How Glowing Bacteria Could Detect Water Pollution

 By: Roberto Reyna

Figure 1. Luminescence levels (% residual glow) of immobilized glowing bacteria (BB′) over time after being exposed to deionized water or different strengths of hydrochloric acid (HCl): (a) 50 mM, (b) 5 mM, (c) 0.5 mM, and (d) 50 µM. The unshaded bars show luminescence during exposure; the shaded bars show how much light returned after placing the bacteria back into nutrient-rich Boss media. Measurements were taken at 0, 10, 20, and 30 minutes and averaged from three tests (mean ± standard deviation).

What if glowing bacteria could help us detect pollution in our drinking water? That’s the main idea behind the scientific method that uses bioluminescent marine bacteria to detect toxic substances like mercury. These bacteria naturally emit light and when it's exposed to harmful chemicals they “go dark”, a signal of potential danger.

But researchers recently discovered an interesting result. Sometimes, these bacteria stop glowing not because they’re poisoned, but because of temporary stress. For instance, being placed in pure water or mildly acidic conditions. In this study, scientists found that when returned to their ideal environment, the bacteria’s glow came back. This “luminescence reversal effect” demonstrates that not all loss of light means toxicity.

Something very interesting is that small amounts of mercury or acid sometimes made the bacteria glow brighter, a phenomenon called hormesis, where low level stress stimulates biological activity.

Why is it important ? Because without accounting for these temporary effects, we risk false positives, incorrectly indicating safe water as toxic. This new approach offers a more accurate, low-cost and portable way to test environmental safety, especially in rural or developing areas where advanced labs aren’t accessible.

Furthermore by refining this method and exploring how these bacteria react at the genetic level, in the future these “microbial flashlights” could play a significant role in global water safety, food testing, and pollution monitoring.

Citation (Article & Image):

Ranjan R, Goswami S, Sharma N, Vashishtha LM, Singh M, Verma Y, Rana SVS, Kratasyuk V, Kumar S, Pandey A. 2025. Acute Osmotic and pH Shock to Bioluminescent Bacteria Is Reversible in Terms of Luminescence Response. Luminescence : the journal of biological and chemical luminescence. 40(1):e70082. doi:10.1002/bio.70082. http://dx.doi.org/10.1002/bio.70082.

Resolution to Sludgy Situations with the Cooperation of Plants and Microorganisms

 Resolution to Sludgy Situations with the Cooperation of Plants and Microorganisms

By Jose Chavana

Image shows the presence of microorganisms in the root system of Scirpus grossus, where they receive nutrients from the roots and break down crude oil sludge components, which are then absorbed by the roots and conveyed to the shoot system. Figure taken from Sharuddin et al. 2024.

    Though plants are essential contributors to Earth due to their natural provisions such as photosynthesis and passing on obtained solar energy towards the top of the food chain, their association with rhizosphere procedures to remediate soil areas from petroleum oily sludge, a residue released by polluted crude oil, is underexamined. Sharuddin and colleagues investigated the presence of Scirpus grossus on soil contaminated with crude oil sludge to record any changes to the concentration of S. grossus within the soil. The experiment demonstrated that the presence of S. grossus in sludge-contaminated soil experienced, though a course of 28 days, a greater removal of sludge oil than in soil with no S. grossus present. The root system of S. grossus transfers sludge components (heavy metals, organic compounds, and other pollutants) throughout different areas within S. grossus via its vascular tissues, which cause harm to the growth of the plant but don't entirely kill it. In addition, extracts and nutrients from the roots can supply substrates that support the survival and reproduction of microbial populations in the soil, which in turn can degrade contaminants, including crude oil sludge. This research could be environmentally sustainable as it provides the utilization of  S. grossus to reduce the presence of harmful contaminants in areas already heavily affected by the mismanagement of crude oil, which might be a much simpler and cheaper alternative to saving the environment from further harm. 

