Crabs Marine Waste—A Valuable Source of Chitosan: Tuning Chitosan Properties by Chitin Extraction Optimization

Gîjiu, Cristiana Luminița; Isopescu, Raluca; Dinculescu, Daniel; Memecică, Maria; Apetroaei, Manuela-Rossemary; Anton, Mirela; Schröder, Verginica; Rău, Ileana

doi:10.3390/polym14214492

Cited by 16 publications

(7 citation statements)

References 44 publications

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“…Ge et al [35] developed a porous material prepared from crab shell waste for effective removal of aqueous Cu(II) pollution, while Yang et al [36] explored the recycling potential of crab shell waste into reinforced poly(lactic acid) biocomposites for 3D printing. Moreover, Gîjiu et al [37] demonstrated that marine crab waste is a valuable source of chitosan, while Vijayalakshmi and Ranjitha [38] used crab shells for biodiesel production as a way to promote circular economy. Sebestyén et al [39] investigated the thermal degradation of crab shell biomass, providing relevant information for its application in pyrolysis processes.…”

Section: Refs Key Resultsmentioning

confidence: 99%

Circular Economy in Guaiamum and Uçá Crab Waste in Brazil: Potential By-Products—A Systematic Literature Review

Filho,

Gaspar,

Souza

et al. 2024

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This study aimed to fill a gap in the sustainable management of the reverse supply chain of Guaiamum and Uçá crab waste in Brazil, an endangered species. The study focused on the circular economy, governance, and recent developments, and identified circular economy practices in the utilization of solid waste from the fishing and collection of these species in extractive regions, in line with the United Nations (UN) Sustainable Development Goals (SDGs). A systematic literature review was conducted in major scientific databases. The selection of the 20 research publications followed pre-established criteria, including relevance to the SDGs and systematic review methodology. The results highlighted key variables related to the characteristics of by-products and the factors that influence the adoption of circular economy practices, in line with relevant SDGs. The most mentioned by-products include animal feed, organic fertilizer, biofuels, crab shell chitin biocomposite derivatives, as well as Chitosan-based composites for food packaging applications due to their non-toxicity, antimicrobial, and antifungal properties. The study also identified future research opportunities covering education, policy, and management, in line with the UN SDGs. This study emphasizes the importance of the circular economy for solid crab waste in Brazil, a country with 12% of the world’s mangroves, which are essential both as a nursery for crabs and for ocean nutrition. It also analyzes current trends and initiatives in the reverse management of Guaiamum and Uçá crab waste, in the context of Supply Chain and Sustainable Management.

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Section: Refs Key Resultsmentioning

confidence: 99%

Circular Economy in Guaiamum and Uçá Crab Waste in Brazil: Potential By-Products—A Systematic Literature Review

Filho,

Gaspar,

Souza

et al. 2024

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“…The viscosimetric method was used for chitosan (M v ) average molar mass (g/mol) measuring by following a method described in our previous studies by Pădurețu et al (2019) [ 22 ] and Gîjiu et al (2022) [ 26 ]; Mark–Houwink–Sakurada Equation (3) was used for this purpose, based on the intrinsic viscosity value (η) measured (mL/g), where K (13.8 × 10 −3 mL/g) and α (0.85) are constants that depend on the nature of the solvent, temperature, and chemical structure of the polymer [ 22 , 27 ]:

…”

Section: Methodsmentioning

confidence: 99%

“…The fourth step consists in the deacetylation process and leads to the chitosan obtaining. Chitin extraction from shrimp exoskeletons was carried out following the method described in our previous study [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Simultaneous Optimization of Deacetylation Degree and Molar Mass of Chitosan from Shrimp Waste

Dinculescu,

Apetroaei,

Gîjiu

et al. 2024

Polymers

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Shrimp waste is a valuable source for chitin extraction and consequently for chitosan preparation. In the process of obtaining chitosan, a determining step is the chitin deacetylation. The main characteristic of chitosan is the degree of deacetylation, which must be as high as possible. The molar mass is another important parameter that defines its utilizations, and according to these, high or low molar masses are required. The present study is an attempt to optimize the deacetylation step to obtain chitosan with a high degree of deacetylation and high or low molar mass. The study was carried out based on experimental data obtained in the frame of a central composite design where three working parameters were considered: NaOH concentration, liquid:solid ratio, and process duration. The regression models defined for the degree of deacetylation (DD) and for the mean molar mass (MM) of chitosan powders were used in the formulation of optimization problems. The objectives considered were simultaneous maximum DD and maximum/minimum MM for the final chitosan samples. For these purposes, multiobjective optimization problems were formulated and solved using genetic algorithms implemented in Matlab®. The multiple optimal solutions represented by trade-offs between the two objectives are presented for each case.

