Preliminary Characterization of Carrageenan from the Red Seaweed<i>Halymenia floresii</i>

Freile‐Pelegrín, Yolanda; Azamar, J.A.; Robledo, Daniel

doi:10.1080/10498850.2010.541590

Cited by 38 publications

(26 citation statements)

References 25 publications

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“…For the alkaline treated carrageenan, yields found in this study were in the range of those reported for other species such as 26.2% from H. porphyroides (Indian Ocean) [32], 29.1% from H. durvillei (Philippines) [33], 20-32% from K. alvarezii (Brazil) [34,35], 15% from H. durvillei (Madagascar) [36], 26.8% from H. floresii (México) [37], and 25.8-37.2% from E. spinosum (Indonesia) [38].…”

Section: Resultssupporting

confidence: 72%

“…The interaction between independent variables was found to be nonsignificant. This finding was not a surprise, but in contrary it was expected due to partial degradation of polysaccharide chains by alkali moieties, since alkaline extraction operation inevitably involves some degradation of the polysaccharide which accelerates at elevated temperatures [4,11,31,37,40]. Furthermore, further increase in the alkali concentration could lead to a sharp decrease in yield [4].…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted fromHypnea bryoides

Al-Nahdi

Al‐Alawi

Al-Marhobi

2019

Journal of Marine Biology

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Hypnea bryoides collected from the Arabian Sea on the southern coast of Oman was investigated for κ-carrageenan optimal extraction conditions. The effects of different conditions of alkali treatment (4, 6, and 8% w/v NaOH), temperatures (70, 75, and 80°C), and time (2, 2.75, 3.5 hours) on carrageenan yield and chemical and thermal properties were evaluated. Yield was significantly affected by alkaline concentration and temperature, with highest value of 26.74 ± 5.01%. Molecular weights of the extracted carrageenan were significantly reduced by increased temperatures and ranged from 5.95 ± 0.49 × 105 Da to 13.90 ± 0.14 × 105. FTIR showed that samples under all extraction conditions were similar and confirmed the presence of κ-carrageenan with no traces of μ-precursor. Sulfate content was also significantly reduced by alkaline concentration (from 4% to 6%) and ranged from 7.62 ± 5.52% to 17.02 ± 0.14. Thermal properties showed more sensitivity towards temperature and alkaline strength parameter than time. In addition, melting and gelling temperatures were significantly correlated with the molecular weight, but not sulfate content. In conclusion, mild extraction conditions were found to be more efficient in introducing the intended structural modification while getting the highest yield and quality.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted fromHypnea bryoides

Al-Nahdi

Al‐Alawi

Al-Marhobi

2019

Journal of Marine Biology

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“…The second degradation stage started at 150°C with a drastic weight loss of 17.4% at a T max of 209.34°C. This weight loss is associated with the degradation of sulphur dioxide from the polymeric backbone [ 32 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

“…The weight loss is attributed to the decomposition of –OSO 3 - group from the pendant chains attached to the polymeric backbone. Above 280°C, the degradation is caused by the fragmentation of carbohydrate backbone [ 34 ]. As shown by the less steep slope and higher degradation temperature of OMPC, the thermal stability of OMPC is slightly improved over that of κ-carrageenan because of its higher crystallinity content as confirmed by the XRD results [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of modified κ-carrageenan for enhanced proton conductivity as polymer electrolyte membrane

et al. 2017

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Polymer electrolyte membranes based on the natural polymer κ-carrageenan were modified and characterized for application in electrochemical devices. In general, pure κ-carrageenan membranes show a low ionic conductivity. New membranes were developed by chemically modifying κ-carrageenan via phosphorylation to produce O-methylene phosphonic κ-carrageenan (OMPC), which showed enhanced membrane conductivity. The membranes were prepared by a solution casting method. The chemical structure of OMPC samples were characterized using Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR) spectroscopy and 31P nuclear magnetic resonance (31P NMR) spectroscopy. The conductivity properties of the membranes were investigated by electrochemical impedance spectroscopy (EIS). The characterization demonstrated that the membranes had been successfully produced. The ionic conductivity of κ-carrageenan and OMPC were 2.79 × 10−6 S cm-1 and 1.54 × 10−5 S cm-1, respectively. The hydrated membranes showed a two orders of magnitude higher ionic conductivity than the dried membranes.

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“…Tropical red seaweed polysaccharides have been scarcely studied for their antiviral activity, however the heterogeneity of their polysaccharides varies from highly sulfated carrageenans from Halymenia floresii [10] to poor gelling agar polymers in Gracilaria sp. (G. cervicornis and G. blodgettii) with different degrees of methoxylation and sulphation at the C-6 of the β-D galactose residues [11].…”

mentioning

confidence: 99%

Antiviral and Cytotoxic Activities of Polysaccharides Extracted from Four Tropical Seaweed Species

Bedoux

Caamal-Fuentes²,

Boulho

et al. 2017

Natural Product Communications

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Polysaccharides extracted from Rhodymenia pseudopalmata, Solieria filiformis, Hydropuntia cornea (Rhodophyta) and Sargassum fluitans (Phaeophyceae) were evaluated for its cytotoxic and antiviral activities against Herpes simplex virus (HSV-Type 1). Chemical structures were characterized by FT-IR spectroscopy and 13 C-NMR analyses. Polysaccharides from Sargassum fluitans (EC 50 = 42.8 μg/ml) and Solieria filiformis (EC 50 = 136.0 μg/ml) showed antiviral activity against herpes simplex virus type-I in vitro at a multiplicity of infection (MOI) of 0.01 ID 50 /cells without cytotoxicity (1-200 μg/mL). The activity observed suggests that sulphation, molecular weight and carbohydrate nature of these polysaccharides may be involved in this activity. To better understand the antiviral activity of the polysaccharides evaluated, it seems important to study the mechanism of action involved. These polysaccharides could be studied further to evaluate their potential use as antiviral drugs.

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Preliminary Characterization of Carrageenan from the Red SeaweedHalymenia floresii

Cited by 38 publications

References 25 publications

The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted fromHypnea bryoides

The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted fromHypnea bryoides

Synthesis and characterization of modified κ-carrageenan for enhanced proton conductivity as polymer electrolyte membrane

Antiviral and Cytotoxic Activities of Polysaccharides Extracted from Four Tropical Seaweed Species

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