Sharuddin SSN, Abdullah SRS, Hasan AH, Othman AR, Ismail NI. 2004. Rhizobacterial-assisted phytoremediation for accelerated petroleum-hydrocarbon removal in crude-oil sludge. Sci Total Environ. 954:176189-176202. 

Plant Power against Power Plants! : Mitigating Carbon Dioxide Emissions through Carbon Capture

 By: Reynaldo Gonzalez

Image depicts a vertical plant factory, a facility which is designed with the purpose of creating an area that performs carbon sequestration. (Source Vertical Farming by BIOPOLUS https://www.biopolus.net/technology/vertical-farming/)

 

        Carbon capture through vertical plant factories is a method of mitigating the levels of carbon dioxide emissions of industries (Chen, et al. 2024). In this study, there is an assessment of the carbon sequestration capabilities of the Pennisetum giganteum, specifically by placing this plant factory in an industrial park, an area with heavy CO2 exhaust levels, and performing a "Life Cycle Assessment".

        The findings showed that the plant factory's own carbon emissions were mainly from the heavy consumption of electricity for the constant lighting for plant growth. In order to accommodate for maximum efficiency, renewable energy and reclaimed water were used so as to have the most sustainable method of production. In addition, P. giganteum is the organism of choice for this task since it has a rapid growth rate, easily met requirements for cultivation, and has great carbon sequestration capacity (Chen, et al. 2024). In the end, the results showed that a plant factory of dimensions 3 m x 6 m x 2.8 m can be used to cultivate 2160 kg of P. giganteum annually and have a reduction carbon emissions by 56% compared to that of an open-field cultivation and the expansion of these plants can essentially neutralize carbon emissions of industrial parks completely (Chen, et al. 2024).

        This article showcases advancements in environmental sustainability by allowing for the reduction in impact of large industries to the atmosphere. However, as mentioned earlier, this practice is very demanding in terms of electricity and water, and can be contributing to more damage than helping at all, if done incorrectly. Overall though, this study highlights the potential of a bio-based carbon capture facility that can aid in the mitigation of carbon dioxide emissions of large industrial companies.

 

Chen H,  Dong X,  Lei J, Zhang N, Wang Q, Shi Z, Yang J. 2024. Life Cycle Assessment of Carbon Capture by an Intelligent Vertical Plant Factory within an Industrial Park. Sustainability. 16(2):697

Smoking Sugar is Harmful!!!

 By: Jorge Sanchez

A worker is monitoring the burning of a sugar cane field located in San Benito, Texas. (Source: MYSA https://www.mysanantonio.com/opinion/commentary/article/Burning-of-sugar-cane-fields-linked-to-health-13709918.php)

We all love to discover sugar within our fruits, vegetables, and food products to supply ourselves with energy, and ensure that beautiful sweet taste on our palate. The United States relies on Florida to produce a majority of its sugar for the country, and it has dedicated regions filled with sugarcane fields that extend to dozens of acres. Though, the process of harvesting this sugarcane may prove harmful to the residents that live nearby these regions. The harvesting process starts with prescribed fires that burns away leaves and flowers that fertilize the soil, which makes it easier for sugar refinement and replanting the fields later in time. Unfortunately, the issue lies with the burning fields causing high amounts of particle pollution like smoke and ashes, which spreads into the surrounding cities. The residents in these cities breathe in these particles, which is linked to lung and other cancers, cardiopulmonary disease such as ischemic heart disease, and premature death (Nowell et al., 2022). A simple solution would be to stop burning the sugar cane fields, except we would have to discover a different method to pick out the leaves and flowers, and find a new solution to fertilize the soil. Burning the sugar cane fields saves time, reduces the amount of labor needed for sugar refinement, and prepares the soil for future replanting. The current harvesting method helps with selling the sugar in a timely manner. Thus, an alternative method might not be cost effective as burning the sugarcane, and doesn't deny the possibility of causing other issues that may also be harmful for humans and the environment. 

