Pressurized hot water-assisted recovery of crude residual agar from a never-dried algae industry waste stream: A Box-Behnken design approach

Diop, Cherif Ibrahima Khalil; Trigueros, E.; Sanz, M.B; Beltrán, Sagrario; García–Tojal, Javier

doi:10.1016/j.foodhyd.2022.107664

Cited by 6 publications

(15 citation statements)

References 49 publications

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“…Figure 1 summarizes the process of recovering the remaining agar using a 500 mL discontinuous laboratory-designed stainless-steel pressurized liquid extractor vessel as described elsewhere [ 15 ]. The corresponding volume of double-distilled water was mixed with the relevant dry weight of the never-dried algae waste stream in the extractor to adjust the solid-to-liquid ratio from 3 to 10% ( w:v ).…”

Section: Methodsmentioning

confidence: 99%

“…Martinez-Sanz et al [ 13 ] found that combining sonication and hot water treatments reduced agar extraction time without affecting extraction yield significantly. Pressurized hot water extraction (PHWE) [ 14 ], also known as subcritical water extraction under particular conditions, has rarely been explored [ 15 ]. Subjecting water to high pressures and high temperatures enhances its solvation power while significantly lowering its density and dynamic viscosity [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Whilst pressurized hot water provides a range of benefits, it also shows certain limitations when it comes to extracting thermolabile bioactive compounds [ 14 ]. Controlling PHWE parameters such as the process temperature, pressure, time, and the ratio of algae to water was required to achieve a sustainable extraction process of targeted compounds in the Gelidium sesquipedale industrial waste stream according to Diop et al [ 15 ]. On the other hand, food textures are directly linked to the structure and composition of the material.…”

Section: Introductionmentioning

confidence: 99%

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Adjustable Gel Texture of Recovered Crude Agar Induced by Pressurized Hot Water Treatment of Gelidium sesquipedale Industry Waste Stream: An RSM Analysis

Diop

Beltrán

Jaime

et al. 2022

Foods

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A significant amount of bioactive compound-rich solid waste is released during the industrial phycocolloid-centric extraction of Gelidium sesquipedale. The impact of mild pressurized hot water extraction on repurposing this waste for the recovery of agar with an adjustable gel texture is investigated. A two-factor interaction response surface model assessed the influences of the operating temperatures (80 to 130 °C), times (45 and 150 min), pressures (1 to 70 bar), and algae concentrations (3 to 10% (w:v)). At a temperature of 100 °C, a pressure of 10.13 bar, a recovery time of 45 min, and a 10% algae concentration, the working parameters were considered ideal (w:v). Agar with a hardness of 431.6 g, an adhesiveness of −13.14 g.s−1, a springiness of 0.94, a cohesiveness of 0.63, and a gumminess of 274.46 g was produced under these conditions. A combined desirability of 0.78 was obtained for the exposed technology that retrieved gels with a minimum agar yield of 10% and thermal hysteresis between 39 ± 1 and 52 ± 0.5 °C. The fitted design can provide a high techno-commercial value to the agri-food industrial waste stream.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adjustable Gel Texture of Recovered Crude Agar Induced by Pressurized Hot Water Treatment of Gelidium sesquipedale Industry Waste Stream: An RSM Analysis

Diop

Beltrán

Jaime

et al. 2022

Foods

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“…New extraction techniques are improving the cost-efficiency, sustainability, environmental and industrial-scale feasibility requirements to obtain algal components. New emerging extraction technologies are under development, such as ultrasonication, enzymatic processes, high hydrostatic pressure, microwave-assisted extraction, ultrasound-assisted extraction, radiation, or the use of alternative solvents, such as ionic liquid-based extraction, subcritical water or supercritical fluid extraction with CO 2 , or a combination of several methodologies [26,48,127,162,216,[222][223][224][225].…”

Section: Integrated Approaches and Future Perspectivesmentioning

confidence: 99%

“…However, besides human welfare, there are many new biotechnological seaweeds applications, including in the cosmetics Earth 2022, 3 industry, as a moisturizer, anti-ageing, and UV protector [14][15][16][17], in agriculture, as a biostimulant or biofertilizer [18][19][20][21], and in bioremediation and biosorption, due to the seaweeds' ability to remove contaminants from the surrounding water [22][23][24]. Seaweed extracts are also gaining research interest as a bioplastic product due to the nature of their polymers, producing resistant durable biofilms [25,26]. Another current approach is the use of seaweed waste biomass to produce biofuels (biogas, methane, or bioethanol) since this process does not increase the atmospheric net CO 2 [27,28].…”

