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Are we geared to handle aflatoxin problem meaningfully?

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By Emeritus Professor
Upali Samarajeewa
(smrjee@gmail.com)

The media is full of information about the dangers of aflatoxins, increasing fear in the minds of public. Exposure to extremely small doses of aflatoxins of the order of micrograms per kilogram for long periods leads to liver cancer in humans and animals. Aflatoxins can also cause deaths within a few days if people are exposed to extremely high doses of it. In the world, there has been only one such recorded incident due to toxicity; 105 people died after consuming aflatoxin contaminated maize, during a famine in a neighbouring country. The toxic dose was around 20 mg per kilogram. That was in 1975.

In addressing a sensitive issue such as toxicity of human foods, the background scientific information needs to be understood in its correct perspectives to discuss and explore benefits of science to mankind. Aflatoxins are present in most foods in minute quantities. Unfortunately, none of the common food processing and preparation methods including heat processing or cooking could remove the aflatoxins significantly. In case of edible oils, aflatoxins could be removed industrially, only by chemical (alkali) refining. The treatment removes 98% aflatoxins in oils, bringing down aflatoxin concentrations in edible oils to levels safe for consumption. Other methods of ‘refining’ cannot remove aflatoxins. There is a patented process in Sri Lanka to remove aflatoxins in coconut oil using solar radiation. It needs to be scaled up for industrial use.

Humans do not live in an ideal world. We survive in a world of toxins, whether it is aflatoxin, other mycotoxins (mould toxins), heavy metals, like cadmium, mercury, lead or arsenic, or histamine in tuna fish, which causes allergic reactions, familiar to some of us. The list is much longer. We have learned to consume manioc containing cyanide by boiling in open pots to remove toxicity. Manioc is the staple diet in some of the African countries, but they live with it. Sri Lankans have learned to use goraka as a means of checking histamine producing bacteria in tuna fish. Panic should be avoided when it comes to understanding and handling the problems associated with foods.

Science has developed mechanisms to understand the amount of toxins that could be metabolized by the human body safely. Based on this information, risk level for each of the toxic entities in foods is worked out. The risk level is finally established at a concentration a few 1000 times less than concentrations experimentally established to be safe to humans. This simply means world possess regulatory systems, and dependable accredited testing systems, to make food consumption safe, avoiding naturally occurring undesirable constituents. It applies to aflatoxins as well. The volume of a food consumed by a human is also considered in deciding acceptable or tolerable levels, expressed based on per kilogram body weight of the consumer. Weight of the human body and the concentrations of deleterious entities that could be consumed without harmful effects are combined in establishing no-risk levels. Human health is primary in the efforts of sound science to make us live longer. That is food safety.

Ever increasing human populations against available lands and other resources to produce foods require new mechanisms to ensure food security. This is where strict application of ‘good practices’ in agriculture, food processing, and hygiene contributes to the well-being of humans through safe foods. There is the need for striking the best balance between protection of human health and possible application of good practices in food production to enable humans leade healthy lives without becoming a burden to the public health systems.

The food regulations meant to trike this balance continue to change with increasing scientific knowledge of human health as well as fast developing food processing technology. In the developed countries, food regulations are revised frequently to strike the above balance beneficially for humans. The same cannot be said of most developing countries. Sri Lanka is no exception. However, there are ample opportunities for countries, without adequate resources, to develop their own regulations adopting scientifically designed international “Codex” food standards, without reinventing the wheel.

“Codex” stands are developed by the Codex Alimentarius Commission, which is a joint committee of the FAO and WHO.

The international system gives the opportunity for every country to improve its knowledge, taking into consideration the developments in the scientifically advanced countries, and practices of food handling. Codex knowledge helps all countries to develop food standards in line with world trade, which is also an important aspect in our export trade. Sri Lanka needs to be more tuned to get these benefits.

Taking the current global thinking and Sri Lanka’s needs into consideration, the table for aflatoxin regulatory limits was computed with the field experience of the author on food safety issues in more than 25 countries. It was made available to the health authorities in Sri Lanka a few months ago and Institutions interested in standards a week ago. It addresses the levels of acceptance or tolerance (ML = meaning maximum limit that could be tolerated in a food) for aflatoxins in common foods and feeds in Sri Lanka. The proposal also considered the test results generated in local accredited laboratories.

It focuses on the direction to be followed by Sri Lanka to address aflatoxicity problem. The responsible administrators and policy makers may use it. The scientific reasoning to keep the balance between health and food processing is summarised as notes in the table against each recommendation.