Original Article: 

Nowell H, Wirks C, Martin M, Donkelaar R, Martin R, Uejio C, Holmes C. 2022. “Impacts of sugarcane fires on air quality and Public Health in south Florida.” Environmental Health Perspectives. 130(8).  https://doi.org/10.1289/ehp9957.

The Lignin Link: Connecting Sustainability and Technology

The Lignin Link: Connecting Sustainability and Technology

By: Israel Adame

 

A cartoon photo depicting the journey of lignin polymers. From plants to factories to lignin, with the cartoon depiction of a lignin polymer taking up the majority of the bottom of the photo. (Source: Lignin Biopolymers in the Age of Controlled Polymerization published by https://www.mdpi.com/2073-4360/11/7/1176).

What I found interesting about the topic, in general, is that a polymer found in the cell walls of plants has the potential to replace fossil-based materials, and, unlike these materials, lignins come from a renewable resource. According to the findings in this article, the use of lignins as the better material over the standard in manufacturing epoxy resins can go both ways, depending on what you are looking at. When it comes to global warming, fossil resource scarcity, and water consumption, lignin-based polymers have a lower environmental impact. However, they have a high impact on human toxicity (carcinogenic and non-carcinogenic) and freshwater eutrophication (excessive richness of nutrients). The endpoint methodology used by the researcher showed lignin-based polymers as the more sustainable choice in the categories of natural resource use and natural ecosystems, but in human health, no clear preference between lignins and the standard was evident. The trade-offs to having a more sustainable base material for epoxy resin would be its effects on human health and the freshwater eutrophication that it causes. Overall, lignins could be a sustainable option as a base for epoxy resins, but further research and technological advancements are needed to reduce the trade-offs to human health.

Juhl M, Hauschild MZ, Dam-Johansen K. 2024. Assessing the Environmental Sustainability of Lignin-Based Epoxy Resins for Coating Production. ACS Publications 12(12); [Accessed 2024 Oct 14]. https://pubs.acs.org/doi/10.1021/acssuschemeng.3c08022

 

Natural Capital and its Role In Urban Development

 By Joel Martinez

Image of the schematic overview provided by the researchers showing key variables within their modelling framework

Figure taken from O'Keeffe Et al. 2022

                Natural capital has been recognized to play an extremely important role in sustainable development and provides valuable ecosystem services, which include the reduction of air pollution, reducing flooding, and aids in urban production. Production of natural capital and ecosystem sercices is noted in urban areas that may provide plenty of benefits, but poorly planned urbanization creates a significant challenge to the provision of ecosystem services. Green Infrastructure and Nature Based Solutions are aiming to use natural capital as a means of green growth, as well as sustaibable development. Athough largely recognized as a positive element, urban natural capital is difficult to actually measure and makes it difficult for a justfication of urban (re)development to be provided.

                The Thamesmead Waterfront Development in London was used as the area of study, and a system dynamics model was used to help grade and assess the performance of natural capital in the development using different scenarios. Researchers partaking in the study used the Natural Space Performance to evaluate the capacity of this space to be able to provide ESS using natural capital. The capacity of the model was also used to show the ways in which development affects natural capital and ESS. 

                Researchers found that using the SD model was useful in concpetualising natural capital and its usage in development projects. The evaluation of natural capital and their inclusion in future projects can enhnace blue and green space in cities and enhance the quality of life for citizens and improve overall urban sustainability.

Original Article:

O'Keeffe J, Pluchinotta I, De Sterke S, Hinson C, Puchol-Salort P, Mijic A, Zimmermann N, Collins A M. 2024. Evaluating natural capital performance of urban development through system dynamics: A case study from London. Science of The Total Environment 824: 153673 - 153684. https://doi.org/10.1016/j.scitotenv.2022.153673

Reviving Harsh Soils: Soil remediation using phosphate-solubilizing bacteria

 By Fernanda Castillo

    Saline and alkaline stress on soil creates problems such as loss of vegetation, decreased nitrification rates, loss of available phosphorous, and of course, high pH (Guo et al. 2021). As a result, these environments are low in available nutrients and face degradation. A 2024 study focuses on phosphorus-solubilizing bacteria (PSB), and how they interact with soil microbial composition, nutrient cycling, and plant resilience in coastal wetlands (Sun et al.). In saline and alkaline soils, beneficial PSB such as Bacillus and Exiguobacterium have shown to significantly boost plant growth. These bacteria lower soil pH, ensuring nutrients like phosphorous, nitrogen, and potassium are more available for plants (Sun et al. 2024).