Section: Introductionmentioning

confidence: 99%

The Red Seaweed Giant Gelidium (Gelidium corneum) for New Bio-Based Materials in a Circular Economy Framework

Mouga

Fernandes

2022

Earth

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Gelidium corneum (Giant Gelidium or Atlantic agar) is a well-known red seaweed harvested for its high-quality agar content. Agar is a mixture of the polysaccharides used in the food industry as a gelling, thickener, clarifying, and stabilizer agent. The best agar quality is also used in the laboratory as bacteriological agar. Yet, in recent years, the species has been studied for many other applications. Examples of uses are pharmaceuticals, cosmetics, food supplements, bioremediation, biofuels, biofertilizers and biostimulants, biomaterials, and nanocrystals, among others. The use of this biomass, though, raises concerns about the sustainability of the resource, since this is not a cultivated species, being harvested in the wild. Thus, other uses of G. corneum biomass increase pressure on wild stocks already stressed due to climate change. However, in a biorefinery approach, a new trend is emerging, using waste biomass rather than harvested biomass to produce new bio-based materials. These are smart solutions that transform waste into innovative products, useful for various sectors of society while reducing the impact of biomass exploitation. The aim of this review paper, thus, is to address the current state of G. corneum biology, ecology, threats, its current uses and market, and the ongoing research on innovative proposals in a circular economy framework.

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Preparation and Tensile Properties of Citric Acid Crosslinked Poly(vinyl alcohol) films reinforced with Nano‐Alumina

Sinha,

Ullas

2023

Vinyl Additive Technology

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Poly(vinyl alcohol) is widely used in many industrial applications due to its attractive physico‐chemical properties. However, water solubility and limited mechanical strength may sometimes restrict its usage. In the present study, an attempt has been made to improve the mechanical properties of the poly(vinyl alcohol) films, particularly the tensile strength, the percentage elongation and Young's modulus. Poly(vinyl alcohol) films were prepared by solution casting. Citric acid is used as a crosslinker and nano‐alumina (0.1–1% w/w) has been added as reinforcement in the crosslinked matrix. Compared to uncrosslinked films, the films containing citric acid demonstrate an increase of ~10% and ~38% in the tensile strength and modulus, respectively. Nano‐alumina acted as a suitable reinforcement and enhanced the tensile strength and modulus of crosslinked film by ~20% and ~27%, respectively, at 0.3% (w/w) loading. Uncrosslinked film dissolved in distilled water whereas the crosslinked films underwent swelling which reduced with the addition of nano‐alumina. Crosslinked poly(vinyl alcohol) films reinforced with nano‐alumina thus possess superior properties compared to both uncrosslinked and crosslinked films. The crosslinked nanocomposite films could find immense use as a food packaging material or in making membranes for water desalination.Highlights Poly(vinyl alcohol) chemically crosslinked by citric acid. Nano‐alumina added as reinforcement in crosslinked poly(vinyl alcohol) film. Swelling studies conducted on crosslinked nanocomposite films. Tensile testing results showing the supremacy of crosslinked nanocomposite films over uncrosslinked and crosslinked pure film.

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Pressurized hot water-assisted recovery of crude residual agar from a never-dried algae industry waste stream: A Box-Behnken design approach

Cited by 6 publications

References 49 publications

Adjustable Gel Texture of Recovered Crude Agar Induced by Pressurized Hot Water Treatment of Gelidium sesquipedale Industry Waste Stream: An RSM Analysis

Adjustable Gel Texture of Recovered Crude Agar Induced by Pressurized Hot Water Treatment of Gelidium sesquipedale Industry Waste Stream: An RSM Analysis

The Red Seaweed Giant Gelidium (Gelidium corneum) for New Bio-Based Materials in a Circular Economy Framework

Preparation and Tensile Properties of Citric Acid Crosslinked Poly(vinyl alcohol) films reinforced with Nano‐Alumina

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