Wednesday, March 27, 2024

 

NGO T&E Alleges Carriers Are Profits from EU ETS Overcharging Shippers

EU port
Starting in 2024 the EU introdcued its ETS system to charge shipping companies for their carbon emissions (Rotterdam file photo)

PUBLISHED MAR 26, 2024 5:57 PM BY THE MARITIME EXECUTIVE

 

 

The activist NGO Transport & Environment (T&E) issued a new study contending the major shipping carriers are “profiteering from the EU carbon emission charges,” introduced at the beginning of 2024. They are claiming the surcharges introduced by the carriers are more than the actual cost to the shipping companies from the new measures, while the major shipping companies cited in the report quickly responded saying the group’s study used inaccurate and incomplete data.

The EU became the first major region to impose fees on the shipping lines for their carbon emissions. The highly controversial action that caused a heated political debate was introduced this year and is being phased in over the next few years. Initially, the fee is being imposed on 40 percent of carbon emissions and steps up to 70 percent and then 100 percent in 2026.

Major carriers responded by introducing a surcharge fee for all shipments into the region. The carriers have said they would continue to access the fees and update them quarterly to reflect the actual prices charged by the EU and their experience with the costs of the ETS. 

T&E however analyzed 565 voyages from 20 different ships from Europe’s four largest carriers, Maersk, MSC, CMA CMG, and Hapag-Lloyd. While the report recognizes that the expenses of each voyage fluctuate, T&E contends that in 90 percent of the voyages it analyzed the carriers are charging customers more than the actual cost of the EU ETS. 

“Far from avoiding the ETS, shipping companies appear to be profiting from it,” alleges the report. They contend that Maersk is averaging a profit of as much as €60,000 per voyage while MSC realizes an average of €25,000, Hapag-Lloyd €23,000, and CMA CGM €14,000. They said that the individual profit may not be that high on a voyage while alleging on one trip Maersk was likely to make €325,000 extra from the fees.

Maersk responded saying the report is flawed and uses inaccurate and selective data. They called the methodology “flawed,” for the report while noting that the uses outdated surcharge estimates. The price of carbon has not been announced but T&E said in its footnotes that it used a “conservative estimate” based on an official carbon price of €90, which is higher than the current ETS price of €64.95.

“Economies of scale mean the shipping business can absorb pretty large price shocks. The Red Sea disruption is pretty much as bad as it gets and global trade still hasn’t ground to a halt. The ETS is peanuts in comparison,” said Jacob Armstrong in defense of the new policy. He concluded that “Cost is not a barrier to shipping decarbonization when the most ambitious green measures would add just cents to most consumer goods.”

Further, he seeks to dissuade the argument, especially of southern European ports, that shipments would be diverted to transshipment ports across the Mediterranean to avoid some of the fees. During the formulation of the ETS system, special consideration was taken into account to designate transshipment ports.

Armstrong responds, “Southern European governments are warning that the ETS will cost them business by ships evading their ports, but why would they if they’re making money from it?” 

He also argues that shipping costs have a marginal impact on the final cost of goods. He contends that this permits the carriers to charge the surcharges without fear from customers. 

T&E was a strong advocate for the EU ETS saying that the initiatives did not go far enough and needed to be faster while they argued that transportation overall is the slowest sector in decarbonization. In this report, T&E concludes that even the most ambitious climate measures would add just cents to most consumer goods.

The shipping industry recognizes that carbon fees are emerging and have called for a universal approach as opposed to piecemeal in individual jurisdictions. ABS Chairman and CEO  Christopher Wiernicki, concluded after the IMO's MEPC meeting last week that a universal, global carbon tax on shipping is coming. The industry and major carriers are working to adapt to the new rules and incorporate them into their operations. Carriers are still working to incorporate the costs into their operations and have promised to review and adapt to the systems.

 

India Joins Chorus of Support for Philippines' Maritime Sovereignty

CCG
A China Coast Guard cutter deploys its water cannon to ward off a Philippine supply convoy (Philippine Coast Guard)

PUBLISHED MAR 26, 2024 6:53 PM BY THE MARITIME EXECUTIVE

 

India has joined the chorus of support for Philippine maritime rights in the South China Sea, and China is pushing back. 