    Phosphorous is already present in the soil. However, high pH causes the phosphorous to bind to calcium that is present in alkaline soil. This creates a form of phosphorous that plants are unable to use for chemical reactions such as photosynthesis. Now, here is where the bacteria get to work. The bacteria that were studied help release the phosphorous by secreting organic acids, which lower the soil's pH and bind to the calcium-phosphate molecules. This makes the phosphate soluble, which then makes it easier for plants to use it (Sun et al. 2024). 

A diagram of phosphate-solubilization mechanisms (Iftikhar et al. 2023).

    The study tested these PSB strains on soils both treated with saline and alkaline solutions, and on non-stressed conditions, which were treated with sterile water. The soils were then used to plant Suaeda salsa (L.) Pall, an annual herb resistant to salinity and drought that is commonly found in coastal wetlands (Li et al. 2021). These tests found that the PSB strains improved plant growth only on the plants growing in the stressed conditions; the plants growing in non-stressed conditions that were inoculated with PSB decreased in biomass. Under saline and alkaline stress, the bacteria were able to reduce the soil pH and in turn, enhance the availability of phosphorus, nitrate, and potassium. In the absence of these stressed conditions, the bacteria were very weak at solubilizing phosphate. Interestingly, the study also found that the soil microbial communities were altered in the stressed soils inoculated with PSB, due to the change in pH and salinity after the phosphate-solubilization. The decreases in pH and salinity caused certain microorganisms to be affected because of their sensitivities to certain conditions (Sun et al. 2024).

    This research mainly diverts attention to S. suaeda restoration in East Asia and Australasia, but the findings can easily be applied to any areas of the world struggling with high salinity and alkaline soil. Soil health is an extremely important topic that most people should be educated on, especially those in agriculture. Biological solutions in soil management helps promote sustainable land use and soil remediation instead of land degradation (Sun et al. 2024).

Guo J, Zhou Y, Guo H, Min W. 2021. Saline and alkaline stresses alter soil properties and composition and structure of gene-based nitrifier and denitrifier communities in a calcareous desert soil. BMC Microbiology. 21:246. https://doi.org/10.1186/s12866-021-02313-z.

Iftikhar A, Farooq R, Akhtar M, Khalid H, Hussain N, Ali Q, Saif ul Malook, Ali D. 2024. Ecological and sustainable implications of phosphorous-solubilizing microorganisms in soil. Discov Appl Sci. 6(2). https://doi.org/10.1007/s42452-024-05683-x.

Song Y, Liu J, Wang J, Liu F. 2021. Growth, Stoichiometry, and Palatability of Suaeda salsa From Different Habitats Are Demonstrated by Differentially Expressed Proteins and Their Enriched Pathways. Front Plant Sci. 12. https://doi.org/10.3389/fpls.2021.733882

Sun X, Wang W, Yi S, Zheng F, Zhang Z, Alharbi SA, Ekaterina Filimonenko, Wang Z, Yakov Kuzyakov. 2024. Microbial composition in saline and alkaline soils regulates plant growth with P-solubilizing bacteria. Appl Soil Ecol. 203:105653–105653. https://doi.org/10.1016/j.apsoil.2024.105653

Sugar Isn't Just Sweet: How Sugar Cane Waste Can Help Create Bioplastics

By Diana Elisa Nuno

Film of bioplastic created through PHA Synthesis (Left) and bottle caps produced by PHA bioplastic (Right) 

(Source: PHA bioplastic made with the help of predatory bacteria, by MaterialDistrict, https://materialdistrict.com/article/pha-bioplastic-predatory-bacteria/,  CJ Biomaterials unveils fully biodegradable PHA bottle cap by Bioplastic Magazine, https://www.bioplasticsmagazine.com/en/news/meldungen/20240403-CJ.php.) 

