An overview of extraction and purification techniques of seaweed dietary fibers for immunomodulation on gut microbiota

Praveen, M. Ajanth; Parvathy, K.; Balasubramanian, P.; Jayabalan, R.

doi:10.1016/j.tifs.2019.08.011

Cited by 97 publications

(84 citation statements)

References 175 publications

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“…Vast structural variation between the APS therefore presents a challenge in terms of pre-treatments application, extraction techniques and optimization, characterization of isolated fractions and determination of their biological properties.Chemical structure and yield of APS isolated from marine macroalgae by conventional extraction (CE) techniques can be affected by various experimental conditions (pH, time, temperature, pressure, particle size, solvent, sample to solvent ratio, agitation speed etc.). In addition, different advanced techniques such as microwave assisted extraction (MAE), ultrasound assisted extraction (UAE), pressurized liquid extraction (PLE), enzyme-assisted extractions (EAE) are assessed and applied for APS extraction [9][10][11].In general, the chemical structure of polysaccharides determines its physical, chemical and biochemical properties as well as its biological activities [12]. Several studies have reported that their biological activity is strongly associated with their chemical structure [9].…”

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confidence: 99%

“…Hence, this review presents an overview of conventional and advanced extraction techniques of marine brown APS in the latest researches done in this field. Compared to some other review articles [3,11,13] that covered similar topics, more focus is given on extraction techniques and parameters, and their influence on structural properties and biological activity of the extracted polysaccharides. Furthermore, commercial application of APS from the most current literature is also discussed.…”

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confidence: 99%

“…Chemical structure and yield of APS isolated from marine macroalgae by conventional extraction (CE) techniques can be affected by various experimental conditions (pH, time, temperature, pressure, particle size, solvent, sample to solvent ratio, agitation speed etc.). In addition, different advanced techniques such as microwave assisted extraction (MAE), ultrasound assisted extraction (UAE), pressurized liquid extraction (PLE), enzyme-assisted extractions (EAE) are assessed and applied for APS extraction [9][10][11].…”

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Advanced Technologies for the Extraction of Marine Brown Algal Polysaccharides

et al. 2020

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Over the years, brown algae bioactive polysaccharides laminarin, alginate and fucoidan have been isolated and used in functional foods, cosmeceutical and pharmaceutical industries. The extraction process of these polysaccharides includes several complex and time-consuming steps and the correct adjustment of extraction parameters (e.g., time, temperature, power, pressure, solvent and sample to solvent ratio) greatly influences the yield, physical, chemical and biochemical properties as well as their biological activities. This review includes the most recent conventional procedures for brown algae polysaccharides extraction along with advanced extraction techniques (microwave-assisted extraction, ultrasound assisted extraction, pressurized liquid extraction and enzymes assisted extraction) which can effectively improve extraction process. The influence of these extraction techniques and their individual parameters on yield, chemical structure and biological activities from the most current literature is discussed, along with their potential for commercial applications as bioactive compounds and drug delivery systems.(APS) is determined by algae species however it is also influenced by other factors causing inter-species variation, e.g., growth location and harvesting season [8]. Vast structural variation between the APS therefore presents a challenge in terms of pre-treatments application, extraction techniques and optimization, characterization of isolated fractions and determination of their biological properties.Chemical structure and yield of APS isolated from marine macroalgae by conventional extraction (CE) techniques can be affected by various experimental conditions (pH, time, temperature, pressure, particle size, solvent, sample to solvent ratio, agitation speed etc.). In addition, different advanced techniques such as microwave assisted extraction (MAE), ultrasound assisted extraction (UAE), pressurized liquid extraction (PLE), enzyme-assisted extractions (EAE) are assessed and applied for APS extraction [9][10][11].In general, the chemical structure of polysaccharides determines its physical, chemical and biochemical properties as well as its biological activities [12]. Several studies have reported that their biological activity is strongly associated with their chemical structure [9]. Due to very complex mechanisms that are affected by many factors, the correlation between polysaccharide structure and biological activity is still not sufficiently clarified.In order to improve isolation of APS, pre-treatments are usually applied to the algal biomass prior to the extraction process with the two aims: (i) to prevent co-extraction of interfering bioactive compounds with similar solubility; and (ii) to disrupt cell walls and improve mass transfer of APS into extraction solvent. The first type of pre-treatments is therefore used to remove compounds which are highly bound to the APS such as proteins, phenols and lipids, as well as mannitol and chlorophyll [13]. For that purpose, the application of various pr...

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Advanced Technologies for the Extraction of Marine Brown Algal Polysaccharides

et al. 2020

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“…Generally, seaweeds have a really high water content (70-90% fresh weight) and are mostly composed by carbohydrates (25-77% dry matter basis, dry matter), followed by proteins (5-43% dry matter), minerals (with an ash content of 9-50% dry matter) and lipids (1-5% dry matter) (Jung et al, 2013;Offei et al, 2018;Praveen et al, 2019). The main carbohydrates found in seaweed are cellulose, starch, sucrose, ulvan, carrageenan, agar, laminarin, mannitol, alginate, fucoidan.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Their photosynthetic pigments are essentially chlorophyll A and B, and carotenoids (Jung et al, 2013;Sudhakar et al, 2018). Moreover, green algae carbohydrate content varies between 40 and 60% dry matter, and it mainly consists of polysaccharides as ulvan, starch and cellulose (Michalak, 2018;Praveen et al, 2019). Ulvan is mainly composed by α-and β-(1,4)-linked units of rhamnose, xylose, galactose, glucuronic acid and iduronic acid and several repeating disaccharides (such as β-D-glucuronic acid (1,4)-linked to α-L-rhamnose 3-sulfate) (Kidgell et al, 2019), while both starch and cellulose are composed by glucose units, but with different spatial configurations.…”

Section: Green Seaweedsmentioning

confidence: 99%

Recent trends on seaweed fractionation for liquid biofuels production

Río

Gomes-Dias

Rocha

et al. 2020

Bioresource Technology

103

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Concerns about fossil fuels depletion has led to seek for new sources of energy. The use of marine biomass (seaweed) to produce biofuels presents widely recognized advantages over terrestrial biomasses such as higher production ratio, higher photosynthetic efficiency or carbon-neutral emissions. In here, interesting seaweed sources as a whole or as a residue from seaweed processing industries for biofuel production were identified and their diverse composition and availability compiled. In addition, the pretreatments used for seaweed fractionation were thoroughly revised as this step is pivotal in a seaweed biorefinery for integral biomass valorization and for enabling biomass-to-biofuel economic feasibility processes. Traditional and emerging technologies were revised, with particular emphasis on green technologies, relating pretreatment not only with the type of biomass but also with the final target product(s) and yields. Current hurdles of marine biomass-to-biofuel processes were pinpointed and discussed and future perspectives on the development of these processes given.

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