The conversion of calcium alginate fibers into alginic acid fibers and sodium alginate fibers

2006 ◽  
Vol 101 (6) ◽  
pp. 4216-4221 ◽  
Author(s):  
Yimin Qin ◽  
Huiqun Hu ◽  
Aixiang Luo
Keyword(s):  
Sodium Alginate ◽  
Calcium Alginate ◽  
Alginic Acid ◽  
Alginate Fibers

scholarly journals RECIRCULACIÓN DE LÍQUIDOS RESIDUALES EN LA CONVERSIÓN DE ALGINATO DE CALCIO EN ÁCIDO ALGÍNICO DURANTE EL PROCESO DE PRODUCCIÓN DE ALGINATOS

2005 ◽  
Vol 20 (1-2) ◽  
pp. 1
Author(s):  
Y. E. Rodríguez-Montesinos ◽  
G. Hernández-Carmona ◽  
D. L. Arvizu-Higuera
Keyword(s):  
Calcium Alginate ◽  
Alginic Acid ◽  
Current System ◽  
Macrocystis Pyrifera ◽  
Alginate Production ◽  
Yield And Quality ◽  
Alginate Fibers ◽  
Counter Current ◽  
Very High

Se estudió el efecto de recircular la solución ácida residual en la etapa de conversión de alginato de calcio en ácido algínico, utilizando el alga Macrocystis pyrifera . Los líquidos residuales fueron reciclados en un sistema en contra corriente, con lo cual se logró procesar tres cargas de alginato de sodio con el mismo volumen de agua, permitiendo una conversión efectiva en ácido algínico, con una reducción del 56% en el consumo de agua dulce. Se experimentó un sistema de recirculación en línea (sin reemplazo de agua), este sistema no es recomendable, debido a que la acumulación de calcio en el alginato después de la segunda recirculación, produce una viscosidad aparente muy alta, con un porcentaje de reducció superior al 50%. Se determinó el efecto del número de lavados ácidos del ácido algínico sobre la calidad y rendimiento del alginato obtenido. El tratamiento ácido se llevó a cabo con tres, dos y un lavado. Se concluye que se requieren tres lavados de las fibras de alginato de calcio para lograr una conversión efectiva en ácido algínico, pero el primero y segundo lavado se pueden hacer con ácido reciclado. Es tesis tema representa un ahorro del 66% en el consumo de agua en esta etapa. Recycling of residual liquids from the conversion of calcium alginate to alginic acid during alginate production process The effect of recycling the residual acid solution from the conversion of calcium alginate to alginic acid from the alga Macrocystis pyrifera was studied. The residual liquid was recycled using a counter current system; it was possible to treat three batches of calcium alginate with the same amount of water, with an effective conversion into alginic acid, saving 56% of fresh water. An inline recycling system was experimented (without water replacement). This system is not recommended, because the large increase of calcium in the alginate after the second recycling, produces a very high apparent viscosity. Using this system the viscosity was reduced in more than 50%. We experimented the effect of the number of acid washings of the alginic acid, on the yield and quality of the final alginate. The acid treatment was carried out with three, two and one washing. It was concluded that three acid washings of the calcium alginate fibers are necessary to obtain an effective conversion of calcium alginate to alginic acid, but the first and second washings can be carried out with recycled acid. This system represents a water saving up to 66% in this step.

scholarly journals Structure–Property of Wet-Spun Alginate-Based Precursor Fibers Modified with Nanocarbons

2020 ◽  
Vol 20 (1) ◽  
pp. 32-42 ◽  
Author(s):  
Grzegorz Szparaga ◽  
Magdalena Brzezińska ◽  
Ewelina Pabjańczyk-Wlazło ◽  
Michał Puchalski ◽  
Sławomir Sztajnowski ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Carbon Nanostructures ◽  
Alginic Acid ◽  
Base Material ◽  
Structure Property ◽  
Multiwalled Carbon ◽  
Carbon Structures ◽  
Tension Testing ◽  
Cost Efficient ◽  
Alginate Fibers

