Trace element ratios in tooth enamel as palaeodietary indicators of seaweed consumption and coastal grazing, and their broader applicability

Blanz, Magdalena; Stewart, Samuel; Mainland, Ingrid; Ascough, Philippa; Raab, Andrea; Feldmann, Jörg; Taggart, Mark A.

doi:10.1016/j.jas.2022.105551

Cited by 4 publications

(3 citation statements)

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“…Samples of concentrate feed without seaweed were collected (and stored at −18 °C) in experimental Weeks P3, 3, 5 and 8 (n = 4), while samples of concentrate feed with seaweed were collected in Weeks 1, 3 and 5 (n = 3). The full profile of macrominerals, trace elements and heavy metals, as well as the chemical composition of the experimental diets, for the weeks that seaweed was part of LSW and HSW diets (1)(2)(3)(4)(5)(6), have been previously presented by Newton et al 16 Chemicals, reagents, and standards Water (18.2 MΩ cm) was obtained from a Milli-Q Academic Ultrapure Water System (Millipore GmbH, Vienna, Austria). Methanol (≥99.9%, MeOH), formic acid (≥98%) and nitric acid (HNO 3 , 68%, further purified in a duoPUR sub-boiling unit, MLS GmbH, Leutkirch, Germany) were obtained from Carl Roth GmbH (Karlsruhe, Germany).…”

Section: Experiments Designmentioning

confidence: 99%

“…Seaweed has had a tradition of being part of the animal feed in coastal areas since ancient times. 1,2 It is currently an underexploited resource where it may have a beneficial effect on animals due to valuable components including proteins, lipids, minerals, vitamins, enzymes and bioactive compounds. 3,4 Certain seaweeds have been shown to have the ability to reduce methane production from cattle, 5,6 and have further been used as nutritional antibiotics.…”

Section: Introductionmentioning

confidence: 99%

“…Seaweed has had a tradition of being part of the animal feed in coastal areas since ancient times 1,2 . It is currently an underexploited resource where it may have a beneficial effect on animals due to valuable components including proteins, lipids, minerals, vitamins, enzymes and bioactive compounds 3,4 .…”

Section: Introductionmentioning

confidence: 99%

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Speciation of arsenic in milk from cows fed seaweed

Xiong,

Petursdottir,

Rikhardsson

et al. 2024

J Sci Food Agric

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BackgroundIncluding seaweed in cattle feed has gained increased interest, but it is important to take into account that the concentration of toxic metals, especially arsenic, is high in seaweed. This study investigated the arsenic species in milk from seaweed‐fed cows.ResultsTotal arsenic in milk of control diets (9.3 ± 1.0 μg As kg−1, n = 4, dry mass) were significantly higher than seaweed‐based diet (high‐seaweed diet: 7.8 ± 0.4 μg As kg−1, p < 0.05, n = 4, dry mass; low seaweed diet: 6.2 ± 1.0 μg As kg−1, p < 0.01, n = 4, dry mass). Arsenic speciation showed that the main species present were arsenobetaine (AB) and arsenate (As(V)) (37% and 24% of the total arsenic, respectively). Trace amounts of dimethylarsinic acid (DMA) and arsenocholine (AC) have also been detected in milk. Apart from arsenate being significantly lower (p < 0.001) in milk from seaweed‐fed cows, than in milk from the control group, other arsenic species showed no significant differences between groups.ConclusionThe lower total arsenic and arsenate in seaweed diet groups indicates a possible competition of uptake between arsenate and phosphate and the presence of AC indicates a reduction of AB occurred in the digestive tract. Feeding a seaweed blend (91% Ascophyllum nodosum and 9% Laminaria digitata) does not raise As‐related safety concerns for milk.This article is protected by copyright. All rights reserved.

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