Antibacterial Activity from Indian Species of <i>Sargassum</i>

Rao, P.P.S.; Rao, Ravi S; Karmarkar, S. M.

doi:10.1515/botm.1988.31.4.295

Cited by 18 publications

(10 citation statements)

References 7 publications

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“…The kinetics of phosphate removal by adsorption was carried out to understand the behavior of the adsorbent developed in the present study. The adsorption of phosphate from the liquid phase to the solid phase can be considered as a second‐order reaction, that is, the adsorption rate constant, k ad , was obtained by assuming 24 that The desorption rate is small compared to the adsorption rate; The surface site concentration is expressed in the unit of the phosphate concentration; The rate of adsorption may be approximated as equal to the rate of decrease in the concentration of the sorbate solution, that is, k ad = − dc / dt ; and There is a monolayer of adsorbate species on the adsorbent, that is, adsorption follows the Langmuir equation. …”

Section: Resultsmentioning

confidence: 99%

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Ability of iron(III)‐loaded carboxylated polyacrylamide‐grafted sawdust to remove phosphate ions from aqueous solution and fertilizer industry wastewater: Adsorption kinetics and isotherm studies

Unnithan

Vinod

Anirudhan

2002

J of Applied Polymer Sci

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Iron(III)-loaded carboxylated polyacrylamide-grafted sawdust was investigated as an adsorbent for the removal of phosphate from water and wastewater. The carboxylated polyacrylamide-grafted sawdust was prepared by graft copolymerization of acrylamide and N,NЈ-methylenebisacrylamide onto sawdust in the presence of an initiator, potassium peroxydisulfate. Iron(III) was strongly attached to the carboxylic acid moiety of the adsorbent. The adsorbent material exhibits a very high adsorption potential for phosphate ions. The coordinated unsaturated sites of the iron(III) complex of polymerized sawdust were considered to be the adsorption sites for phosphate ions, the predominating species being H 2 PO 4 Ϫ ions. Maximum removal of 97.6 and 90.3% with 2 g L Ϫ1 of the adsorbent was observed at pH 2.5 for an initial phosphate concentration of 100 and 250 mol L Ϫ1 , respectively. The adsorption process follows secondorder kinetics. Adsorption rate constants as a function of concentration and temperature and kinetic parameters, such as ⌬G Ϯ , ⌬H Ϯ , and ⌬S Ϯ , were calculated to predict the nature of adsorption. The L-type adsorption isotherm obtained in the sorbent indicated a favorable process and fitted the Langmuir equation model well. The adsorption capacity calculated by the Langmuir adsorption isotherm gave 3.03 ϫ 10 Ϫ4 mol g Ϫ1 of phosphate removal at 30 o C and pH 2.5. The isosteric heat of adsorption was also determined at various surface loadings of the adsorbent. The adsorption efficiency toward phosphate removal was tested using industrial wastewater. Different reagents were tested for extracting phosphate ions from the spent adsorbent. About 98.2% of phosphate can be recovered from the adsorbent using 0.1M NaOH. Alkali regeneration was tried for several cycles with a view to recover the adsorbed phosphate and also to restore the adsorbent to its original state.

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Section: Resultsmentioning

confidence: 99%

“…The following integrated rate expression 24 is used to calculate the second‐order rate constant ( k ad ) values: where C 0 is the initial bulk concentration of the adsorbate solution, and C , the concentration in the aqueous phase at time t . The linear plots of 1/ C versus t (Fig.…”

Section: Resultsmentioning

confidence: 99%

Ability of iron(III)‐loaded carboxylated polyacrylamide‐grafted sawdust to remove phosphate ions from aqueous solution and fertilizer industry wastewater: Adsorption kinetics and isotherm studies

Unnithan

Vinod

Anirudhan

2002

J of Applied Polymer Sci

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“…Besides, methanol extract proves its efficiency when compared to aqueous extract due to the presence of secondary metabolites. Rao et al [24] have reported that 12 different species of Sargassum extract possess high anti-bacterial activity against human pathogenic bacteria. Similarly, Shelat [25] have found that methanol extract of Sargassum plagiophyllum was found to be active against Gram-positive bacteria while acetone extract of Sargassum tenerrimum showed high activity against all tested strains.…”

Section: Comparative Anti-bacterial Activitymentioning

confidence: 99%

Synthesis of Silver Nanoparticles from Sargassum Tenerrimum and Screening Phytochemicals for Its Antibacterial Activity

Kumar¹,

Selvi²,

Prabha³

et al. 2012

Nano BioMed ENG

105

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Synthesis of nanomaterials by biological approach is innovative, cheaper and environmental friendly and requires less-labor. In this regard, the present study focused on the synthesis of silver nanoparticles from the extract of Sargassum tenerrimum. Synthesized silver nanoparticles were wellcharacterized by UV-Visible Spectroscopy (UV-Vis), Fourier-Transform Infra-red Spectroscopy (FT-IR), Transmission Electron Microscopy analysis (TEM) and Dynamic Light Scattering (DLS). It was found that spherical shaped nanoparticles of size 20 nm were found in TEM analysis and showed effective anti-bacterial activity against standard reference strains. Altogether, extracts from seaweed were screened for phytochemicals followed by FT-IR prediction to reveal chemical functional groups present. The results showed that the anti-bacterial activity of silver nanoparticles was comparably higher than the phytochemicals present. Therefore, the present study elucidates silver nanoparticles can play a vital role in nano-based therapy in future. Citation: P. Kumar, et al. Synthesis of silver nanoparticles from Sargassum tenerrimum and screening phytochemicals for its anti-bacterial activity.

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“…However, because the 13C chemical shifts reported for 51 correspond poorly to those cited for sclerophytin F ( 45 ), the possibility that the latter is simply the epimeric formulation at that site can be precluded. Other ambiguities certainly do exist,36–40 and these have been tabulated 30…”

Section: A More Expansive Look At the Sclerophytin Familymentioning

confidence: 99%

The sclerophytin A adventure

Paquette

2001

The Chemical Record

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The structural designation A originally made by Sharma and Alam to sclerophytin A was considered to be ambiguous and so notably strained relative to B that the latter was targeted for de novo synthesis (Scheme 1). Our two successful routes began with (5S)-(d-menthyloxy)-2(5H)-furanone and involved the application of cycloaddition, Claisen ring expansion, transannular oxymercuration, and 1,2-carbonyl transposition tactics to arrive at B. It was immediately apparent from polarity considerations and spectroscopic data that the antileukemic marine metabolite in question was in need of more deep-seated structural revision. Following close re-examination of an acquired authentic sample by advanced NMR techniques, the strong inference was made that sclerophytin A actually lacked a second oxygen bridge and was in reality the triol C. This conclusion was unequivocally confirmed by diverting an advanced intermediate generated earlier into a short sequence beginning with regiocontrolled dihydroxylation and terminating with configurational inversion at the secondary carbinol center. The status of other members of this series is also presented.

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Antibacterial Activity from Indian Species of Sargassum

Cited by 18 publications

References 7 publications

Ability of iron(III)‐loaded carboxylated polyacrylamide‐grafted sawdust to remove phosphate ions from aqueous solution and fertilizer industry wastewater: Adsorption kinetics and isotherm studies

Ability of iron(III)‐loaded carboxylated polyacrylamide‐grafted sawdust to remove phosphate ions from aqueous solution and fertilizer industry wastewater: Adsorption kinetics and isotherm studies

Synthesis of Silver Nanoparticles from Sargassum Tenerrimum and Screening Phytochemicals for Its Antibacterial Activity

The sclerophytin A adventure

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