AbstractThe results of studies assessing the influence of the addition of carbon nanofillers, such as multiwalled carbon nanotubes (MWCNTs) and graphene oxide (GO) that differ in size and structure, on the molecular and supramolecular structure and properties of alginate fibers that might be prospective precursors for carbon fiber (PCF) industry are presented in this article. The investigation was carried out by Fourier transform infrared (FTIR) spectroscopy, wide-angle X-ray diffraction (WAXD), and tension testing. In the frame of the current study, two types of alginate fibers were examined and compared: alginic acid and calcium alginate fibers. Alginic acid fibers were formed by chemical treatment of calcium alginate fibers with hydrochloric acid due to the fact that Ca2+ ions presented in the fibers were expected to adversely affect the prospective carbonization process. This investigation brought important conclusions about the influence of nanofillers on the physical properties of the final material. Understanding the link between the incorporation of carbon nanostructures and a possible influence on the formation of ordered carbon structures in the precursor fibers brings an important opportunity to get insights into the application of alginate fibers as a prospective base material for obtaining cost-efficient carbon fibers.

scholarly journals Comparison of porous carbons derived from sodium alginate and calcium alginate and their electrochemical properties

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 2209-2215
Author(s):  
Ming Li ◽  
Kuihua Han ◽  
Zhaocai Teng ◽  
Jinxiao Li ◽  
Meimei Wang ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Sodium Alginate ◽  
Calcium Alginate ◽  
Alginic Acid ◽  
Porous Carbons

Comparisons of the microstructures and electrochemical properties of porous carbons derived from the carbon-forming component alginic acid under the action of Na/Ca.

Flame Retardancy and Pyrolysis Products of Calcium Alginate Fibers

2012 ◽  
Vol 441 ◽  
pp. 346-350 ◽  
Author(s):  
Chuan Jie Zhang ◽  
Ping Zhu ◽  
Jin Chao Zhao ◽  
Nan Nan Zhang
Keyword(s):  
Thermal Degradation ◽  
Heat Release ◽  
Flame Retardant ◽  
Sodium Alginate ◽  
Calcium Alginate ◽  
Cotton Fibers ◽  
Pyrolysis Products ◽  
Limiting Oxygen Index ◽  
Combustion Properties ◽  
Alginate Fibers

The combustion properties, flame retardant property, thermal degradation and component of pyrolysis products of calcium alginate fibers were investigated in this paper. The limiting oxygen index value of calcium alginate fibers was 34.4 showing no combustion in the air. The fiber extinguishes instantly when it is moved away from the fire. During the combustion process, the heat release rates (HRR), effective heat combustion (EHC) and total heat release (THR) of calcium alginate fibers were lower than those of cotton fibers, but higher than those of sodium alginate. The carbon dioxide yield rate of calcium alginate fibers was higher than that of cotton fibers but lower than that of sodium alginate. Calcium carbonate and calcium hydroxide, which are beneficial to hamper fibers combustion and diffusion of heat and oxygen, were formed during thermal degradation of calcium alginate fibers. There were 15 kinds of pyrolysis products in gas phase of calcium alginate fibers at 350°C and 45 kinds at 700 °C, while there were 26 kinds of pyrolysis products of sodium alginate at 350°C and 26 kinds at 700°C. Based on a series of study, the flame retardant mechanism of calcium alginate fibers was analyzed.

scholarly journals Formulation and Mathematical Optimization of Controlled Release Calcium Alginate Micro Pellets of Frusemide

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Amitava Ghosh ◽  
Prithviraj Chakraborty
Keyword(s):  
Sodium Alginate ◽  
Calcium Alginate ◽  
Mathematical Optimization ◽  
Extended Period ◽  
Cost Effective ◽  
Polynomial Equation ◽  
Chronic Hypertension ◽  
Order Polynomial ◽  
High Degree

