Applied Sciences

Functional and antiglycation properties of cow milk set yogurt enriched with Nyctanthes arbor-tristis L. fower extract

2023-01-25T11:12:17Z

Functional and antiglycation properties of cow milk set yogurt enriched with Nyctanthes arbor-tristis L. fower extract Amadarshanie, D.B.T.; Gunathilaka, T.L.; Silva, R.M.; Navaratne, S.B.; Peiris, L.D.C. The fortifcation of yogurt with natural herbs to improve its nutritional and health beneft are an emerging trend. Hot infusions of Nyctanthes abo-tristis fowers are a traditionally used herb against diabetes. This study was designed to develop a novel yogurt fortifed (FY) with 3, 3.5, and 6% N.arbor-tristis fower extract (NFE) to determine its suitability as a fortifer en route to innovative functional products. Upon fermentation, the highest sensory scores were obtained for the 3.5% NFE-FY with 11-, 6-, 3-fold higher antiglycation (NFE- IC50: 28.04 ± 1.13 μg/mL and 3.5% NFE-FY IC50: 46.80 ± 0.92 μg/mL) activity, free radical scavenging potentials, and total phenolic content, respectively. An improvement of texture profle values was observed in 3.5% NFE-FY compared to the control with 3.00 ± 0.1% fat, 3.88 ± 0.23% crude protein, 77.94 ± 0.09 moisture, 14.97 ± 0.27 total soluble solids, and 0.7637 ± 0.03 ash. The 3.5%NEF-FY also exhibited a longer shelf life and less microbial growth than the control. The GC-MS analysis of the NFE indicated the presence of phytochemicals essential for the observed bioactivity. The results confrmed that the N.arbor-tristis fower extract increased the overall quality of the yogurt and tested bioactivity. NFE-FY could be used in yogurt production to optimize the health benefts with improved functional characteristics to prevent diet-driven glycation activity.

Integration of in vitro and in‑silico analysis of Caulerpa racemosa against antioxidant, antidiabetic, and anticancer activities

2023-01-25T11:08:33Z

Integration of in vitro and in‑silico analysis of Caulerpa racemosa against antioxidant, antidiabetic, and anticancer activities Dissanayake, I.H.; Bandaranayake, U.; . Keerthirathna, L.R.; Manawadu, C.; Silva, R.M.; Mohamed, B.; Rizwan, A.; Peiris, D.C. Marine algae are found to be excellent in their nutritional and potential therapeutic properties. This study explores the antidiabetic and anticancer potential of fractionated polyphenolic extract of Caulerpa racemosa, green macroalgae. Crude polyphenolic extract (CPE) of C. racemosa and its fractions (n-hexane, ethyl acetate, chloroform, and distilled water) were tested for its total phenol and favonoid contents and antioxidant potential. The ethyl acetate fraction was subjected to gas chromatography/mass spectrometry (GC/MS). The in vitro antidiabetic activity was assessed by alphaamylase, glucosidase inhibition and anti-glycation assays. Also, in-silico studies were conducted to test the binding afnities between caulerpin with alpha-glucosidase enzyme and estrogen receptor (ER) active sites. Each fraction was tested for its in vitroin vitroanticancer activity by CellTiter-Glo and MTT cell proliferation assays. The total phenolic and favonoid contents and the antioxidant potential of the crude extract were observed to be dose dependent. The GC/MS analysis of the ethyl acetate fraction yielded 47 peaks, whereas n-hexadecanoic acid and hexadecanoic acid methyl ester showed the highest compatibility percentages of 99% and 96%, respectively. The CPE exhibited a higher potential in both alpha-amylase inhibitory and anti-glycation activities. The ethyl acetate fraction was more efective against alpha-glucosidase inhibition. Molecular docking revealed a high binding afnity between the alpha-glucosidase enzyme and caulerpin and showed high binding afnity toward caulerpin, with H-bond interactions. The in vitro anticancer analyses revealed that chloroform fraction and CPE exhibited moderate activity on the KAIMRC1 cell line. Also, the CPE exhibited high specifcity compared to the standard drug in anticancer studies. Our fndings evidence the pharmacological potential of the CPE of C. racemosa, and bioactive compounds of the species may be utilized as lead molecules to develop anti-diabetic and anti-cancer drugs.

In silico study of SARS‐CoV‐2 spike protein RBD and human ACE‐2 affinity dynamics across variants and Omicron subvariants

2023-01-25T11:03:49Z

In silico study of SARS‐CoV‐2 spike protein RBD and human ACE‐2 affinity dynamics across variants and Omicron subvariants Abeywardhana, S.; Premathilaka, M.; Bandaranayake, U.; Perera, D.; Peiris, L.D.C. The coronavirus disease 2019 virus outbreak continues worldwide, with many variants emerging, some of which are considered variants of concern (VOCs). The WHO designated Omicron as a VOC and assigned it under variant B.1.1.529. Here, we used computational studies to examine the VOCs, including Omicron subvariants, and one variant of interest. Here we found that the binding affinity of human receptor angiotensin‐converting enzyme 2 (hACE2) and receptor‐binding domain (RBDs) increased in the order of wild type (Wuhan‐strain) < Beta < Alpha < OmicronBA.5 < Gamma < Delta < Omicron BA.2.75 < BA.1 < BA.3 < BA.2. Interactions between docked complexes revealed that the RBD residue positions like 452, 478, 493, 498, 501, and 505 are crucial in creating strong interactions with hACE2. Omicron BA.2 shows the highest binding capacity to the hACE2 receptor among all the mutant complexes. The BA.5's L452R, F486V, and T478K mutation significantly impact the interaction network in the BA.5 RBD‐hACE2 interface. Here for the first time, we report the His505, an active residue on the RBD forming a salt bridge in the BA.2, leading to increased mutation stability. When the active RBD residues are mutated, binding affinity and intermolecular interactions increase across all mutant complexes. By examining the differences in different variants, this study may provide a solid foundation for structure‐based drug design for newly emerging variants.

Construction timber in Sri Lanka - future trends and technologies

2023-01-13T19:00:34Z

Construction timber in Sri Lanka - future trends and technologies Amarasekera, Hiran The Chamber of Construction Industry of Sri Lanka together with the University of Sri Jayewardenepura, Department of Forestry and Environmental Sciences, conducted a seminar on “Trends in Treatment of Wood and Wood-Based Products for the Construction Industry of Sri Lanka” The seminar was held on the 10th of January 2023 at the Sri Lanka Foundation commencing 1.00pm. Construction Timber has evolved over time from traditional usage to one “engineered wood” which is considerably stronger and more stable than regular wood. Thus it allows builders, architects, and designers to build better and bigger. This has opened up possibilities for the current use of construction timber to open up with future technologies. Prof. Hiran Amarasekara, broadly outlined this topic in his opening address at this seminar.