Indigestible fraction of edible marine seaweeds

Rupérez, Pilar; Toledano, Gema

doi:10.1002/jsfa.1536

Cited by 37 publications

(18 citation statements)

References 27 publications

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“…Pro-and prebiotics, e.g., Lactobacillus and dietary fiber, improve the bowel movements [26,27]. Seaweed is a rich source of dietary fibers such as arginic acid, fucoidan and laminaran [28]. in the numbers of bifidobacteria after wakame intake and a significant decrease in the amount of faecal ammonia during alginate consumption [31].…”

Section: Discussionmentioning

confidence: 99%

Effects of Undaria pinnatifida (wakame) on the human intestinal environment

Yoshinaga¹,

Maruya²,

Koikeda³

et al. 2018

FFHD

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Background: Undaria pinnatifida (wakame) is an edible seaweed. Wakame is a common food in the Japanese diet which exhibits various biological effects. Wakame is rich in dietary fiber. Despite the long history of its intake, changes in the intestinal environment following the ingestion of wakame are unclear.Methods: We examined the effect of a 2-week intake of wakame on defecation frequency and the intestinal microbiota of 22 healthy individuals suffering from low defecation frequency. The clinical trial was designed as an open-label study.Results: Defecation frequency, defined in terms of times per week, days per week, and volume per week significantly increased during the wakame intake period. Furthermore, based on terminal restriction fragment length polymorphism (T-RFLP), the fraction of bifidobacteria as a percentage of all fecal bacteria increased significantly during the wakame intake period. At the phylum, next-generation sequencing (NGS) revealed that the relative abundance of Actinobacteria after wakame intake significantly increased while the abundance of Bacteroidetes decreased. Moreover, species-level analyses revealed that the abundance of Bifidobacterium longum increased significantly after wakame intake. B. longum colony counts on wakame-containing medium were significantly higher than those on medium without wakame.Conclusion: These observations suggest that wakame intake improves intestinal environment and increases the fecal population of bifidobacteria, indicating that it may have prebiotic properties.Keywords: Undaria pinnatifida; wakame; bowel movement; intestinal microbiota; fiber; Bifidobacterium

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Section: Discussionmentioning

confidence: 99%

Effects of Undaria pinnatifida (wakame) on the human intestinal environment

Yoshinaga¹,

Maruya²,

Koikeda³

et al. 2018

FFHD

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“…Thus, there was an interference effect that could not be eliminated by dilution or by using the standard addition method. Seaweeds have high contents of minerals, proteins and fibre, 24 compounds that are highly solubilized after in vitro digestion, 25,26 and these might by responsible for the matrix interference effect.…”

Section: Arsenic(iii) and Arsenic(v) In Soluble Fractionsmentioning

confidence: 99%

Bioaccessibility of inorganic arsenic species in raw and cooked Hizikia fusiforme seaweed

Laparra

Vélez

Montoro

et al. 2004

Applied Organom Chemis

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Samples of Hizikia fusiforme edible seaweed, a commercially available dried food with high concentrations of total arsenic (t-As) and inorganic arsenic (i-As), both raw and cooked (boiling at 100 • C, 20 min), were selected for the bioaccessibility study. Cooking caused a significant reduction in the concentrations of t-As (30-43%) and i-As (46-50%), despite which the i-As contents in the cooked product were high (42.7-44.6 µg g −1 seaweed). An in vitro gastrointestinal digestion (pepsin, pH 2, and pancreatin-bile extract, pH 7) was applied to the seaweed to estimate arsenic bioaccessibility (maximum soluble concentration in gastrointestinal medium) of t-As, i-As, arsenic(III) and arsenic(V). The influence of the gastric and intestinal stages of the in vitro digestion method was evaluated. The gastric stage is the key stage in the solubilization of both t-As and i-As. The bioaccessible i-As in raw seaweed (54.0-66.5%) increases after cooking (78.3-84.4%), a fact that is considered to be of interest because this is the usual form in which this seaweed is ingested. Speciation of the i-As in the bioaccessible fraction revealed a different arsenic(III)/arsenic(V) relationship in the product when raw or cooked. When raw, the majority species was arsenic(III) after either the gastric or the gastrointestinal stage, whereas in the cooked product it depended on the batch analysed, with bioaccessible arsenic(III) contents of 7.1-25.4 µg g −1 of dried seaweed, which represents 5-17% of the i-As tolerable daily intake.

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“…The most important polysaccharides found to be generally present in red algae are sulphated galactans (Rupe´rez & Toledano 2003). Porphyran is the principle sulphated galactan occurring in Porphyra spp.…”

Section: Aquaculture Nutritionmentioning

confidence: 99%

Effects of low and medium levels of red alga Nori (Porphyra yezoensisUeda) in the diets on growth, feed utilization and metabolism in intensively fed Nile tilapia,Oreochromis niloticus(L.)

et al. 2012

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A 10‐week feeding experiment was conducted in a respirometric system to evaluate the suitability of red alga Nori (Porphyra yezoensis) as a partial replacement for fish meal in intensively fed Nile tilapia. Diets were formulated to be iso‐nitrogenous and iso‐energetic and to replace 0%, 15% and 30% fish meal with Nori, P. yezoensis. No statistically significant differences in growth or feed utilization between the control diet and either Nori diet were found. Tilapia fed on Nori 15 increased their body mass by 415%, those fed the control diet by 341% and fish fed Nori 30 by 317% over the experimental period. Nori 15 fed fish showed the best feed utilization, highest metabolic growth rate and significantly lower oxygen consumption rates than the control. Both Nori supplemented groups (Nori 15: 4.1 g O2 g−1 protein gain and Nori 30: 3.9 g O2 g−1 protein gain) used less oxygen per gram of protein gain compared to fish fed the control diet (5.4 g O2 g−1 protein gain). Our results show that a low replacement level (15%) of fish meal with Nori improves growth and feed utilization while oxygen consumption and amount of oxygen consumed per gram protein gain are significantly decreased.

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Indigestible fraction of edible marine seaweeds

Cited by 37 publications

References 27 publications

Effects of Undaria pinnatifida (wakame) on the human intestinal environment

Effects of Undaria pinnatifida (wakame) on the human intestinal environment

Bioaccessibility of inorganic arsenic species in raw and cooked Hizikia fusiforme seaweed

Effects of low and medium levels of red alga Nori (Porphyra yezoensisUeda) in the diets on growth, feed utilization and metabolism in intensively fed Nile tilapia,Oreochromis niloticus(L.)

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