Seasonal changes in the chemical and gelling characteristics of agar from Gracilaria verrucosa collected in Turkey

Yenig�l, Mesut

doi:10.1007/bf00049081

Cited by 19 publications

(3 citation statements)

References 21 publications

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“…This study also supports the report of Kakita et al [2]. Some researcher studied that low water temperature may a requisite for high gel strength and low salinity for good agar [46][47][48][49][50][51][52][53]. Further, the present study suggests that the agar quality can be 8 enhanced more for the commercial exploitation using the protocol of [54].…”

Section: Analysis Of Agarsupporting

confidence: 91%

Study of Morphology and Agar Contents in Some Important <i>Gracilaria</i> Species of Indian Coasts

Sahu¹

2013

AJPS

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This study reports the morphological, anatomical and agar content difference among various species of Gracilaria. The cortex was found 1-2 layered in G. edulis and G. eucheumatoides whereas 5-6 layered in G. foliifera and G. crassa. The medulla was 6-8 layered in G. edulis, 10-11 layered in G. foliifera, 14-15 layered in G. eucheumatoides and 8-10 layered in G. crassa. Similarly, distinct variations were observed in the structure of cystocarp of these taxa. The outer pericarp was 6-8 layered in G. verrucosa (attached type), 8-9 in Graciriopsis megaspora, 12-13 layered cells in G. edulis, 9-11 layered in G. foliifera, 12-15 layered in G. eucheumatoides and 11-14 layered in G. crassa. The tubular nutritive filaments were radiating type in G. edulis whereas these were penetrating and radiating type in G. foliifera. In G. crassa, the same was produced from a small swollen short base and in G. verrucosa (attached type) it was long. Further, in G. eucheumatoides and Gracilariopsis megaspore, nutritive filaments were not observed. Among various species of Gracilariales studied in this work, agar from Gracilaria verrucosa (floating type or sterile type) showed highest yield with gel strength 260 gm/cm 2 and viscosity 10 milipass. Based on the agar quality, in-vitro culture study was done on G. verrucosa. This study confirms Gracilariales as important indigenous seaweed which can be taken for large scale cultivation tool.

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Section: Analysis Of Agarsupporting

confidence: 91%

Study of Morphology and Agar Contents in Some Important <i>Gracilaria</i> Species of Indian Coasts

Sahu¹

2013

AJPS

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“…On the other hand, the occurrence of different sugars such as the glucose and xylose in the agar extracts is considered as a contamination (Yenigul 1993). Therefore, it could affect rheological properties.…”

Section: Discussionmentioning

confidence: 99%

Effects of depth and initial fragment weights of Gracilaria gracilis on the growth, agar yield, quality, and biochemical composition

et al. 2018

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phycoerythrin is considered to be a predominant pigment in red algae. This pigment is at present used in food industry as colorant. Nevertheless, because of the spectral properties, it is used mainly in clinical and immunological analysis (Mensi et al.2012), in fluorescence microscopy and flux cytometry (Glazer and Stryer 1984;Kronick 1986). It is also reported that R-phycoerythrin and phycocyanin act as a part of protective mechanism in seaweeds in general (Sinha et al.1995) and in Gracilaria caudata particularly (Araujo et al.2014). To our best knowledge, few studies (Molloy and Bolton 1996;Mensi et al. 2009) were published regarding the effect of both depth and initial fragment weights on growth and proximate chemical composition of Gracilaria gracilis (previously known as G. verrucosa).Presently, there are neither large scale seaweed cultivation nor agar industry in Tunisia.Nevertheless, several attempts of Gracilaria farming were performed in the two last decades, using both spores (Ben Said and Aouini 2014) and cuttings/fragments (Ksouri et al.1999(Ksouri et al. , 2000 Mensi et al.2009). Four farming methods were used: ropes, sand filled plastic tubes, spade and suspended system in hoop-nets. On the other hand, some experimental agar extractions have been carried out on Gracilaria gracilis (Ben Said and Ksouri 1999; Ben Said et al.2015).This study aimed to determine the ability of Gracilaria gracilis to be cultivated at two different water depths in Bizerte lagoon, using net pockets. Additionally, relatively low initial fragment weights, compared with previously reported studies (Ksouri et al.1999(Ksouri et al. , 2000 Mensi et al.2009) were also tested in order to have an appreciable biomass with a high daily growth rate (DGR) in relation to environmental factors. The biomass could be firstly used for agar extraction and secondly for other potentially interesting compounds. Hence, agar yield, gel strength, gelling and melting temperatures were investigated because of their properties to

