Radiation-induced degradation of sodium alginate and its plant growth promotion effect

El‐Mohdy, H. L. Abd

doi:10.1016/j.arabjc.2012.10.003

Cited by 83 publications

(41 citation statements)

References 30 publications

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“…Figure 2 depicts the UV spectra of the irradiated and unirradiated forms of sodium alginate; it reveals the formation of a new absorption band at approximately 265 nm in ISA, which was absent in UISA. The formation of the new peak could be attributed to the formation of carbonyl (C=O) groups after the main chain scission of alginate and hydrogen abstraction, followed by the ring opening in the radiation-induced degradation process (Luan et al, 2009;El-Mohdy, 2012). 3.2.…”

Section: Resultsmentioning

confidence: 99%

“…Depolymerization of sodium alginate (powder form) requires high irradiation doses (El-Mohdy, 2012) and the change in the molecular weight of alginate (if any) as a result of radiation-based degradation is estimated by GPC (Hien et al, 2000). The GPC profile helps in unraveling the gamma radiation-mediated depolymerization of polysaccharides as a result of chain scission of the complex natural polysaccharide.…”

Section: Discussionmentioning

confidence: 99%

“…Since these fractions are small enough to penetrate easily through the stomatal aperture upon foliar feeding, they are expected to trigger growth-promoting activities in plants. It is speculated that after gamma irradiation these oligosaccharides bind to certain receptor proteins inducing different signaling pathways, thereby eliciting the improved growth and yield in plants (El-Mohdy, 2012). The present experiment was conducted considering the growthtriggering effect of these oligosaccharides in various other MAPs Idrees et al, 2014;Naeem et al, 2015;Aftab et al, 2016;Dar et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…As per the investigation carried out by Iwasaki and Matsubara (2000), the alginate oligomers with tetramer to hexamer degrees of polymerization exhibited a potent growth-promoting and elicitor effect on plants. Additionally, these oligomers (oligosaccharides) are claimed to reduce the harvest period of different crops, thus curbing the exploitation of chemical fertilizers and insecticides (Darvill et al, 1992;Nagasawa et al, 2000;Ahni et al, 2001;Cabalfin, 2002;Kume et al, 2002;Hafiz et al, 2003;Lee et al, 2003;Luan et al, 2003;Sabharwal, 2004;Hu et al, 2004;El-Mohdy, 2012). Furthermore, irradiated sodium alginate (ISA) is well known for its agricultural use, the verification of which comes from studies claiming that foliar application of ISA results in the amelioration of active constituents in various medicinal and aromatic plants (MAPs) (Naeem et al, , 2012Idrees et al, 2012;Aftab et al, 2014;.…”

Section: Introductionmentioning

confidence: 99%

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Regulation of functional activities and essential oil production in Vetiveria zizanioides L. Nash after γ-irradiated sodium alginate elicitation

Shabbir¹,

Khan²,

Sadiq³

et al. 2017

Turk J Biol

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Upon irradiation, marine polysaccharides undergo depolymerization, leading to formation of oligosaccharides that elicit various biological activities in plants. Taking a step further on the previously established growth-promoting activity of irradiated sodium alginate (ISA), structural rearrangements in ISA were analyzed using complementary techniques to develop an understanding of the structure-property relationship. The essential oil (EO) of vetiver (Vetiveria zizanioides L. Nash) immensely benefits the perfumery industry, proving itself as an economically important crop. A pot experiment was designed to test the effect of water-soluble ISA fractions on the growth, physiology, and EO production of vetiver. The structural characterization of radiation-induced sodium alginate was carried out using SEM, FT-IR, and UV-Vis spectroscopy. Of the various treatments employed, ISA-120 (ISA applied at 120 mg L -1 ) proved the best for most of the parameters studied, including fresh and dry weight of plants and photosynthetic attributes. As compared to the control (water-spray treatment), foliar feeding of ISA-120 resulted in an increase of 21.2% in chlorophyll content, while this treatment enhanced the chlorophyll fluorescence by 21.8% at 300 days after transplanting. Application of ISA-120 also increased the EO content by 21.1% and EO yield by 47.6%. Gas chromatography revealed an increase of 30.1% and 92.6% in the values of content and yield of khusimol, respectively, over the control.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regulation of functional activities and essential oil production in Vetiveria zizanioides L. Nash after γ-irradiated sodium alginate elicitation

Shabbir¹,

Khan²,

Sadiq³

et al. 2017

Turk J Biol

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“…Ultrasonic, ultraviolet, and gamma irradiation are widely used for alginate degradation. In terms of energy efficiency, gamma irradiation is considered to be one of the most effective degradation methods (Abd El‐Mohdy, ). Alginate depolymerization by radiation does not need special control of temperature, environment, or additives (Abd Ei‐Mohdy, ).…”

Section: Production Of Aosmentioning

confidence: 99%

Alginate Oligosaccharides: Production, Biological Activities, and Potential Applications

Liu

Yang

et al. 2019

Comp Rev Food Sci Food Safe

227

121

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Alginate, a group of polyuronic saccharides, has been widely used in both pharmaceutical and food industries due to its unique physicochemical properties as well as beneficial health effects. However, the potential applications of alginate are restricted because of its low water solubility and high solution viscosity when significant concentrations are needed, particularly in food products. Alginate oligosaccharides (AOS), oligomers containing 2 to 25 monomers, can be obtained via hydrolysis of glycosidic bonds, organic synthesis, or through biosynthesis. Generally, AOS have shorter chain lengths and thus improved water solubility when compared with higher molecular weight alginates of the same monomers. These oligosaccharides have attracted interest from both basic and applied researchers. AOS have unique bioactivity and can impart health benefits. They have shown immunomodulatory, antimicrobial, antioxidant, prebiotic, antihypertensive, antidiabetic, antitumor, anticoagulant, and other activities. As examples, they have been utilized as prebiotics, feed supplements for aquaculture, poultry, and swine, elicitors for plants and microorganisms, cryoprotectors for frozen foods, and postharvest treatments. This review comprehensively covers methods for AOS production from alginate, such as physical/chemical methods, enzymatic methods, fermentation, organic synthesis, and biosynthesis. Moreover, current progress in structural characterization, potential health benefits, and AOS metabolism after ingestion are summarized in this review. This review will discuss methods for producing and modified AOS with desirable structures that are suited for novel applications.

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Sustainable Nanobiocomposites

Shah

Patel

Chavda

et al. 2022

Sustainable Nanotechnology

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Radiation-induced degradation of sodium alginate and its plant growth promotion effect

Cited by 83 publications

References 30 publications

Regulation of functional activities and essential oil production in Vetiveria zizanioides L. Nash after γ-irradiated sodium alginate elicitation

Regulation of functional activities and essential oil production in Vetiveria zizanioides L. Nash after γ-irradiated sodium alginate elicitation

Alginate Oligosaccharides: Production, Biological Activities, and Potential Applications

Sustainable Nanobiocomposites

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