On Tuesday, top Indian diplomat S. Jaishankar visited Manila to express firm support for the Philippines' sovereignty and to explore opportunities for defense cooperation. 

"It is essential that India and the Philippines cooperate more closely to shape the emerging world," Jaishankar said at a press conference.  "It's natural today that two countries whose trust and comfort is growing so rapidly that we will look at various new areas of cooperation. And certainly defense and security is one of them."

The Philippines is ordering India's BrahMos supersonic anti-ship missile system, and deliveries are expected to start as early as this month

Manila has sharply criticized China for its interference in the Philippine exclusive economic zone. The two sides' coast guards and fishing fleets often face off at disputed reefs, particularly at Second Thomas Shoal, where the Philippine military maintains a small garrison to prevent Chinese incursions. Just last weekend, Philippine mariners were injured when the China Coast Guard used water cannons to turn back a supply convoy headed for this outpost.

The U.S., EU, Japan, and many Western governments have expressed support for the Philippines' claims, and have criticized China's desire to annex a segment of the Philippine EEZ. China, for its part, has said that it would prefer to negotiate with the Philippines alone, without the support of its allies. 

“Maritime disputes are issues between countries concerned and any third party is not in a position to interfere,” Chinese Foreign Ministry spokesperson Lin Jian said Tuesday, in reference to India's statement of support. “We urge the relevant side to face facts of the issues of the South China Sea, respect the sovereignty and maritime interests of China and the efforts made by the regional countries in upholding peace and stability in the South China Sea."

China claims the vast majority of the South China Sea as its own, including Second Thomas Shoal and other features within the Philippines' 200-nautical-mile EEZ line. In 2016, the Permanent Court of Arbitration in the Hague ruled that China's claims were not consistent with international maritime law, and it issued a judgement in favor of the Philippines. China did not participate in the proceeding and has ignored the outcome. 


New Video Shows Damage From China Coast Guard's Water Cannon Attack

China Coast Guard cutters water cannon a Philippine supply boat
Image courtesy Armed Forces of the Philippines

PUBLISHED MAR 25, 2024 10:50 PM BY THE MARITIME EXECUTIVE

 

A new video obtained by media outlet GMA shows the extensive damage that the China Coast Guard inflicted on a Philippine supply boat near Second Thomas Shoal last weekend. The Unaizah May 4 was hit repeatedly by high-power water cannons, breaking the windows on the bridge, soaking the upper deck level and injuring multiple crewmembers. It is the second time that Philippine servicemembers have been injured by Chinese forces at the reef.

On Saturday morning, CCG cutters and Chinese maritime militia vessels worked to block a convoy consisting of two PCG cutters and the supply boat Unaizah May 4, according to the Philippine Coast Guard. The Chinese vessels used water cannon to disable the Unaizah May, and video shows powerful water jets blasting through the upper deck level of the supply boat, lashing the crew and jumbling their cargo. The footage shows extensive interior damage, including serious damage to the pilothouse. 

The supply boat required assistance from a nearby Philippine Coast Guard cutter, and it did not complete its mission. (A RIB launch did carry six personnel and a small quantity of cargo to the destination, the outpost on Second Thomas Shoal, according to the PCG.)

The altercation drew protests from Manila. The Philippine Department of Foreign Affairs summoned China's ambassador on Monday to convey its "strong protest against the aggressive actions undertaken by the China Coast Guard." It also demanded that China withdraw its vessels from the area around Second Thomas Shoal, which is within the Philippine exclusive economic zone.  

"China's aggressive actions call into question its sincerity in lowering the tensions and promoting peace and stability in the South China Sea," the ministry said in a statement. 

China claims the vast majority of the South China Sea as its own, including Second Thomas Shoal and other features within the Philippines' 200-nautical-mile EEZ line. In 2016, the Permanent Court of Arbitration in the Hague ruled that China's claims were not consistent with international maritime law, but Beijing refuses to recognize the court's legitimacy. 