      Plastic products are widely used in everyday life, from household items like bottled water, food containers, and grocery bags to disposable gloves, sterile packaging, and syringes seen in hospitals. However, plastics such as polypropylene and polyethylene are created from nonrenewable resources such as fossil fuels, which take years to degrade and negatively impact the environment through microplastics and pollution. Because of this, it is important to find biodegradable alternatives to plastic products.

  Bioplastics, such as polyhydroxybutyrate, can be synthesized through the process of polyhydroxyalkanoate (PHA) production. This process consists of feeding bacteria a carbon source while limiting other nutrients. These bacteria then create PHA's as a nutrient storage, which can be extracted to create bioplastics. These bioplastics can be used to create alternatives for common plastic products. However, producing a food source for bacteria can be costly, hindering these products from becoming easily accessible.

  To synthesize bioplastics, the researchers of this article collected cane molasses, a by-product of sugar cane waste, creating an inexpensive, environmentally sustainable carbon source for the bacterial species, Alcaligenes sp. NCIM 5085. Since cane molasses is a by-product, it is usually discarded as waste. Utilizing the sugar by-product reduces waste and allows bioplastics to become more available. The article suggests that this research could be used to make bioplastics more easily accessible to consumers. However, this process has several tradeoffs, one example being that the fermentation process can become time-consuming while still being more expensive than plastic.

  Overall, since plastics are detrimental to the environment, it is important to find plastic alternatives to limit pollution. This research advances environmental science by offering an alternative to plastic products and preventing cane molasses from becoming a wasted material.

Original Article:

Kanzariya R , Gautam A , Parikh S, Gautam S. 2022. Kinetics of biomass and polyhydroxyalkanoates synthesis using sugar industry waste as carbon substrate by Alcaligenes sp. NCIM 5085. J. Environ. Biol.[accessed 2024 October 11];  44 (4): 612-622. http://doi.org/10.22438/jeb/44/4/MRN-5096 .

Environmental Justice at Stake: The Slow Erosion of Health in Industrial Areas

 

Fig. 1. Environmental conflicts registered in the EJAtlas (n = 3030). A: Geographical coverage of environmental conflicts (each dot represents one case and each colour a category of conflict). B: Category of conflicts and coverage (pie colours correspond to the colour of the cases shown in the map). C: Percentage of EHC cases and non-EHC cases. This figure follows a similar representation as in Scheidel et al., 2020.

The concept of slow violence refers to the slow harm caused by pollution to low-income communities. The article introduces how toxic pollutions affect these communities gradually over time, making it a hidden form of harm. The researchers dove into a comprehensive global database that compromises over 3,033 environmental conflicts. It focuses on the differences between environmental conflicts with health impacts (EHCs) and those that do not (non-EHCs), offering a better understanding of the complex relationships between environmental degradation, human health, and social justice. The research highlights how the toxic pollution affects the communities through slow, long-term exposure. It was revealed that the exposure has led to human health deterioration like respiratory problems and cancer, a topic often overlooked. Unique to this research is its global perspective, showing the similarities across regions and industrial sectors. The article urges policymakers to prioritize environmental justice and regulate industrial pollution to create a safer environment to public health. Developing more effective strategies to dictate the adverse affects of the environment on human health is an essential policy. The study emphasizes the need for the community involvement to address the challenges posed by EHC. A trade-off is implementing stricter pollution controls that can potentially raise operational costs for industries. Addressing the slow violence from toxic pollutions is necessary for achieving environmental sustainability, ensuring the protection of communities. Ultimately, this research highlights the importance of considering the relationships between environmental conflicts in order to pursuit environmental sustainability.

Navas G, D’Alisa G, Martínez-Alier J. 2022. The role of working-class communities and the slow violence of toxic pollution in environmental health conflicts: A global perspective. Global Environmental Change. 73:102474. doi:https://doi.org/10.1016/j.gloenvcha.2022.102474.