Objective. Frusemide loaded calcium alginate micropellets, an oral microparticulate delivery system, was statistically optimized exhibiting prolonged therapeutic action minimizing its adverse effects.Methods. Ionotropic Gelation technique was adopted employing 32Factorial designs and keeping the entire process free from organic solvents. Physicochemical and the release characteristics of the prepared formulations were studied, keeping variations only in sodium alginate (primary polymer) and Acrycoat E30D (copolymer) dispersion.Result. Sodium alginate was predominant over Acrycoat E30D in all batches. Nonadditives or interaction was observed to be insignificant. Multiple regressions produced second-order polynomial equation, and the predictive results obtained were validated with high degree of correlation. Thein vivostudy applauded that optimized calcium alginate micropellets of frusemide can produce a much greater diuretic effect over an extended period of 24 hours.Conclusion. This study reveals that the potential of a single dose of the mathematically optimized micro pellets of frusemide formulation is sufficient in the management of peripheral edema and ascites in congestive heart failure and as well in the treatment of chronic hypertension, leading to better patient compliance, and can be produced with minimum experimentation and time, proving far more cost-effective formulation than the conventional methods of formulating dosage forms.

Cytotoxicity and Antiviral Activity of Calcium Alginate Fibers and Zinc Alginate Fibers

2010 ◽  
Vol 152-153 ◽  
pp. 1475-1478 ◽  
Author(s):  
Ying Gong ◽  
Guang Ting Han ◽  
Xin Ling Li ◽  
Yan Wu ◽  
Yuan Ming Zhang ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Activity Assay ◽  
Cytotoxic Effects ◽  
African Green Monkey Kidney ◽  
Relative Growth ◽  
Human Cervical Cancer Cell ◽  
Green Monkey ◽  
Alginate Fibers ◽  
Alginate Fibres ◽  
Mtt Assays

The cytotoxicity and anti-influenza virus (IFV) activity of calcium or zinc alginate fibers were investigated to explore the feasibility of them to be used as biomaterials. African Green Monkey kidney cell (Vero) and human cervical cancer cell (Hela) cultured with alginate fibres were used to screen cytotoxic effects. After 48 h, MTT (3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H tetrazolium bromide) assays were performed. Then cytotoxicity was evaluated with six grades according to cell relative growth rate (RGR). In anti-IFV activity assay, IFV were added to all fibers and the Vero cell survival were detected by MTT assays with calculating the percentage of protection. The cytotoxity of calcium alginate fibers on Vero were grade 0 or 1 in contrast to zinc alginate fibers which was grade 0. The cytotoxity of calcium or zinc alginate fibers on Hela were grade 0. Furthermore, partial calcium or zinc alginate fibers could promote Vero or Hela cell growth. In antiviral assay the highest percentage of protection of calcium alginate fibers was 34.42%, while that of zinc alginate fibers was 59.42%. The results showed that calcium or zinc alginate fibers had a good cellular biocompatibility and the large weight zinc alginate fibers had a better anti-IFV activity than calcium alginate fibers, which is potential for tissue engineering.

Design for dynamic hydrogen bonding in a double network structure to improve the mechanical properties of sodium alginate fibers

2021 ◽  
Author(s):  
Ming Yan ◽  
Junfeng Shi ◽  
Song Tang ◽  
Guohang Zhou ◽  
Jiexiang Zeng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Sodium Alginate ◽  
Network Structure ◽  
Wet Spinning ◽  
Double Network ◽  
Alginate Fibers

The SA/PAA-VSNP fiber was obtained using dynamic wet spinning through dynamic hydrogen bonding in the double network structure.

Strengthening and toughening sodium alginate fibers using a dynamically cross-linked network of inorganic nanoparticles and sodium alginate through the hydrogen bonding strategy

2021 ◽  
Author(s):  
Ming Yan ◽  
Junfeng Shi ◽  
Song Tang ◽  
Lingwei Liu ◽  
Haotong Zhu ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Sodium Alginate ◽  
Inorganic Nanoparticles ◽  
Alginate Fibers

Nanoparticles were introduced to strengthen and toughen sodium alginate fibers through a dynamically cross-linked network by hydrogen bonding.

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