Bio-processing of algal bio-refinery: a review on current advances and future perspectives

Koyande, Apurav Krishna; Show, Pau Loke; Guo, Ruixin; Tang, Bencan; Ogino, Chiaki; Chang, Jo‐Shu

doi:10.1080/21655979.2019.1679697

Cited by 122 publications

(59 citation statements)

References 148 publications

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“…In addition, microalgae do not compete with food crop production or available farmland. They can be cultivated on non-arable land with wastewater or reject water, saline/brackish water and even sewage as a medium 3,5 .…”

Section: Introductionmentioning

confidence: 99%

Total Lipids Content, Lipid Class and Fatty Acid Composition of Ten Species of Microalgae

Yang

Hosokawa

et al. 2020

J. Oleo Sci.

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valuable bioresources 6, 7. Microalgae produce a wide range of valuable compounds such as polysaccharides, lipids, proteins, enzymes, vitamins and pigments 8, 9. During the process of photosynthesis, microalgae can store nonpolar lipids like triacylglycerol TAG in the cells 3. Especially, oleaginous microalgae sometimes produce intracellular oils above 20 of their dry weight that can be converted into biodiesel 9. Some of them have the ability to accumulate Abstract: Microalgae is a potential producer of functional lipids such as n-3 polyunsaturated fatty acids (PUFA) and fucoxanthin. In the present study, lipids from ten microalgae species were analyzed especially focusing on the fucoxanthin, lipid and fatty acid compositions. The study revealed a remarkable variation in total lipids content, fucoxanthin content, lipid class composition and n-3 PUFA content in individual species, although they belong to the same genus. Among microalgae examined, Pavlova lutheri contained the highest total lipids content (313.59 mg g-1 dry weight) and considerable amount of fucoxanthin (3.13 mg g-1 dry weight). It also had the highest level (28.01%) of total n-3 PUFA with high level of eicosapentaenoic acid (EPA) (17.76%) and docosahexaenoic acid (DHA) (7.61%). The highest fucoxanthin content (5.19 mg g-1 dry weight) was observed in Chaetoceros gracilis. C. gracilis also contained relatively high level of total lipids (228.87 mg g-1 dry weight) and 10.67% EPA. The results also demonstrated that Nannochloropsis oculata contained the greatest amount of EPA (26.21%), while Isochrysis galbana had the highest level of DHA (8.76%). And both microalgae contained 1.71 and 4.44 mg g-1 dry weight fucoxanthin, respectively. Microalgal lipids containing abundant fucoxanthin and n-3 PUFA such as EPA and DHA in the present study will be used as nutraceutical lipids with great commercial potential.

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Section: Introductionmentioning

confidence: 99%

Total Lipids Content, Lipid Class and Fatty Acid Composition of Ten Species of Microalgae

Yang

Hosokawa

et al. 2020

J. Oleo Sci.

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“…Microalgae have the key advantage to produce third generation biofuel, because of its rapid growth and high lipid contents (Shuba and Kifle, 2018;Koyande et al, 2019). In comparison to petroleum diesel, biodiesel is characterized by lower emissions of carbon dioxide, sulfur dioxide, and harmful air pollutants.…”

Section: Algae-based Bioconversionsmentioning

confidence: 99%

Valorization of Seafood Processing Discards: Bioconversion and Bio-Refinery Approaches

Venugopal

2021

Front. Sustain. Food Syst.

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The seafood industry generates large volumes of waste. These include processing discards consisting of shell, head, bones intestine, fin, skin, voluminous amounts of wastewater discharged as effluents, and low-value under-utilized fish, which are caught as by-catch of commercial fishing operations. The discards, effluents, and by-catch are rich in nutrients including proteins, amino acids, lipids containing good proportions of polyunsaturated fatty acids (PUFA), carotenoids, and minerals. The seafood waste is, therefore, responsible for loss of nutrients and serious environmental hazards. It is important that the waste is subjected to secondary processing and valorization to address the problems. Although chemical processes are available for waste treatment, most of these processes have inherent weaknesses. Biological treatments, however, are environmentally friendly, safe, and cost-effective. Biological treatments are based on bioconversion processes, which help with the recovery of valuable ingredients from by-catch, processing discards, and effluents, without losing their inherent bioactivities. Major bioconversion processes make use of microbial fermentations or actions of exogenously added enzymes on the waste components. Recent developments in algal biotechnology offer novel processes for biotransformation of nutrients as single cell proteins, which can be used as feedstock for the recovery of valuable ingredients and also biofuel. Bioconversion options in conjunction with a bio-refinery approach have potential for eco-friendly and economical management of seafood waste that can support sustainable seafood production.

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“…Table 3 outlines the annual biodiesel production, yield, and land required for different source types [55]. High biofuel yield and low land requirement of microalgae point towards the positive usage of microalgae as biofuel producer.…”

Section: Microalgae Cultivation In Pome and Benefits Of Treating Pome With Microalgaementioning

confidence: 99%

Microalgae Cultivation in Palm Oil Mill Effluent (POME) Treatment and Biofuel Production

et al. 2021

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Palm oil mill effluent (POME) is the wastewater produced during the palm oil sterilization process, which contains substantial amounts of nutrients and phosphorous that are harmful to the environment. High BOD and COD of POME are as high as 100,000 mg/L, which endanger the environment. Effective pre-treatment of POME is required before disposal. As microalgae have the ability of biosorption on nutrients and phosphorous to perform photosynthesis, they can be utilized as a sustainable POME treatment operation, which contributes to effective biofuel production. Microalgae species C. pyrenoidosa has shown to achieve 68% lipid production along with 71% nutrient reduction in POME. In this study, a brief discussion about the impacts of POME that will affect the environment is presented. Additionally, the potential of microalgae in treating POME is evaluated along with its benefits. Furthermore, the condition of microalgae growth in the POME is also assessed to study the suitable condition for microalgae to be cultivated in. Moreover, experimental studies on characteristics and performance of microalgae are being evaluated for their feasibility. One of the profitable applications of POME treatment using microalgae is biofuel production, which will be discussed in this review. However, with the advantages brought from cultivating microalgae in POME, there are also some concerns, as microalgae will cause pollution if they are not handled well, as discussed in the last section of this paper.

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Bio-processing of algal bio-refinery: a review on current advances and future perspectives

Cited by 122 publications

References 148 publications

Total Lipids Content, Lipid Class and Fatty Acid Composition of Ten Species of Microalgae

Total Lipids Content, Lipid Class and Fatty Acid Composition of Ten Species of Microalgae

Valorization of Seafood Processing Discards: Bioconversion and Bio-Refinery Approaches

Microalgae Cultivation in Palm Oil Mill Effluent (POME) Treatment and Biofuel Production

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