ABSTRACTThe study was designed to develop functional cucumber and pomegranate based ready-to-serve (RTS) drink as thirst quencher. To boost antioxidant activity and to add natural preservation to the ...drink, microwave-assisted extracts of herbs and spices; mint, lemongrass, ginger, cinnamon were incorporated either individually or collective, at an equivalent dose of 2% for comparison. In this regard, ginger extract incorporated drink maintained its storage quality owing to highest free radical scavenging potential (49 to 67%) in relevance to highest polyphenol and flavonoid contents (1203 ± 64 mg GAE/L and 178 ± 8 mg TE/L, respectively). Whereas, ascorbic acid was maximally recorded in lemongrass-based drink 22 ± 1 mg/100 mL. During 30 days storage under refrigeration, significant decrease was recorded in pH of the RTS drink along with considerable increase in acidity and browning index however, total soluble solids demonstrated non-significant pattern. Sedimentation showed an inclining trend (p˂.05) with progression in storage but comparatively less sedimentation was attributed to lemongrass incorporated drink followed by cinnamon containing drink. Turbidity also indicated significant changes but showed inverse pattern with respect to sedimentation. Additionally, ginger-based drink expressed considerably low total plate count as 2.3 ± .1 log CFU/mL with nil yeast and mold growth by all the extracts throughout storage. Further, ginger portrayed highest rate for odor, taste and consistency though, mixed herbs and spices based drink attained the best color score. Conclusively, ginger-based drink portrayed maximum antioxidant and antimicrobial properties.
Celotno besedilo
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Cyanobacteria capable of oxygenic photosynthesis uses multiple pigments to efficiently convert light radiation energy to chemical energy in the form of ATP (Adenosine Tri-phosphate). A crucial ...pigment protein from its photosynthetic machinery called phycocyanin has been extensively studied for its immense application in fluorescent probe, food additives, nutraceutical applications, and silver-nanoparticles production. The present review provides a narrative amalgamation of the said applications and technologies to grow, extract, and purify the phycocyanin from various algal cultures. The expression of phycocyanin protein gene at the molecular level has been discussed for its potential to enhance the yield and stability. Furthermore, advantageous methods for the extraction and purification of phycocyanin from possible host cyanobacterial strains (Spirulina platensis, Cyanidium caldarium, Synechococcus vulcanus, Gracilaria chilensis, Polysiphonia urceolata, Thermosynechcoccus vulcanus, and Galdieria sulphuraria) such as physical, chemical and enzymatic methods are also compared to find the most efficient strategy in subsequent scientific applications. The comparative study also expects to ways to achieve sustainable development goal 3 i.e. good health & wellbeing.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
High-density polyethylene (HDPE) waste poses a significant environmental challenge due to its non-biodegradable nature and the vast quantities generated annually. However, conventional recycling ...methods are energy-intensive and often yield low-quality products. Herein, HDPE waste is upcycled into anti-aging, superhydrophobic thin films suitable for outdoor applications. A two-layer spin-casting method combined with heating-induced crosslinking is utilized to produce an exceptionally rough superhydrophobic surface, featuring a root mean square (RMS) roughness of 50 nm, an average crest height of 222 nm, an average trough depth of −264 nm, and a contact angle (CA) of 148°. To assess durability, weathering tests were conducted, revealing the films’ susceptibility to degradation under harsh conditions. The films’ resistance to environmental factors is improved by incorporating a UV absorber, maintaining their hydrophobic properties and mechanical strength. Our research demonstrates a sustainable method for upcycling waste into high-performance, weather-resistant, superhydrophobic films.
The current review has been considered to extract the bioactive compounds from different fruits and vegetable waste using novel extraction techniques. Among all horticultural crops, fruits and ...vegetables are the most consumed. Due to a rising population and changing dietary patterns, the production and processing of horticultural commodities, particularly fruits and vegetables, has expanded dramatically in order to meet rising demand. Food waste is the by-product of numerous industrial, agricultural, domestic, and food operations sector that is steadily increasing as these activities rise. Seeds, skin, rind, and pomace make up the majority of the waste, which is rich in bioactive substances such as carotenoids, polyphenols, dietary fibers, vitamins, enzymes, and oils. Waste can be used to make a variety of vital bioactive components, which is an important step toward long-term development. For the extraction of bioactive compounds, various extraction technologies are being used, including supercritical fluid extraction, subcritical water extraction, enzyme assisted extraction, ultrasound and microwave assisted extraction. The sustainable extracts attained using different technologies are valuable in the formation of functional food. Conclusively, new technologies manage waste in a meaningful way that is collected from fruits and vegetables. However, these bioactive compounds that are attained from wastes are valuable in the formation of food products.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Recycling low-end, one-time-use plastics-such as low-density polyethylene (LDPE)-is of paramount importance to combat plastic pollution and promote sustainability in the modern green economy. This ...study valorizes LDPE waste by transforming it into 3D oleophilic swellable thin films through a process involving dissolution, phase separation, and extraction. These films are subsequently layered using a customized polypropylene (PP) based nonwoven fabric separator and securely sealed in a zigzag pattern. The zigzag-shaped seal enhances the adhesion of pollutants to the sorbent by providing wire curvatures that increase retention time and uptake capacity. As a result, the sorbent exhibits impressive oil uptake capacities, with immediate and equilibrium values of 120
/
and 85
/
, respectively. Notably, the as-prepared sorbent demonstrates low water retention and high selectivity for oil, outperforming commercially available oil sorbents. The unique design involving a 3D-film structure, superposed films, and a zigzag-shaped seal offers a sustainable and value-added solution to the issues of LDPE waste and oil spills on water surfaces.
