Binding of inorganic elements to kelp residues

Rosell, Karl-Gunnar; Srivastava, Lalit M.

doi:10.1007/bf00027733

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…Most iodine is water-soluble (I − and IO 3 − ) and can be completely removed after leaching thrice [101]. Non-water soluble iodine is mainly bound to different proteins, cellulosic materials, fucoidan, alginic acid and polyphenols [103,104]. Hou et al [101] reported that the major portion of iodine in seaweed is iodide (I − ) accounting for 60% of total soluble iodine and more than 94% of inorganic iodine, while the content of IO 3 − is low.…”

Section: Iodinated Compoundsmentioning

confidence: 99%

The Effects of Halogenated Compounds on the Anaerobic Digestion of Macroalgae

et al. 2020

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The urgent need to replace fossil fuels has seen macroalgae advancing as a potential feedstock for anaerobic digestion. The natural methane productivity (dry weight per hectare) of seaweeds is greater than in many terrestrial plant systems. As part of their defence systems, seaweeds, unlike terrestrial plants, produce a range of halogenated secondary metabolites, especially chlorinated and brominated compounds. Some orders of brown seaweeds also accumulate iodine, up to 1.2% of their dry weight. Fluorine remains rather unusual within the chemical structure. Halogenated hydrocarbons have moderate to high toxicities. In addition, halogenated organic compounds constitute a large group of environmental chemicals due to their extensive use in industry and agriculture. In recent years, concerns over the environmental fate and release of these halogenated organic compounds have resulted in research into their biodegradation and the evidence emerging shows that many of these compounds are more easily degraded under strictly anaerobic conditions compared to aerobic biodegradation. Biosorption via seaweed has become an alternative to the existing technologies in removing these pollutants. Halogenated compounds are known inhibitors of methane production from ruminants and humanmade anaerobic digesters. The focus of this paper is reviewing the available information on the effects of halogenated organic compounds on anaerobic digestion.

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Section: Iodinated Compoundsmentioning

confidence: 99%

The Effects of Halogenated Compounds on the Anaerobic Digestion of Macroalgae

et al. 2020

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Iodine contributes to osmotic acclimatisation in the kelp Laminaria digitata (Phaeophyceae)

Nitschke

Stengel

2013

Planta

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Iodide (I⁻) retained by the brown macroalga Laminaria digitata at millimolar levels, possesses antioxidant activities, but the wider physiological significance of its accumulation remains poorly understood. In its natural habitat in the lower intertidal, L. digitata experiences salinity changes and osmotic homeostasis is achieved by regulating the organic osmolyte mannitol. However, I⁻ may also holds an osmotic function. Here, impacts of hypo- and hypersaline conditions on I⁻ release from, and accumulation by, L. digitata were assessed. Additionally, mannitol accumulation was determined at high salinities, and physiological responses to externally elevated iodine concentrations and salinities were characterised by chl a fluorometry. Net I⁻ release rates increased with decreasing salinity. I⁻ was accumulated at normal (35 S A) and high salinities (50 S A); this coincided with enhanced rETRmax and qP causing pronounced photoprotection capabilities via NPQ. At 50 S A elevated tissue iodine levels impeded the well-established response of mannitol accumulation and prevented photoinhibition. Contrarily, low tissue iodine levels limited photoprotection capabilities and resulted in photoinhibition at 50 S A, even though mannitol was accumulated. The results indicate a, so far, undescribed osmotic function of I⁻ in L. digitata and, thus, multifunctional principles of this halogen in kelps. The osmotic function of mannitol may have been substituted by that of I⁻ under hypersaline conditions, suggesting a complementary role of inorganic and organic solutes under salinity stress. This study also provides first evidence that iodine accumulation in L. digitata positively affects photo-physiology.

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