“If China is not afraid to state its claims to the world, then why don’t we arbitrate under international law?” Philippine defense minister Locsin Teodoro told reporters in Manila on Monday. “No country believes [their claims]."

 CANADA

After Long Battle, Davie Secures its National Shipbuilding Strategy Order

Davie Shipyard icebreaker
Illustration courtesy Davie Shipyard

PUBLISHED MAR 26, 2024 10:53 PM BY THE MARITIME EXECUTIVE

 

Davie Shipbuilding has secured its first contract under Canada's National Shipbuilding Strategy (NSS) for the design of the Canadian Coast Guard's six-ship Program Icebreaker series. The award vindicates Davie's decade-long effort to become a designated NSS shipyard and secure a share of the program. Details on delivery timeline and vessel cost have not been released.

"The new fleet will be symbolic of Canada’s Arctic presence and crucial to keeping our country open for business year-round," said Public Services Minister Jean-Yves Duclos in a statement.

The contract gives Davie the green light to set up project management and design offices for the Program Icebreaker, launch recruitment efforts to build its team, and begin talks with subcontractors.

Chantier Davie was inducted into the National Shipbuilding Strategy in early 2023, following a three-year period of negotiations on the terms of an umbrella agreement. The yard and the Canadian government have debated over whether the agreement's details may be released

The deal's initial C$8.5 billion phase includes six icebreakers and one polar icebreaker for the Canadian Coast Guard, plus two hybrid ferries. It represents a substantial part of the Canadian Coast Guard's fleet recapitalization program, and is urgently needed to replace aging and hard-to-maintain tonnage for Arctic operations.

The NSS was conceived in the late 2000s as a way to smooth out the boom-and-bust cycles of fleet renewal and provide a steady workflow to shipbuilders. In 2012, Irving Shipbuilding in Halifax won the program's larger "Combat" package, and Seaspan in Vancouver secured the "Non-Combat" package. 

Quebec-based Davie submitted bids for the NSS, but was not initially selected. It still sought ways to compete, and in 2019, the Canadian government reopened the program to new participants. The new tender sought yards qualified for icebreaker construction and ultimately selected Davie.

Davie's previous icebreaker contract - the conversion of three icebreaking offshore vessels for the Canadian Coast Guard - cost more than forecast and delivered later than expected, according to Canadian media. Going forward, the company has the support of icebreaker specialist Helsinki Shipyard, which Davie purchased last year. 

 

Decreases in social disparities in air pollution during lockdown suggest the need for sustainable policies



POHANG UNIVERSITY OF SCIENCE & TECHNOLOGY (POSTECH)
Reducing social inequities in air pollution exposure resulting from lockdown policies 

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REDUCING SOCIAL INEQUITIES IN AIR POLLUTION EXPOSURE RESULTING FROM LOCKDOWN POLICIES

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CREDIT: POSTECH




Is everyone equally affected by environmental pollution? This is the essence of ‘environmental justice,’ a concept that originated in the United States during the 1970s. It revolves around the idea of ensuring fairness and equity in environmental issues, preventing the disproportionate impact of environmental problems on specific groups or regions. The U.S. has made significant progress in reducing air pollution through stringent regulations and policies, turning its attention to addressing social disparities in air quality. However, there remains a gap in environmental justice research in Korea.

 

A research team led by Professor Hyung Joo Lee from the Division of Environmental Science and Engineering at Pohang University of Science and Technology (POSTECH), in collaboration with the California Air Resources Board, conducted a study on the air pollution impact of lockdown policies in the U.S. during the COVID-19 pandemic. The research aimed to analyze how these policies affected social inequities in air pollution exposures and provide insights for formulating environmental justice policies. The findings were published in the international environmental journal Atmospheric Environment.

 

Nitrogen dioxide (NO2), an air pollutant emitted from vehicles and industrial activities, serves as a crucial indicator of combustion-related air pollution. The team investigated the influence of lockdown policies on social disparities in NO2 air pollution.

