FT-IR spectroscopy showed the involvement biomolecules present in the extract of seaweed K. alvarezii, which were verified in the synthesizing process of Fe3O4-NPs.
Diverse shapes of nanoparticles such as hexagon, truncated triangle and triangle can also be synthesized using the extract of seaweed, Sargassum sp., at room temperature.
Therefore, it may be concluded that the extract of seaweed can be used as gel enhancer in lesser sardine surimi with coincidental increase in texture likeness and had no negative effect on colour and odour likeness.
Further, liquid extract of seaweed was also subjected for estimation of auxin (Gordon and Paleg 1957), gibberellin (Graham and Henderson 1961) and cytokinin (Syono and Torrey 1976) using standard methods.
(0.1 mM) solution in methanol was added to 3 ml of methanolic extract of seaweed (100 μg/ml) in water, shaken vigorously, allowed to stand at RT for 30 min and the absorbance was measured at 517 nm in a UV- visible spectrophotometer U-28000 model, Hitachi, Japan).
The % yield of the methanolic extract of G. acerosa, G. edulis, T. conoides, P. gymnospora, C. hornemanni, H. pannosa, D. dichotoma, J. rubens, S. wightii and Haligra sps were 4.5%, 1.5%, 5%, 3.5%, 1%, 4%, 11 %, 2, 5% and 5% respectively The free randcal scavenging activity of alcoholic extract of seaweed was assessed by the DPPH assay.
Recently, Choi et al. [ 28] also demonstrate a decrease in the viability of macrophages when treated with 400 μg/mL of methanolic extract of another seaweed Ecklonia cava.
The methanolic extract of brown seaweeds such as Ecklonia cava [ 21] and Hizikia fusiformis [ 22] exhibit potent antioxidant activity.
In brinjal plants, there was a noticeable increase in biochemical parameters when 1.5%% of seaweed liquid extract of S. marginatum applied to brinjal plant.
Similarly, in our study, the increased growth of brinjal plants could be associated with the occurrence of some growth promoting substances present in the seaweed extract of S. marginatum as in other macro algal extract (Mooney and Van Staden 1986).
Methanolic extract of three Indian brown seaweeds (Turbinaria conoides, Padina tetrastomatica, and Sargassum marginatum) had different DPPH radical scavenging activities.