The use of Polypropylene PP in disposable items such as face masks, gloves, and personal protective equipment has increased exponentially during and after the COVID-19 pandemic, contributing ...significantly to microplastics and nanoplastics in the environment. Upcycling of waste PP provides a useful alternative to traditional thermal and mechanical recycling techniques. It transforms waste PP into useful products, minimizing its impact on the environment. Herein, we synthesized an oil-sorbent pouch using waste PP, which comprises superposed microporous and fibrous thin films of PP using spin coating. The pouch exhibited super-fast uptake kinetics and reached its saturation in fewer than five minutes with a high oil uptake value of 85 g/g. Moreover, it displayed high reusability and was found to be effective in absorbing oil up to seven times when mechanically squeezed between each cycle, demonstrating robust oil-sorption capabilities. This approach offers a potential solution for managing plastic waste while promoting a circular economy.
Porous adsorbent (PA) with high specific surface area and calcite surface was prepared from an industrial waste, electric arc furnace oxidizing slag (EOS). As the EOS is composed of silica and metal ...oxide nanoparticle like CaO, MgO, and so on, the metal oxide parts were selectively dissolved by acid treatment. The remained silica part exhibited porous structure due to the assembly of nanoparticles. Then, calcite was developed on the silica surface by simply titrating the silica framework with carbonate under basic condition. According to the x‐ray diffraction pattern and scanning electron microscopy, we could hypothesize that the EOS had dense texture of amorphous nanoparticles. On the other hand, the PA had well‐crystallized calcite particles with sufficient interparticle pores. The zeta potential of EOS shifted to positive region upon transformation to PA, possibly due to the change in surface‐exposed moiety from silica to calcite. The albumin adsorption profiled exhibited that the PA had very high protein adsorption capacity up to 3.33 mg‐protein/mg‐adsorbent at 5 mg/L of protein concentration, while the EOS itself did not show meaningful adsorption.
Porous adsorbent (PA) was prepared from electric arc furnace oxidizing slag (EOS) that composed of silica and metal oxide nanoparticles. EOS is treated with acid to dissolve the metal oxide and resulted in porous silica. To grow calcite on the surface of, it is titrated with base having carbonate. The surface changed from silica to porous calcite showed by shifting the curve toward positive region. PA was applied for albumin adsorption and resulted into high adsorption capacity of 3 mg‐protein/mg‐adsorbent.
In this work, we present a generalized formulation of the Slepian concentration problem on the sphere for finding band-limited functions with an optimal concentration in the spatial domain. By ...introducing weighting functions in the formulation of classical Slepian concentration problem and assigning different values to these weighting functions, we present two variants of the concentration problem namely the differential and the weighted Slepian concentration problem. In the differential Slepian concentration problem, we consider two regions on the sphere and find band-limited functions such that the energy is maximized in one region at the expense of the energy in the other region. We propose non-negative weighting using a spatial window function to formulate and solve the weighted Slepian concentration problem. Each problem can be solved by formulating it in the harmonic domain as an eigenvalue problem, the solution of which yields eigenfunctions that serve as alternative basis functions for the representation of band-limited signals and are referred to as Slepian functions. We also present and analyse the properties of the Slepian functions. To support the applications in acoustics and cosmology, we also provide a demonstration for the use of the proposed Slepian functions for the robust signal modeling and the estimation of the energy spectrum of red and white stochastic processes on the sphere.
In this paper, we develop an analytical formulation for the Slepian spatial-spectral concentration problem on the sphere for a limited colatitude-longitude spatial region on the sphere, defined as ...the Cartesian product of a range of positive colatitudes and longitudes. The solution of the Slepian problem is a set of functions that are optimally concentrated and orthogonal within a spatial or spectral region. These properties make them useful for applications where measurements are taken within a spatially limited region of the sphere and/or a signal is only to be analyzed within a region of the sphere. To support localized spectral/spatial analysis, and estimation and sparse representation of localized data in these applications, we exploit the expansion of spherical harmonics in the complex exponential basis to develop an analytical formulation for the Slepian concentration problem for a limited colatitude-longitude spatial region. We also extend the analytical formulation for spatial regions that are comprised of a union of rotated limited colatitude-longitude subregions. By exploiting various symmetries of the proposed formulation, we design a computationally efficient algorithm for the implementation of the proposed analytical formulation. Such a reduction in computation time is demonstrated through numerical experiments. We present illustrations of our results with the help of numerical examples and show that the representation of a spatially concentrated signal is indeed sparse in the Slepian basis.
ABSTRACTPakistan is one of the biggest mango producing country in the world. Post-harvest losses of mango occur due to lack of storage facilities. Mango can be converted into concentrate to utilize ...it for longer period. In the current study, the physicochemical profile and storage stability of mango concentrate was investigated to evidence the opportunity of preservation method. Three different concentrations (0.1%, 0.2%, and 0.5%) of citric acid, sodium benzoate and potassium sorbate were applied. All chemical preservatives significantly (p ˂ 0.05) increased viscosity, total soluble solids (TS), reducing sugar (RS), non-reducing sugar (NRS), total soluble solids (TSS), and titratable acidity (TA), while the moisture content, pH, DPPH antioxidant activity, TPC (total phenolic content), TFC (total flavonoid content) and the level of texture acceptance decreased during the storage. The moisture content was decreased from 43.4% to 34.9% during storage. Phytochemical analysis showed that mango concentrate is a potential source of antioxidant compounds and has higher DPPH radical scavenging activity. Regarding preservation solution, it is suggested that sodium benzoate and citric acid might be utilized for industrial applications.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
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