 

The findings revealed a notable reduction in average NO2 concentrations in California, U.S., by approximately 34% post-lockdown, excluding weather-related influences. Non-urban areas experienced a 17% decrease, while urban areas saw a 50% reduction in NO2 levels, primarily attributed to the significant decline in traffic during the lockdown.

 

Furthermore, the research team analyzed shifts in social inequity related to air pollution, employing an environmental justice perspective. They identified socially vulnerable groups based on education level and race/ethnicity and assessed their exposure to air pollution, noting a substantial decrease in the disparity from 79% to 37%. This reduction was attributed to the fact that disadvantaged communities in the U.S. are more likely to reside in areas with elevated nitrogen oxide (NOx) emissions from vehicles such as diesel trucks, and in close proximity to roads, distribution centers, and ports. Consequently, these communities were more affected by the reduced traffic during the lockdown. The implementation of lockdown policies to curb the spread of the coronavirus not only resulted in a decline in average air pollution levels but also contributed to a reduction in social inequities linked to air pollution. This highlights the potential for policies regulating NOx emissions from internal combustion engines to lower the average concentration of NO2 and simultaneously narrow the disparity of air pollution exposures.

 

The team underscores the importance of learning lessons for future air pollution policies from the experiences in California. While the decrease in social disparities in air pollution exposure during the lockdown might be temporary, persistent reduction in these inequities can be achieved through targeted source controls via air policies. This requires a nationwide analysis of social inequities in exposure to each air pollutant and efforts to tackle the specific sources responsible for these disparities.

 

Professor Hyung Joo Lee stated, "Currently, Korea is primarily focused on lowering the average air pollution levels. He emphasized, “However, the simultaneous reductions of average air pollution levels and social inequities of air pollution are achievable. This can be accomplished by developing policies that incorporate environmental justice principles."

 

The research was conducted with the support from the BK21 FOUR program of the Ministry of Education and the National Research Foundation of Korea.

 

The behavior of ant queens is shaped by their social environment


Specialization of ant queens as mere egg-layers is reversible / Queen behavioral specialization is initiated and maintained by the presence of workers



JOHANNES GUTENBERG UNIVERSITAET MAINZ

black garden ant 

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A BLACK GARDEN ANT QUEEN CARING FOR HER BROOD

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CREDIT: PHOTO/©: ROMAIN LIBBRECHT




The queens in colonies of social insects, such as ants, bees, and wasps, are considered the veritable embodiment of specialization in the animal kingdom. The common perception is that the queen's only task is to lay eggs – and that this attribute is an inherent trait, not influenced by external factors. In contrast, recent research undertaken at Johannes Gutenberg University Mainz (JGU) has demonstrated that in certain ant colonies the social environment can play a crucial role in shaping the behavioral specialization of the queens. "With regard to the ant species we studied, it is social factors that control whether queens become specialized or not. Our findings challenge the widely accepted notion of social insect queens as inherently specialized egg-laying machines," stated Dr. Romain Libbrecht.

The research was conducted by the Reproduction, Nutrition, and Behavior in Insect Societies group at JGU under the supervision of Dr. Romain Libbrecht, an evolutionary biologist. The corresponding paper has recently been published in Functional Ecology. Dr. Romain Libbrecht currently works at the Centre National de la Recherche Scientifique (CNRS) in the Insect Biology Research Institute of the University of Tours.

Concept of insect societies as superorganisms consisting of specialized individuals

It is generally assumed that social insect colonies consist of queens that monopolize reproduction and sterile workers responsible for all non-reproduction-related tasks, such as the care of the brood, i.e., eggs and larvae. Libbrecht's team now questioned this basic assumption. They focused on ant species where the queens found new colonies alone and without the help of workers. "Interestingly, these founding queens are not yet specialized in terms of their behavior at this stage of their lives," Libbrecht pointed out. "They themselves assume all tasks in the nest, such as brood care, to ensure successful production of the first generation of workers."

