Post-harvest cultivation with seafood process waters improves protein levels of Ulva fenestrata while retaining important food sensory attributes

Kristoffer Stedt, Sophie Steinhagen, Joao Trigo, Barbro Kollander, Ingrid Undeland, Gunilla Toth, Karin Wendin, Henrik Pavia

Forskningsoutput: TidskriftsbidragArtikelPeer review

15 Nedladdningar (Pure)

Sammanfattning

Seaweed aquaculture can provide the growing human population with a
sustainable source of proteins. Sea-based cultivation is an effective method
for farming seaweeds on a large scale and can yield high biomass output.
However, the quality and biochemical composition of the biomass is seasonally
dependent, which limits the harvests to certain periods of the year. Here we
show the possibility to extend the sea-based cultivation season of Ulva
fenestrata when aiming for high protein levels, by post-harvest treatment in
herring production process waters. We harvested U. fenestrata at an optimal
period in terms of yield, but suboptimal in terms of protein content. We then
cultivated the seaweed in onshore tank systems with the nutrient-rich process
waters for 14 days. We monitored biomass yield, crude protein content, amino
acid composition, and content of the health concerning metals arsenic,
mercury, lead, and cadmium, as well as the sensory properties of the dried
biomass. After cultivation in the process waters, biomass yields were 30 - 40%
higher (210 – 230 g fresh weight) compared to in seawater (160 g fresh weight).
Also, the crude protein and amino acid content increased three to five times in
the process waters, reaching 12 - 17 and 15 – 21% dry weight, respectively. The
protein enriched biomass followed food graded standards for heavy metal
content, and consumption of the biomass does not exceed health based
reference points. Additionally, no sensory attributes regarded as negative
were found. This rapid, post-harvest treatment can help extend the
cultivation season of sea-based seaweed farms, maximizing their output of
sustainable proteins.
OriginalspråkEngelska
Artikelnummer991359
Sidor (från-till)1-12
Antal sidor12
TidskriftFrontiers in Marine Science
Volym9
DOI
StatusPublicerad - 2022-sep.-26

Nationell ämneskategori

  • Livsmedelsvetenskap (40103)

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