Alginic acids in Lessonia vadosa: Partial hydrolysis and elicitor properties of the polymannuronic acid fraction

Chandía, Nancy P.; Matsuhiro, Betty; Mejías, Enrique; Moenne, Alejandra

doi:10.1023/b:japh.0000044778.44193.a8

Cited by 119 publications

(80 citation statements)

References 20 publications

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“…These band positions are in agreement with the values reported by Sartori et al 60 Chandía et al 61 and Mathlouthi et al 63 These bands are mainly due to the out-of plane deformation of the glycosidic bond on the pyranose rings coupled with other deformation …”

Section: One-dimensional Ft-ir Analysissupporting

confidence: 92%

“…Bands around 1150-810 cm -1 are representative of pyranose skeleton modes. 54,[60][61][62] The -C-C-stretching vibrations of mannuronic and gluluronic units are pointed out around 1095 cm -1 . 63 This band is overlapping with the band corresponding to -C-O-stretching, as shown in the secondderivative spectra, with two bands well defined at 1132 and 1095 cm -1 .…”

Section: One-dimensional Ft-ir Analysismentioning

confidence: 97%

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Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

Díaz-Visurraga¹,

Daza²,

Pozo³

et al. 2012

IJN

109

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Background:The objective of this study was to clarify the intermolecular interaction between antibacterial copper nanoparticles (Cu NPs) and sodium alginate (NaAlg) by Fourier transform infrared spectroscopy (FT-IR) and to process the spectra applying two-dimensional infrared (2D-IR) correlation analysis. To our knowledge, the addition of NaAlg as a stabilizer of copper nanoparticles has not been previously reported. It is expected that the obtained results will provide valuable additional information on: (1) the influence of reducing agent ratio on the formation of copper nanoparticles in order to design functional nanomaterials with increased antibacterial activity, and (2) structural changes related to the incorporation of Cu NPs into the polymer matrix. Methods: Cu NPs were prepared by microwave heating using ascorbic acid as reducing agent and NaAlg as stabilizing agent. The characterization of synthesized Cu NPs by ultraviolet visible spectroscopy, transmission electron microscopy (TEM), electron diffraction analysis, X-ray diffraction (XRD), and semiquantitative analysis of the weight percentage composition indicated that the average particle sizes of Cu NPs are about 3-10 nm, they are spherical in shape, and consist of zerovalent Cu and Cu 2 O. Also, crystallite size and relative particle size of stabilized Cu NPs were calculated by XRD using Scherrer's formula and FT from the X-ray diffraction data. Thermogravimetric analysis, differential thermal analysis, differential scanning calorimetry (DSC), FT-IR, second-derivative spectra, and 2D-IR correlation analysis were applied to studying the stabilization mechanism of Cu NPs by NaAlg molecules. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of stabilized Cu NPs against five bacterial strains (Staphylococccus aureus ATCC 6538P, Escherichia coli ATCC 25922 and O157: H7, and Salmonella enterica serovar Typhimurium ATCC 13311 and 14028) were evaluated with macrodilution, agar dilution plate count, and well-diffusion methods. Results: On the basis of the semiquantitative analysis, there was a direct correlation between the reducing agent ratio and the percentage of zerovalent Cu. This was confirmed with the statistical analysis of population of Cu NPs from TEM micrographs. At lower reducing agent ratios, two phases coexist (Cu 2 O and zerovalent Cu) due to incomplete reduction of copper ions by the reducing agent; however, at higher reducing agent ratios, the Cu NPs consist mainly of zerovalent Cu. Crystallite size and relative particle size of stabilized Cu NPs showed considerable differences in results and tendencies in respect to TEM analysis. However, the relative particle size values obtained from FT of XRD data agreed well with the histograms from the TEM observations. From FT results, the relative particle size and reducing agent ratio of stabilized Cu NPs showed an inverse correlation. The incomplete reduction of copper ions at lower reducing agent ratios was also confirmed by DSC studies. FT-IR and 2D-IR correl...

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Section: One-dimensional Ft-ir Analysissupporting

confidence: 92%

Section: One-dimensional Ft-ir Analysismentioning

confidence: 97%

Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

Díaz-Visurraga¹,

Daza²,

Pozo³

et al. 2012

IJN

109

View full text Add to dashboard Cite

show abstract

“…Eventhogh, the yield of Calcium alginate was the lowest one. (Chandia et al, 2004). The extraction of S. filipendula was done by formalin 0.4% (w/w) maseration, Na2CO3 addition and acid precipitation.…”

Section: Alginate Extraction and Yieldmentioning

confidence: 99%

Characterizing the Three Different Alginate Type of Sargassum siliquosum

Yudiati

Isnansetyo

2017

Indo. J. Mar. Sci.

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“…Potential of algino-oligosaccharides to protect against rice blast disease Although elicitor activity has been shown to reside in some alginate oligomers, [10,11] there has been little research on its potential application in protection against rice blast disease. So far, the use of chemical pesticides appears to offer marginal protection from the disease.…”

Section: Effect Of Algino-oligosaccharides On Infection Of Rice Plantmentioning

confidence: 99%

“…[9] The oligomers of alginate rich in polymannuronic acid could elicit a significant increase in the level of phenylalanine ammonia lyase (PAL) and peroxidase (POD) activity. [10] Alginate oligomers have also been demonstrated to stimulate the production of 5 0 -phosphodiesterase in suspension-culture plant cells, in synergy with the effect that the active oxygen species has on the chitinase activity. [11] However, all these identified oligosaccharides were produced from an acid-hydrolysed or heat-degraded alginate, in which the activities are only at trace levels and are structure-dependent.…”

Section: Introductionmentioning

confidence: 99%

Elicitor activity of algino-oligosaccharide and its potential application in protection of rice plant (Oryza salivaL.) againstMagnaporthe grisea

Shan

Tang

Jiang

et al. 2015

Biotechnology & Biotechnological Equipment

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Rice blast caused by Magnaporthe grisea is considered to be one of the most devastating diseases in most rice-growing regions. In order to search for an effective agent to protect against rice infection, the elicitor activity of alginooligosaccharides was evaluated in germinating rice, in which accumulation of oryzalexin C could be detected sensitively. The maximal elicitor activity was detected in germinating rice seedlings when the fractions of alginate degradation products with a degree of polymerization of 7.9 (S3) and 6.5 (S4) were used as elicitors. Algino-oligosaccharides could induce the enzyme activities of phenylalanine ammonia lyase, peroxidase and catalase in rice plant cells for protection of the plant against the invading pathogen. With utilization of algino-oligosaccharides, the disease index caused by Magnaporthe grisea could be reduced from 17.74% to 10.81% and the protection efficacy was 39.06%. These findings suggest that algino-oligosaccharides could be applied as a biological agent to control rice blast disease.

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Alginic acids in Lessonia vadosa: Partial hydrolysis and elicitor properties of the polymannuronic acid fraction

Cited by 119 publications

References 20 publications

Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

Characterizing the Three Different Alginate Type of Sargassum siliquosum

Elicitor activity of algino-oligosaccharide and its potential application in protection of rice plant (Oryza salivaL.) againstMagnaporthe grisea

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