In their experiments, Libbrecht's group studied the black garden ant Lasius niger that is native to Germany. They found the social environment to be a core factor in determining the behavioral specialization of founding queens. "The introduction of workers in the nests of founding queens suppressed the natural predisposition of the queens to look after their brood themselves. And, conversely, when we isolated queens specialized in egg-laying from their workers, they rapidly reverted to the brood care behavior observed in the case of founding queens, even after many years of specialization."

Revision of the accepted view of the division of labor in insect societies

Libbrecht emphasized that the behavior observed during the study challenges the traditional view of social insect queens as being intrinsically specialized in egg production. Instead, the findings demonstrate that the presence of workers not only triggers the egg-laying specialization of queens but also actively maintains it in established colonies. The discovery of such social control of queen specialization may reshape our understanding of the functioning of insect societies and their division of labor.

Romain Libbrecht was head of the Reproduction, Nutrition, and Behavior in Insect Societies group at the Institute of Organismic and Molecular Evolution (IOME) at Johannes Gutenberg University Mainz from 2016 to 2022. Since 2023, he has been a researcher at the Insect Biology Research Institute at the CNRS of the University of Tours. He is particularly interested in examining how organisms adjust their reproduction, physiology, and behavior in response to environmental conditions.

 

Related links:

 

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A tandem approach for better solar cells



KING ABDULLAH UNIVERSITY OF SCIENCE & TECHNOLOGY (KAUST)
A tandem approach for better solar cells 

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A REVIEW OF THE POTENTIAL OF COMBINING SILICON SOLAR CELLS WITH PEROVSKITE MATERIALS HIGHLIGHTS HOW TO SCALE UP THIS TECHNOLOGY.

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CREDIT: © 2024 KAUST; HENO HWANG.




Perovskite-based solar cells were first proved in 2009 to have excellent light-absorbing properties of methylammonium lead bromide and methylammonium lead iodide, collectively referred to as lead halide perovskites or, more simply, perovskites. While the efficiency of these first perovskite solar cells was modest, it was the start of a new path in photovoltaic research.

Today, it is clear that future solar cells are likely to include these perovskites in combination with traditional silicon. Erkan Aydin, Stefaan De Wolf and a team from KAUST have reviewed how this tandem technology can move out of the laboratory and be scaled up for commercial fabrication.[1]

The excitement over perovskites stems from the fact that they can be created at low temperatures and are easily deposited on most surfaces, including flexible ones, making them lighter, more adaptable and potentially cheaper than silicon solar panels.

“Both perovskite and silicon solar cells have proved to be highly efficient; however, using them both in tandem in a single cell enables better utilization of sunlight by minimizing the losses that are not converted to electrical charge,” says Aydin.

Aydin and his co-authors have charted the developments in tandem solar-cell fabrication that enable increases in size and power-conversion efficiency. But they highlight that other approaches are needed to make them commercially viable.

One challenge, for example, is that the topography of the silicon surface affects the deposition of the perovskite. The best-performing laboratory devices to date have used spin coating of a perovskite-precursor ink combined with an antisolvent treatment. However, this approach is not suited to commercial processing as it is hard to scale up and wastes a lot of material. Aydin and co-authors discuss the pros and cons of alternative approaches, such as slot-die coating and physical vapor deposition.

Another consideration is that moisture and heat and their combination with light accelerates the degradation of perovskite subcells. The authors detail various accelerated aging and real environment tests on perovskite/silicon tandem solar cells and underline the necessity of focused efforts in this direction. These help predict the reliability and lifetime of perovskite/silicon modules in a range of harsh environments.

“I think the biggest challenge is increasing the reliability of the perovskites subcells,” says Aydin. “Research activities we had so far have indicated that we have not yet reached any fundamental limit, so we need more concentrated effort to realize long-term stable devices.”

The proof-of-concept tandem modules have been introduced already. However, given the significant practical challenges, it is still unclear when perovskite/silicon tandems will reach market grade. However, the success in developing efficient commercial solar cells is vital for meeting the increasing demand for energy while reducing environmental impact.

