Dynamic light scattering studies of irradiated kappa carrageenan

Abad, Lucille V.; Nasimova, I. R.; Relleve, Lorna S.; Aranilla, C.T.; Rosa, A.M. de la; Shibayama, Mitsuhiro

doi:10.1016/j.ijbiomac.2004.03.012

Cited by 21 publications

(7 citation statements)

References 24 publications

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“…-Carrageenan on the other hand has a broader peak at 200 kGy. Previous work indicates the possibility of damage to the glycosidic linkage of -carrageenan resulting in ring opening at this high dose [15]. In the case of agar, irradiation at 100 kGy resulted in the separation of two fast modes ( −1 = 0.46 and 3.93 ms).…”

Section: Effect Of Irradiation On the Component Fractions Of Carrageementioning

confidence: 74%

“…The gelation temperatures of -and -carrageenan also decreases with irradiation dose up to 50 kGy. No gelation occurs beyond this dose [15][16]. While both -and -carrageenan undergoes transitions from coil to helix to gel with decreasing temperatures, -carrageenan does not have these transitions.…”

Section: Conformational Changes With Temperature and Dosementioning

confidence: 91%

“…The conformational associative properties of carrageenan and agar have extensively been studied using several methods including light scattering techniques [1][2][3][4][5][6][7][8][9][10][11][12][13]. Decrease in molecular weight by degradation either by sonolysis or ionizing radiation can also affect so much these transitions [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Radiation effects on these natural polymers have resulted in the drastic decrease of molecular weight with increasing irradiation dose [21][22][23][24]. The effect of irradiation on the structure transformation ofand -carrageenan with temperature has already been investigated by dynamic light scattering and small angle neutron scattering [15,16,25]. While the study is limited to these two types of carrageenans, this paper presents a comprehensive understanding of the component fractions formed, changes in conformation and aggregation behavior of the different linear chain polysaccharides, -, -, -carrageenan and agar, with changes in temperature at different irradiation doses.…”

Section: Introductionmentioning

confidence: 99%

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Comparative studies on the conformational change and aggregation behavior of irradiated carrageenans and agar by dynamic light scattering

Abad¹,

Okabe

Shibayama

et al. 2008

International Journal of Biological Macromolecules

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Section: Effect Of Irradiation On the Component Fractions Of Carrageementioning

confidence: 74%

Section: Conformational Changes With Temperature and Dosementioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative studies on the conformational change and aggregation behavior of irradiated carrageenans and agar by dynamic light scattering

Abad¹,

Okabe

Shibayama

et al. 2008

International Journal of Biological Macromolecules

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“…Gamma irradiated carrageenan (ICA) has concrete application in agriculture, used either hydroponically or through foliar sprays as plant growth promoter. As per reports, foliar application of ICA enhanced the length of root in potato [12], shoot and root length in rice [13], and increased number of leaves, shoot length and fresh weight of pechay ( Brassicarapa ) [9]. It exerts spectacular effects on physiological activities leading to enhanced productivity of plants [14–17, 10, 11].…”

Section: Introductionmentioning

confidence: 97%

Proliferating effect of radiolytically depolymerized carrageenan on physiological attributes, plant water relation parameters, essential oil production and active constituents of Cymbopogon flexuosus Steud. under drought stress

et al. 2017

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Carrageenan has been proved as potent growth promoting substance in its depolymerized form. However, relatively little is known about its role in counteracting the adverse effects of drought stress on plants. In a pot experiment, lemongrass (Cymbopogon flexuosus Steud.), grown under different water stress regimes [(100% field capacity (FC), 80% FC and 60% FC)], was sprayed with 40, 80 and 120 mg L-1 of gamma irradiated carrageenan (ICA). Foliar application of ICA mitigated the harmful effects of drought stress to various extents and improved the biochemical characteristics, quality attributes and active constituents (citral and geraniol) of lemongrass significantly. Among the applied treatments, ICA-80 mg L-1 proved the best in alleviating detrimental effects of drought. However, drought stress (80 and 60% FC), irrespective of the growth stages, had an adverse impact on most of the studied attributes. Generally, 60% FC proved more deleterious than 80% FC. At 80% FC, application of ICA-80 mg L-1 elevated the essential oil (EO) content by 18.9 and 25%, citral content by 7.33 and 8.19% and geraniol content by 9.2 and 8.9% at 90 and 120 days after planting (DAP), respectively, as compared to the deionized-water (DW) spray treatment (80% FC+ DW). Whereas, at 60% FC, foliar application of 80 mg L-1 ICA significantly augmented the EO content by 15.4 and 17.8% and active constituents viz. citral and geraniol, by 5.01 and 5.62% and by 6.06 and 5.61% at 90 and 120 DAP, respectively, as compared to the control (water-spray treatment).

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Seaweed Oligosaccharides Stimulate Plant Growth by Enhancing Carbon and Nitrogen Assimilation, Basal Metabolism, and Cell Division

González

Castro

Vera

et al. 2012

J Plant Growth Regul

160

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It is now well established that plant cell wall oligosaccharides can stimulate or inhibit growth and development in plants. In addition, it has been determined that seaweed (marine algae) cell wall polysaccharides and derived oligosaccharides can enhance growth in plants. In particular, oligo-alginates obtained by depolymerization of alginates from brown seaweeds increase growth of different plants by enhancing nitrogen assimilation and basal metabolism. Interestingly, oligo-alginates also stimulate growth of marine and fresh water green microalgae, increasing the content of fatty acids. On the other hand, oligo-carrageenans obtained by depolymerization of carrageenans from red seaweeds increase growth of tobacco plants by enhancing photosynthesis, nitrogen assimilation, basal metabolism, and cell division. In addition, oligocarrageenans increase protection against viral, fungal, and bacterial infections in tobacco plants, which is determined, at least in part, by the accumulation of several phenylpropanoid compounds (PPCs) with antimicrobial activity. Moreover, oligo-carrageenans stimulate growth of 3-yearold Eucalyptus globulus trees by increasing photosynthesis, nitrogen assimilation, and basal metabolism. Furthermore, oligo-carrageenans induce an increase in cellulose content and in the level of essential oil and some PPCs with antimicrobial activities, suggesting that defense against pathogens may be also enhanced. Thus, seaweed oligosaccharides induce a dual beneficial effect in plants and trees, enhancing growth, which is determined by the increase in carbon and nitrogen assimilation, basal metabolism, and cell division, and defense against pathogens, which is determined by the accumulation of compounds with antimicrobial activities. In this sense, molecular mechanisms that potentially interconnect activation of plant growth and defense responses are discussed.

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Dynamic light scattering studies of irradiated kappa carrageenan

Cited by 21 publications

References 24 publications

Comparative studies on the conformational change and aggregation behavior of irradiated carrageenans and agar by dynamic light scattering

Comparative studies on the conformational change and aggregation behavior of irradiated carrageenans and agar by dynamic light scattering

Proliferating effect of radiolytically depolymerized carrageenan on physiological attributes, plant water relation parameters, essential oil production and active constituents of Cymbopogon flexuosus Steud. under drought stress

Seaweed Oligosaccharides Stimulate Plant Growth by Enhancing Carbon and Nitrogen Assimilation, Basal Metabolism, and Cell Division

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