This information would be useful to the public, and those who are interested in understanding regulations in relation to presence of aflatoxins in foods in Sri Lanka. The proposed regulations would not contradict any of the globally used regulations in food trade.

Establishing standards is one thing. Applying it through testing only is the proof of the pudding. The interpretation of the generated test results is even more vital. The writer has tested more than 1,000 samples of foods including large number of coconut oil samples for aflatoxins in Sri Lanka and the US, working at the bench, and interpreting results for internationally recognised publications. The aflatoxins tend to adhere to laboratory glassware, and give a positive reaction for the next sample tested unless special cleaning techniques are used. This adherence can happen with any storage surface including container and bowser surfaces. The surfaces of bulk storage systems are never cleaned to get rid of the aflatoxins. Cleaning to remove storage tanks is practically impossible.

The interpretation of test results should be done with deep knowledge of background information. In interpreting test results for field samples, we need to be mindful that local coconut oil contains small concentrations (of the order of 5 -15 parts per billion) of aflatoxins and the imported oil (100 – 300 parts per billion, if what we hear in the press is correct). Skills of the scientist must go far beyond analyst, and the digits generated by instruments through the testing step. Interpretation of results is not a job for the layman. The testing requires demonstrated competency of analysts through continuous practice. Therefore, we need to resort to a laboratory accredited for the purpose. Gazetting a laboratory as public analyst or use of laboratories which holds accreditation for other tests, but not for aflatoxins, particularly oils, are not the best scientific approaches. Let us be mindful that we are discussing handling of human health through assessing an invisible toxin.

I sincerely believe that the decision makers take the above aspects into consideration in data interpretation responsibly, without leaving it to the newsmakers.



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Features

Ranking public services with AI — A roadmap to reviving institutions like SriLankan Airlines

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Efficacy measures an organisation’s capacity to achieve its mission and intended outcomes under planned or optimal conditions. It differs from efficiency, which focuses on achieving objectives with minimal resources, and effectiveness, which evaluates results in real-world conditions. Today, modern AI tools, using publicly available data, enable objective assessment of the efficacy of Sri Lanka’s government institutions.

Among key public bodies, the Supreme Court of Sri Lanka emerges as the most efficacious, outperforming the Department of Inland Revenue, Sri Lanka Customs, the Election Commission, and Parliament. In the financial and regulatory sector, the Central Bank of Sri Lanka (CBSL) ranks highest, ahead of the Securities and Exchange Commission, the Public Utilities Commission, the Telecommunications Regulatory Commission, the Insurance Regulatory Commission, and the Sri Lanka Standards Institution.

Among state-owned enterprises, the Sri Lanka Ports Authority (SLPA) leads in efficacy, followed by Bank of Ceylon and People’s Bank. Other institutions assessed included the State Pharmaceuticals Corporation, the National Water Supply and Drainage Board, the Ceylon Electricity Board, the Ceylon Petroleum Corporation, and the Sri Lanka Transport Board. At the lower end of the spectrum were Lanka Sathosa and Sri Lankan Airlines, highlighting a critical challenge for the national economy.

Sri Lankan Airlines, consistently ranked at the bottom, has long been a financial drain. Despite successive governments’ reform attempts, sustainable solutions remain elusive.

Globally, the most profitable airlines operate as highly integrated, technology-enabled ecosystems rather than as fragmented departments. Operations, finance, fleet management, route planning, engineering, marketing, and customer service are closely coordinated, sharing real-time data to maximise efficiency, safety, and profitability.

The challenge for Sri Lankan Airlines is structural. Its operations are fragmented, overly hierarchical, and poorly aligned. Simply replacing the CEO or senior leadership will not address these deep-seated weaknesses. What the airline needs is a cohesive, integrated organisational ecosystem that leverages technology for cross-functional planning and real-time decision-making.

The government must urgently consider restructuring Sri Lankan Airlines to encourage:

=Joint planning across operational divisions

=Data-driven, evidence-based decision-making

=Continuous cross-functional consultation

=Collaborative strategic decisions on route rationalisation, fleet renewal, partnerships, and cost management, rather than exclusive top-down mandates

Sustainable reform requires systemic change. Without modernised organisational structures, stronger accountability, and aligned incentives across divisions, financial recovery will remain out of reach. An integrated, performance-oriented model offers the most realistic path to operational efficiency and long-term viability.

Reforming loss-making institutions like Sri Lankan Airlines is not merely a matter of leadership change — it is a structural overhaul essential to ensuring these entities contribute productively to the national economy rather than remain perpetual burdens.

By Chula Goonasekera – Citizen Analyst

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Features

Why Pi Day?