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Rising Through the Struggle: The Struggle and Persistance of Plants Through Climate Stress

By: Yesnia Solis

Figure 1. Roots of a tree growing through the cracks of dry soil. Freepik. The Impact of Climate Change Tree Roots Breaking Through Dry Cracked Ground Concept Climate Change Environmental Impact Drought Effects Tree Roots Soil Breakage. [accessed 2024 Oct 14]. https://www.freepik.com/premium-ai-image/impact-climate-change-tree-roots-breaking-through-dry-cracked-ground-concept-climate-change-environmental-impact-drought-effects-tree-roots-soil-breakage_252545689.htm

As concerns about the impacts of global warming grow each year, scientists and agricultures worry about how this problem may impact plants and the natural capital. Researchers have been studying how we can restore the natural capital of agriculture, but the earth may be capable of doing it itself. A study was conducted on the perennial pasture grass Festuca arundinacea throughout the four seasons, with the grass being in subplots that were subjected to simulated drought by less irrigation and a warming climate by adjusting the temperature of the site of study. Researchers observed the root plasticity of the grass and how it adapted to the changes. When the grass underwent “drought,” its roots would grow deeper to reach water but have a reduced diameter, maintaining the grass through the seasons. However, it had lower productivity in colder seasons. A warmer climate combined with drought also reduced the diameter of the roots and the nitrogen concentrations, causing lower production and reduced biomass. This shows that, while plants adapt to survive against environmental struggles, their productivity is not assured to be on the same level as the demand we have for them. Our resource demand and climate change are severely affecting our natural capital, and even if plants can adapt, we need to consider our future, knowing the effects we are causing. 

Original article:

Chandregowda MH, Tjoelker MG, Pendall E, Zhang H, Churchill AC, Power SA. 2023. Belowground carbon allocation, root trait plasticity, and productivity during drought and warming in a pasture grass. Jrnl of Exp Botany. 74(6):2127-2145. https://doi.org/10.1093/jxb/erad021 

Wood-Powered Tech? The future of sustainable and flexible electronics

This image is showing the process of making a wood substrate and demonstrating the flexibility of a wood-based electronic

                                        https://ars.els-cdn.com/content/image/1-s2.0-S0045653523014807-ga1_lrg.jpg

The industry behind making modern electronics is very unsustainable due to the mining of rare earth metals and fabricating these electronics uses a lot of energy. As global e-waste grows 10% annually and has about a 10% recovery rate. However, there have been new advancements in techniques on how to use bipolymers such as cellulose which is found in wood to be used in flexible electronics. A flexible electronic system is made of three parts: substrate, backplane, and frontplane in order for the electronic to be flexible it must be lightweight, resilient, and moldable and in order for the electronic to work all of its parts must be flexible. Cellulose by itself is a very strong polymer as it is what gives wood its shape, by isolating the cellulose from lignin it can create a transparent wood film. This is where wood product cellulose comes in, it has been shown to be a great substrate as they have properties similar to nonbiodegradable substrates such as plastics but also has better characteristics such as its ability to be recycled and flexibility. However, the only drawback is that cellulose cannot conduct electricity well, but with conductive materials added to it can. Continuing research into this new method of making electronics, it can help elevate the environmental toll on the earth by making electronics sustainable and relying less on non-biodegradable toxic products.