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“…Chitin is the second-largest natural polysaccharide after cellulose, and its exploitation and utilization is limited because it is insoluble in common solvents [1, 2]. However, traditional physical and chemical treatment methods can no longer meet the increasing demands for environmental protection and benefits, due to their drawbacks such as high energy consumption, environmental pollution, extensive use of strong acids and bases, and difficulty in controlling the structure of products [3–6]. As a result, greener and more efficient biodegradation has emerged as a new hotspot in the development of chitin resources [7, 8].…”

Section: Introductionmentioning

confidence: 99%

Streptomyces fuscus sp. nov., a brown-black pigment producing actinomycete isolated from dry mudflat sand

Xie,

Zhang,

et al. 2023

International Journal of Systematic and Evolutionary Microbiology

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A novel Gram-stain-positive, aerobic actinobacterial strain, designated GXMU-J15T, was isolated from dry mudflat sand. A polyphasic approach was employed for its taxonomic characterization. The strain developed extensively branched yellowish white to light yellow substrate mycelia and white aerial mycelia, and produced smooth cylindrical spores in a loose straight spore chain on International Streptomyces Project 2–7 agar media. Strain GXMU-J15T grew at 20–50 °C (optimum, 35 °C), at pH 5.0–8.0 (optimum, pH 7.0) and in the presence of 0–8 % (w/v) NaCl. Analysis of 16S rRNA gene sequences indicated that strain GXMU-J15T represents a member of the genus Streptomyces . Strain GXMU-J15T showed the highest 16S rRNA gene sequence similarity to Streptomyces lusitanus CGMCC 4.1745T (99.1 %) and Streptomyces thermocarboxydus CGMCC 4.1883T (98.8 %). Phylogenetic tree analysis based on multilocus sequence analysis (MLSA) and whole genome sequence construction revealed that strain GXMU-J15T was most closely related to Streptomyces cupreus PSKA01T, Streptomyces cinnabarinus DSM 40467T and Streptomyces davaonensis JCM 4913T. The MLSA and genome-to-genome distances between strain GXMU-J15T and its relatives were 0.0418, 0.0443 and 0.0485 and 0.1237, 0.1188 and 0.1179, respectively. The results of orthologous average nucleotide identity and digital DNA–DNA hybridization analysis corroborated the results of the MLSA and whole genome sequence evolution analysis, indicating that the novel isolate represents a distinct species of the genus Streptomyces . The whole-cell sugars of strain GXMU-J15T were xylose, glucose and galactose. The characteristic diamino acid in the cell-wall hydrolysate was ll-diaminopimelic acid. The lipids contained diphosphatidylglycerol, phosphatidylmethylethanolamine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol, phosphatidylglycerides, phosphatidylcholine, two phospholipids of an unknown structure containing glucosamine, one unknown phospholipid and two unknown lipids. The major cellular fatty acid components were iso-C15 : 0, anteiso-C15 : 0, iso-C16 : 0 and anteiso-C17 : 0. The main respiratory quinone types were MK-9(H6) and MK-9(H8). The whole genome size of strain GXMU-J15T was 8.68 Mbp, with 71.23 mol% G+C content. Genomic analysis indicated that strain GXMU-J15T has the potential to synthesize polyketides, terpenes and a series of important antibiotics besides the gene cluster for melanin synthesis. Based on these genotypic and phenotypic data, strain GXMU-J15T is proposed to represent a new species of the genus Streptomyces named Streptomyces fuscus sp. nov. The type strain is GXMU-J15T (=MCCC 1K08211T=JCM 35917T).

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Crabs Marine Waste—A Valuable Source of Chitosan: Tuning Chitosan Properties by Chitin Extraction Optimization

Cited by 16 publications

References 44 publications

Circular Economy in Guaiamum and Uçá Crab Waste in Brazil: Potential By-Products—A Systematic Literature Review

Circular Economy in Guaiamum and Uçá Crab Waste in Brazil: Potential By-Products—A Systematic Literature Review

Simultaneous Optimization of Deacetylation Degree and Molar Mass of Chitosan from Shrimp Waste

Streptomyces fuscus sp. nov., a brown-black pigment producing actinomycete isolated from dry mudflat sand

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