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International Day of Mathematics falls tomorrow

The approximate value of Pi (π) is 3.14 in mathematics. Therefore, the day 14 March is celebrated as the Pi Day. In 2019, UNESCO proclaimed 14 March as the International Day of Mathematics.

Ancient Babylonians and Egyptians figured out that the circumference of a circle is slightly more than three times its diameter. But they could not come up with an exact value for this ratio although they knew that it is a constant. This constant was later named as π which is a letter in the Greek alphabet.

Archimedes

It was the Greek mathematician Archimedes (250 BC) who was able to find an upper bound and a lower bound for this constant. He drew a circle of diameter one unit and drew hexagons inside and outside the circle such that the sides of each hexagon touch the sides of the circle. In mathematics the circle passing through all vertices of a polygon is called a ‘circumcircle’ and the largest circle that fits inside a polygon tangent to all its sides is called an ‘incircle’. The total length of the smaller hexagon then becomes the lower bound of π and the length of the hexagon outside the circle is the upper bound. He realised that by increasing the number of sides of the polygon can make the bounds get closer to the value of Pi and increased the number of sides to 12,24,48 and 60. He argued that by increasing the number of sides will ultimately result in obtaining the original circle, thereby laying the foundation for the theory of limits. He ended up with the lower bound as 22/7 and the upper bound 223/71. He could not continue his research as his hometown Syracuse was invaded by Romans and was killed by one of the soldiers. His last words were ‘do not disturb my circles’, perhaps a reference to his continuing efforts to find the value of π to a greater accuracy.

Archimedes can be considered as the father of geometry. His contributions revolutionised geometry and his methods anticipated integral calculus. He invented the pulley and the hydraulic screw for drawing water from a well. He also discovered the law of hydrostatics. He formulated the law of levers which states that a smaller weight placed farther from a pivot can balance a much heavier weight closer to it. He famously said “Give me a lever long enough and a place to stand and I will move the earth”.

Mathematicians have found many expressions for π as a sum of infinite series that converge to its value. One such famous series is the Leibniz Series found in 1674 by the German mathematician Gottfried Leibniz, which is given below.

π = 4 ( 1 – 1/3 + 1/5 – 1/7 + 1/9 – ………….)

The Indian mathematical genius Ramanujan came up with a magnificent formula in 1910. The short form of the formula is as follows.

π = 9801/(1103 √8)

For practical applications an approximation is sufficient. Even NASA uses only the approximation 3.141592653589793 for its interplanetary navigation calculations.

It is not just an interesting and curious number. It is used for calculations in navigation, encryption, space exploration, video game development and even in medicine. As π is fundamental to spherical geometry, it is at the heart of positioning systems in GPS navigations. It also contributes significantly to cybersecurity. As it is an irrational number it is an excellent foundation for generating randomness required in encryption and securing communications. In the medical field, it helps to calculate blood flow rates and pressure differentials. In diagnostic tools such as CT scans and MRI, pi is an important component in mathematical algorithms and signal processing techniques.

This elegant, never-ending number demonstrates how mathematics transforms into practical applications that shape our world. The possibilities of what it can do are infinite as the number itself. It has become a symbol of beauty and complexity in mathematics. “It matters little who first arrives at an idea, rather what is significant is how far that idea can go.” said Sophie Germain.

Mathematics fans are intrigued by this irrational number and attempt to calculate it as far as they can. In March 2022, Emma Haruka Iwao of Japan calculated it to 100 trillion decimal places in Google Cloud. It had taken 157 days. The Guinness World Record for reciting the number from memory is held by Rajveer Meena of India for 70000 decimal places over 10 hours.

Happy Pi Day!

The author is a senior examiner of the International Baccalaureate in the UK and an educational consultant at the Overseas School of Colombo.

by R N A de Silva

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Features

Sheer rise of Realpolitik making the world see the brink

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A combined US-Israel attack on Iran.(BBC)

The recent humanly costly torpedoing of an Iranian naval vessel in Sri Lanka’s Exclusive Economic Zone by a US submarine has raised a number of issues of great importance to international political discourse and law that call for elucidation. It is best that enlightened commentary is brought to bear in such discussions because at present misleading and uninformed speculation on questions arising from the incident are being aired by particularly jingoistic politicians of Sri Lanka’s South which could prove deleterious.

As matters stand, there seems to be no credible evidence that the Indian state was aware of the impending torpedoing of the Iranian vessel but these acerbic-tongued politicians of Sri Lanka’s South would have the local public believe that the tragedy was triggered with India’s connivance. Likewise, India is accused of ‘embroiling’ Sri Lanka in the incident on account of seemingly having prior knowledge of it and not warning Sri Lanka about the impending disaster.

