional, Selva Kumaran, Nhavin Adrian Raj, additional, Show, Pau Loke, additional, Tan, Kin Loong, additional, Yew, Guo Yong, additional, Yu, Kai Ling, additional, and Yusof, Hanna, additional

Published
2021
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