Malik H et al. Wood as a green and sustainable alternative for environmentally friendly & flexible electronic devices. Chemosphere. 2023;336(139213):139213. https://linkinghub.elsevier.com/retrieve/pii/S0045653523014807. https://doi.org/10.1016/j.chemosphere.2023.139213

 

Chemicals vs. Nature: The Battle for Clean Water (Spoiler: The Nature Won)

This image represents how our own pollution returns in the form of contaminated water and enters our bodies. The glass of water, which is supposed to be purified, is not free of contaminants, and this will affect the individual’s health in the future. HOW TO AVOID UNSAFE DRINKING WATER. (n.d.). https://images.app.goo.gl/P3mvJfq6cfVYqSsy5

Water is a fundamental element for life and for the execution of human activities such as agriculture and industrialization. Currently the world is facing a shortage of fresh water produced by the exponential growth of the population and the increase in pollution. This affects health since contaminated water can spread diseases such as cholera and diarrhea (Koul et al. 2022) Water treatment is necessary to prevent this diseases and to reduce environmental pollution. During this purification process, coagulants are used to allow unwanted particles to agglomerate and be removed by filtration. This article exposes how the use of chemical coagulants in water treatments negatively impacts the ecosystem. Chemical coagulants are toxic and pose a high risk to public health and the environment. When in contact with water they can leave heavy metal waste and alter the ph of the treated water (Koul et al. 2022) Therefore, the use of natural coagulants is suggested to replace chemical coagulants. Natural coagulants are made from plants, animals or microbial origin, for this reason they do not pollute and do not generate hazardous waste. They are also a more economical and sustainable alternative for practices such as water purification (Koul et al. 2022) Several studies were conducted to compare the efficiency and benefits of natural coagulants over chemical coagulants. The ability to agglomerate unwanted particles and reduce turbidity in water samples was analyzed. The results indicated that natural coagulants are as effective as chemical coagulants. However, chemical coagulants are generally more efficient for treating larger quantities of contaminants due to their higher coagulation rates. Despite this, they pose significant risks to aquatic ecosystems because of their toxicity and potential to generate harmful waste. In contrast, natural coagulants have biodegradable properties and natural compounds, which do not adversely affect aquatic environments (Koul et al. 2022). This finding emphasizes the importance of prioritizing sustainable practices in water treatment. It is essential to balance efficiency with environmental safety and affordability.

Bhupendra K, Nargis B, Mustapha A, Meerambika M, Ananta P, Dhananjay Y.  2023. Application of Natural Coagulants in Water Treatment: A Sustainable Alternative to Chemicals. Water 14(22):[28 p.].

Maximizing Freshness: Prolonging Produce Shelf-Life with UV-C Irradiation and Vacuum Sealing

 By: Karen Hernandez 

Figure 9. The average increase in the shelf life of all experimental samples. The standard deviation of the three shelf-life measurement runs under the four storage conditions has been calculated and used to derive error bars. Figure taken from Damdam. et al. 2023. The image shows the change in shelf-life as the applied method changes. 

    It’s happened to everyone: you buy fresh produce, forget about it, it goes bad, and we end up throwing it away. Not only is our money wasted, but so is food, which is a great contributor to environmental pollution. Bacteria greatly contribute to fruit spoilage; in this study, scientists found a way to reduce food waste by combining two technologies: vacuum sealing and UV-C irradiation.  
    While vacuum sealing slows spoilage by removing air, UV-C irradiation uses ultraviolet light to kill bacteria, viruses, fungi, and mold (responsible for spoilage) by damaging their DNA or RNA without any chemicals. When used together, the results are impressive. The study used strawberries and tomatoes as model organisms to study the spoilage rates based on the type of method used. They used vacuum sealing alone, UV-C irradiation alone, UV-C irradiation, and vacuum sealing, along with a control. The strawberries and tomatoes treated with both UV-C irradiation and vacuum sealing lasted 124.41% and 54.41% longer than usual, respectively. 
This technology aims to keep food fresher for longer and reduce waste, benefiting both consumers and retailers. Since agriculture significantly contributes to environmental pollution, reducing food waste could lower pollution levels, save money, and improve economic efficiency.  
By extending produce shelf life, we’re not just preserving food; we're saving money, reducing environmental impact, and investing in a more sustainable future. 

Damdam, A; Al-Zahrani, A; Salah, L; Salama, KN. 2023. Effect of combining UV-C irradiation and vacuum sealing on the shelf life of fresh strawberries and tomatoes. J. Food Sci. 88(2):595-607.