 

REFERENCE

  1. Aydin, E., Allen, T.B., De Bastiani, M., Razzaq, A., Xu, L., Ugur, E., Liu, J. & De Wolf, S. Pathways toward commercial perovskite/silicon tandem photovoltaics. Science 383, 162 (2024).| article

 

Two plant extracts with potential as GLP-1 agonist weight loss pills are identified by AI-based analysis



EUROPEAN ASSOCIATION FOR THE STUDY OF OBESITY





Two plant compounds with potential as GLP-1 agonist weight loss pills have been identified in an AI (artificial intelligence)-based study, the European Congress on Obesity (ECO 2024) (Venice 12-15 May), will hear.

Glucagon-like peptide-1 (GLP-1) receptor agonists such as semaglutide and tirzepatide are highly effective at helping people lose weight.  By mimicking the action of a hormone called GLP-1 and binding to and activating the GLP-1 receptor in cells, they reduce appetite and feelings of hunger, slow the release of food from the stomach and increase feelings of fullness after eating.

There is, however, a need for alternatives, says Elena Murcia, of the Structural Bioinformatics and High-Performance Computing Research Group (BIO-HPC) & Eating Disorders Research Unit, Catholic University of Murcia (UCAM), Murcia, Spain.

She explains: “Although the effectiveness of current GLP-1 agonists has been demonstrated, there are some side-effects associated with their use – gastrointestinal issues such as nausea, vomiting, and mental health changes like anxiety and irritability. Recent data has also confirmed that when patients stop treatment they regain lost weight.(1,2)

“In addition, most GLP-1 agonists are peptides – short chains of amino acids that can be degraded by stomach enzymes – and so they are currently more likely to be injected rather than taken orally.

“Drugs that aren't peptides may have fewer side-effects and be easier to administer, meaning they could be given as pills rather than injections. Other recent research has highlighted two promising non-peptide compounds, TTOAD2 and orforglipron.(3,4)

“These are synthetic and we were interested in finding natural alternatives.”

Ms Murcia and colleagues used high-performance artificial intelligence (AI) techniques to identify non-peptide natural compounds that activate the GLP-1 receptor.

“We focused on plant extracts and other natural compounds because they may have fewer side-effects,” says Ms Murcia. 

Virtual screening was used to sift through more than 10,000 compounds to identify those that bound to the GLP-1 receptor.

Next, further AI-based methods were used to look at how closely these bonds resembled those that occur between the GLP-1 hormone and its receptor. The 100 compounds that bound most similarly were then chosen for additional visual analysis, to determine whether they interacted with key residues – amino acids – on the receptor.

Finally, a Venn diagram (a mathematical graph using overlapping circles) was compiled to identify the compounds with the highest potential as GLP1-R agonists.

This resulted in a shortlist of 65 compounds, two of which, “Compound A” and “Compound B”, bound strongly to the key residues in a similar way to TTOAD2 and orforglipron. 

Compound A and Compound B are derived from very common plants, extracts of which have been associated with beneficial effects on the human metabolism in the past. Further details of the plants and the compounds are being kept confidential until patents are granted.  It is hoped both could be given in pill-form. The two compounds are now undergoing lab tests. 

Ms Murcia says: “We are in the early stages of developing new GLP-1 agonists derived from natural sources. If our AI-based calculations confirmed in vitro and then in clinical trials, we will have other therapeutic options to manage obesity. 

“Computer-based studies such as ours have key advantages, such as reductions in costs and time, rapid analysis of large data sets, flexibility in experimental design and the ability to identify and mitigate any ethical and safety risks before conducting experiments in the laboratory.

“These simulations also allow us to take advantage of AI resources to analyse complex problems and so provide a valuable initial perspective in the search for new drugs.”