It is plain that a process is once again afoot to raise anti-India hysteria in Sri Lanka. An obligation is cast on the Sri Lankan government to ensure that incendiary speculation of the above kind is defeated and India-Sri Lanka relations are prevented from being in any way harmed. Proactive measures are needed by the Sri Lankan government and well meaning quarters to ensure that public discourse in such matters have a factual and rational basis. ‘Knowledge gaps’ could prove hazardous.

Meanwhile, there could be no doubt that Sri Lanka’s sovereignty was violated by the US because the sinking of the Iranian vessel took place in Sri Lanka’s Exclusive Economic Zone. While there is no international decrying of the incident, and this is to be regretted, Sri Lanka’s helplessness and small player status would enable the US to ‘get away with it’.

Could anything be done by the international community to hold the US to account over the act of lawlessness in question? None is the answer at present. This is because in the current ‘Global Disorder’ major powers could commit the gravest international irregularities with impunity. As the threadbare cliché declares, ‘Might is Right’….. or so it seems.

Unfortunately, the UN could only merely verbally denounce any violations of International Law by the world’s foremost powers. It cannot use countervailing force against violators of the law, for example, on account of the divided nature of the UN Security Council, whose permanent members have shown incapability of seeing eye-to-eye on grave matters relating to International Law and order over the decades.

The foregoing considerations could force the conclusion on uncritical sections that Political Realism or Realpolitik has won out in the end. A basic premise of the school of thought known as Political Realism is that power or force wielded by states and international actors determine the shape, direction and substance of international relations. This school stands in marked contrast to political idealists who essentially proclaim that moral norms and values determine the nature of local and international politics.

While, British political scientist Thomas Hobbes, for instance, was a proponent of Political Realism, political idealism has its roots in the teachings of Socrates, Plato and latterly Friedrich Hegel of Germany, to name just few such notables.

On the face of it, therefore, there is no getting way from the conclusion that coercive force is the deciding factor in international politics. If this were not so, US President Donald Trump in collaboration with Israeli Rightist Premier Benjamin Natanyahu could not have wielded the ‘big stick’, so to speak, on Iran, killed its Supreme Head of State, terrorized the Iranian public and gone ‘scot-free’. That is, currently, the US’ impunity seems to be limitless.

Moreover, the evidence is that the Western bloc is reuniting in the face of Iran’s threats to stymie the flow of oil from West Asia to the rest of the world. The recent G7 summit witnessed a coming together of the foremost powers of the global North to ensure that the West does not suffer grave negative consequences from any future blocking of western oil supplies.

Meanwhile, Israel is having a ‘free run’ of the Middle East, so to speak, picking out perceived adversarial powers, such as Lebanon, and militarily neutralizing them; once again with impunity. On the other hand, Iran has been bringing under assault, with no questions asked, Gulf states that are seen as allying with the US and Israel. West Asia is facing a compounded crisis and International Law seems to be helplessly silent.

Wittingly or unwittingly, matters at the heart of International Law and peace are being obfuscated by some pro-Trump administration commentators meanwhile. For example, retired US Navy Captain Brent Sadler has cited Article 51 of the UN Charter, which provides for the right to self or collective self-defence of UN member states in the face of armed attacks, as justifying the US sinking of the Iranian vessel (See page 2 of The Island of March 10, 2026). But the Article makes it clear that such measures could be resorted to by UN members only ‘ if an armed attack occurs’ against them and under no other circumstances. But no such thing happened in the incident in question and the US acted under a sheer threat perception.

Clearly, the US has violated the Article through its action and has once again demonstrated its tendency to arbitrarily use military might. The general drift of Sadler’s thinking is that in the face of pressing national priorities, obligations of a state under International Law could be side-stepped. This is a sure recipe for international anarchy because in such a policy environment states could pursue their national interests, irrespective of their merits, disregarding in the process their obligations towards the international community.

Moreover, Article 51 repeatedly reiterates the authority of the UN Security Council and the obligation of those states that act in self-defence to report to the Council and be guided by it. Sadler, therefore, could be said to have cited the Article very selectively, whereas, right along member states’ commitments to the UNSC are stressed.

However, it is beyond doubt that international anarchy has strengthened its grip over the world. While the US set destabilizing precedents after the crumbling of the Cold War that paved the way for the current anarchic situation, Russia further aggravated these degenerative trends through its invasion of Ukraine. Stepping back from anarchy has thus emerged as the prime challenge for the world community.

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