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“…46 However, to date, there have been no published reports on EF made from this species. Characterizations of agar have been based on differences in cultivation and geographical area, 47,48 species, 39 seasonal variation, 47 environmental factors 49 and the extraction process 50 ; thus, it is of interest to investigate the influence of the species, G. fisheri on the properties of polysaccharide in applications, such as an EF.…”

Section: Introductionmentioning

confidence: 99%

Edible‐algae base composite film containing gelatin for food packaging from macroalgae, Gracilaroid (Gracilaria fisheri)

Boonprab,

Chirapart,

Effendy

2024

J Sci Food Agric

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BackgroundConventional petroleum‐based packaging films cause severe environmental problems. In this work bio‐edible film as a safe to replace petroleum‐based polymers was introduced. A food application for edible sachets and a composite edible film (EF) from marine algae, Gracilaria fisheri (GF) extract were proposed.ResultsCarbohydrates were the most prevalent component in fresh GF fronds. Under neutral conditions at 90 °C for 40 min, the extract's structure was determined by FTIR to be a carrageenan‐like polysaccharide. Glycerol was the best plasticizer for EF formation since it had the highest tensile strength (TS). The integration of gelatin into the algal composite film with gelatin (CFG) was validated by significant. The best casting temperatures for 2 h were 70 and 100 °C among the four tested temperatures (25, 60, 70, and 100 °C). Temperatures did not result in significant (p ≤ 0.05) differences in any character (color values, TS, water vapor permeability, oxygen transmission, thickness, and water activity), except elongation at break. Visually, the CFG had a slightly yellow appearance. The best‐to‐worst order of film stability in the three tested solvents was oil, distilled water (DW), and ethanol. Its stability in ethanol (0–100%), temperature of DW (30–100 °C), and pH (3–7 in DW) demonstrated inverse variations with the concentration or different conditions, except for pH 8–10 in DW. All treatments were significantly (p ≤ 0.05) different.ConclusionThe novel material made from polysaccharides from algae, G. fisheri, was used to improve EF. The edible sachet application was plausible from the EF.This article is protected by copyright. All rights reserved.

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Seasonal changes in the chemical and gelling characteristics of agar from Gracilaria verrucosa collected in Turkey

Cited by 19 publications

References 21 publications

Study of Morphology and Agar Contents in Some Important <i>Gracilaria</i> Species of Indian Coasts

Study of Morphology and Agar Contents in Some Important <i>Gracilaria</i> Species of Indian Coasts

Effects of depth and initial fragment weights of Gracilaria gracilis on the growth, agar yield, quality, and biochemical composition

Edible‐algae base composite film containing gelatin for food packaging from macroalgae, Gracilaroid (Gracilaria fisheri)

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Seasonal changes in the chemical and gelling characteristics of agar from Gracilaria verrucosa collected in Turkey

Cited by 19 publications

References 21 publications

Study of Morphology and Agar Contents in Some Important &lt;i&gt;Gracilaria&lt;/i&gt; Species of Indian Coasts

Study of Morphology and Agar Contents in Some Important &lt;i&gt;Gracilaria&lt;/i&gt; Species of Indian Coasts

Effects of depth and initial fragment weights of Gracilaria gracilis on the growth, agar yield, quality, and biochemical composition

Edible‐algae base composite film containing gelatin for food packaging from macroalgae, Gracilaroid (Gracilaria fisheri)

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Product

Resources

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Study of Morphology and Agar Contents in Some Important <i>Gracilaria</i> Species of Indian Coasts

Study of Morphology and Agar Contents in Some Important <i>Gracilaria</i> Species of Indian Coasts