Notes to editors:

References
1. Meier, J. J. Efficacy of Semaglutide in a Subcutaneous and an Oral Formulation. Front. Endocrinol. (Lausanne). 2021, 12. https://doi.org/10.3389/fendo.2021.645617

2. Tobaiqy, M., Elkout, H. Psychiatric adverse events associated with semaglutide, liraglutide and tirzepatide: a pharmacovigilance analysis of individual case safety reports submitted to the EudraVigilance database. Int J Clin Pharm (2024). https://doi.org/10.1007/s11096-023-01694-7
3. Zhao, P., Liang, YL., Belousoff, M.J. et al. Activation of the GLP-1 receptor by a non-peptidic agonist. Nature 577, 432-436 (2020). https://doi.org/10.1038/s41586-019-1902-z
4. Kawai T, Sun B, Yoshino H, Feng D, Suzuki Y, Fukazawa M, Nagao S, Wainscott DB, Showalter AD, Droz BA, Kobilka TS, Coghlan MP, Willard FS, Kawabe Y, Kobilka BK, Sloop KW. Structural basis for GLP-1 receptor activation by LY3502970, an orally active nonpeptide agonist. Proc Natl Acad Sci USA. 2020 Nov 24;117(47):29959-29967. https://doi.org/10.1073/pnas.201487911

 

 

 

 

Nutritional rewards and risks revealed for edible seaweed around Hawaii



AMERICAN CHEMICAL SOCIETY
Nutritional rewards and risks revealed for edible seaweed around Hawaii 

IMAGE: 

SOME SEAWEEDS, LIKE THE ONE SHOWN HERE, ARE A SOURCE OF ESSENTIAL NUTRIENTS BUT MAY ALSO EXPOSE CONSUMERS TO UNSAFE LEVELS OF HEAVY METALS.

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CREDIT: ADAPTED FROM ACS FOOD SCIENCE & TECHNOLOGY 2024, DOI: 10.1021/ACSFOODSCITECH.3C00476




From sushi to soups, seaweed is a popular food around the world because it adds delicious flavors and beneficial nutrients to dishes. However, it might also expose consumers to heavy metals that accumulate in the fronds before they’re harvested. Given seaweed’s importance in the Hawaiian islands, a recent ACS Food Science & Technology publication reports a comprehensive analysis of essential nutrients and heavy metals for six species of seaweeds collected around Hawaii.

Seaweeds accumulate elements from the environment they’re grown in. Scientists know that factors such as the species or growing conditions impact the essential minerals, nutrients, and nonessential or toxic heavy metals in a serving of seaweed. However, not much is known about the balance of helpful versus potentially harmful compounds in many of the varieties traditionally eaten in Hawaii. Furthermore, the U.S. has not established safe regulatory limits for toxic substances such as arsenic and lead in whole pieces of edible seaweed, meaning that some products available for sale may not be tested for these compounds. So, Kacie Ho and colleagues decided to analyze key nutrients and metals in seaweed species grown around Hawaii.

The researchers obtained six types of seaweed that were either cultivated or collected in the wild. They measured the beneficial nutrients and toxic elements in each species and used statistics to differentiate between samples. They found that:

  • Four of the six tested seaweeds were excellent sources of at least one essential mineral — with greater than 20% of the recommended daily value per serving of either iron, manganese, or both calcium and magnesium.
  • The amounts of protein, fat, carbohydrates and fiber varied significantly across the tested species, and generally aligned with previous nutritional assessments for three of the seaweeds.
  • Two wild species that are not commonly consumed, S. aquifolium and S. echinocarpum, had the highest levels of arsenic-containing compounds — far exceeding safe consumption limits established by other countries.
  • Two farmed species, H. formosa and G. parvispora, contained elevated lead levels, which are above those recommended for safe eating in Taiwan.

Overall, the researchers found that Hawaiian seaweeds provide many essential minerals and nutrients, but may also expose consumers to unsafe levels of heavy metals, depending on factors such as seaweed type and growing conditions. Previously published studies suggested that boiling or rinsing other seaweed species, which weren’t included in this work, could remove some harmful substances. But these techniques may also strip away beneficial nutrients. So, Ho and colleagues are collaborating with seaweed growers to study the impact of growing location and common cooking practices on levels of heavy metals and nutrients in Hawaiian seaweeds. Their findings could inform future regulations and ensure nutritious and safe seaweed food products.

The authors acknowledge funding from the United States Department of Agriculture’s National Institute of Food and Agriculture, Multistate Project.

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