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Sulakkana Wanshapaly Rathnayake,Sithara Rasanjali Sirimanna,Chamari Thathsaramala Dissanayake 한국해양과학기술원 2022 Ocean science journal Vol.57 No.1
This study assesses the abundance of fish in different habitats of Negombo Lagoon, a human-influenced, highly productive tropical lagoon in Sri Lanka, and the effects of physico-chemical parameters on their abundance. Six different habitats, i.e., three mangrove habitats, seagrass bed associated habitat, brushpile, and mud and sand flat were selected as sampling sites representing three major areas, Kadolkele, Dungalpitiya, and Kepungoda. Fish were sampled using a drag net with a stretch mesh size of 50 mm and salinity, Surface Water Temperature, Dissolved Oxygen, pH, Nitrate–N and Orthophosphate were measured in each habitat from January to December 2018 by making monthly field visit. A total of 45 fish species belonging to 30 families were identified. The highest species abundance was reported in seagrass associated habitat, while the lowest was in Kadolkele mangrove habitat (p < 0.05; ANOVA) due to its low level of DO (1.92 mg dm−3) and high Orthophosphate (1.02 mg dm−3) content. Different life stages of fish shared different habitats and small juveniles were abundant in association with seagrass bed (67.09%) while mature ones were dominant (42.12%) in brushpile area. This study proves that the abundance of fish varies with different physico-chemical parameters and, according to the generalized additive model, the highest abundance of fish is in association with > DO of 4 mg dm−3, low level of Orthophosphate (0.5–0.75 mg dm−3), 0.5–1.5 mg dm−3 of Nitrate–N, and 20–30 ppt salinity. The findings of this study are important to understand the spatial and seasonal patterns of fish abundance in a tropical lagoon and how physico-chemical parameters affect their abundance.
Shan Randima Nawarathne(Shan Randima Nawarathne ),Dinesh Darshaka Jayasena(Dinesh Darshaka Jayasena ),Prabhathma Yasasvi Rathnayake(Prabhathma Yasasvi Rathnayake ),Manjula Senavirathna(Manjula Senavir 한국축산식품학회 2021 Food and Life Vol.2021 No.2
The present study was aimed to develop a value-added chicken nugget by incorporating roasted sesame seeds (RSS) and elucidate its sensory and quality parameter changes during a 28-d frozen storage. Chicken nugget samples were processed to have four treatments as; 1) Nuggets with 0% RSS (w/w) [Control], 2) Nuggets with 5% RSS (w/w) [SN5], 3) Nuggets with 10% RSS (w/w) [SN10] and 4) Nuggets with 15% RSS (w/w) [SN15] with six replications per treatment. The two best nugget samples with RSSs were selected by a sensory panel and tested for physicochemical and microbial quality changes with the control sample during a 28-d frozen storage. Results revealed that SN10 had the highest (p<0.05) crude fat (8.84%), crude protein (14.24%) and ash (3.15%) contents compared to SN5 and the control. During the 28-d frozen storage, the pH of nuggets diminished gradually (p<0.05) in all treatments. SN10 had the highest (p<0.05) thiobarbituric acid reactive substance (TBARS) value compared with its counterparts throughout the 28-d frozen storage. The TBARS values and total plate count values increased (p<0.05) in all treatments during the frozen storage, but within the acceptable limits. The water holding capacity of nuggets in all treatments decreased (p<0.05) and cooking loss increased (p<0.05) during the frozen storage. In conclusion, RSSs could be mixed up to 10% to the nugget mixture to prepare nuggets with improved proximate composition, and physicochemical and sensory properties.
이은영,Dhanushka Rathnayake,손유민,Allah Bakhsh,황영화,서정근,김철범,주선태 한국축산식품학회 2023 한국축산식품학회지 Vol.43 No.1
The present study aimed to evaluate the effects of high-intensity ultrasound (HIU) application on meat quality traits, sensory parameters, and the microstructure of semitendinosus muscle from Hanwoo cattle. The samples were treated in an ultrasonic bath (35 kHz) at an intensity of 800 W/cm2 for 60 min, followed by aging at 1℃ for 0, 3, and 7 days. The application of ultrasound resulted in lower Warner-Bratzler shear force and higher myofibrillar fragmentation index values during the storage period. HIU also enhanced the tenderness, flavor, umami, and overall acceptability of cooked beef muscle. However, the electronic tongue evaluation results showed higher umami values in the control treatment on the seventh day of storage. The microstructure of sonicated meat showed disorganized myofibrillar architecture and swelling in the A-band region of sarcomeres during the storage period, which led to greater meat tenderness. The heatmap illustrated the high abundance of α-linolenic acid (C20:5n3) and eicosapentaenoic acid (C18:3n3) in sonicated meat samples on the third day of the storage. These results showed that HIU is a potential method for tenderizing and improving the sensory attributes of beef without compromising other quality aspects.
Biological activity of peptides purified from fish skin hydrolysates
Abuine, Racheal,Rathnayake, Anuruddhika Udayangani,Byun, Hee-Guk The Korean Society of Fisheries and Aquatic Scienc 2019 Fisheries and Aquatic Sciences Vol.22 No.5
Fish skin waste accounts for part of the solid waste generated from seafood processing. Utilization of fish skin by bioconversion into high-grade products would potentially reduce pollution and economic cost associated with treating fish processing waste. Fish skin is an abundant supply of gelatin and collagen which can be hydrolyzed to produce bioactive peptides of 2-20 amino acid sequences. Bioactivity of peptides purified from fish skin includes a range of activities such as antihypertensive, anti-oxidative, antimicrobial, neuroprotection, antihyperglycemic, and anti-aging. Fish skin acts as a physical barrier and chemical barrier through antimicrobial peptide innate immune action and other functional peptides. Small peptides have been demonstrated to possess biological activities which are based on their amino acid composition and sequence. Fish skin-derived peptides contain a high content of hydrophobic amino acids which contribute to the antioxidant and angiotensin-converting enzyme inhibitory activity. The peptide-specific composition and sequence discussed in this review can be potentially utilized in the development of pharmaceutical and nutraceutical products.
Kannangara, Yasun Y.,Rathnayake, Upendra A.,Song, Jang-Kun Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.361 No.-
<P><B>Abstract</B></P> <P>Hybrid supercapacitors using metal–organic frameworks (MOFs) exhibit high power and remarkable rate capability with consistent cyclability. The key limitations in developing MOF supercapacitors are the limited number of ligands and extensive laboratory protocols for synthesis. To solve these problems, we introduce the liquid–liquid interfacial reaction method for synthesising layered MOF using <I>p</I>-phenylenediamine (pPDA) building block as an organic ligand. The method is straightforward, consumes less energy and can be deployed in a small space at room temperature. We synthesise two types of layered MOFs, Ni-pPDA and Mn-pPDA, and fabricate hybrid supercapacitors by combining the positive MOF electrodes with a negative graphite carbon (GC) electrode. The supercapacitors using Ni-pPDA//GC and Mn-pPDA//GC exhibit high performances of approximately 184.7 F/g and 109.3 F/g, respectively. In particular, the Ni-pPDA supercapacitor exhibits high energy and power densities. The supercapacitors using Ni-pPDA and Mn-pPDA MOFs exhibit the capacitive retention of about 80% and 97%, respectively, after 5000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel MOFs using <I>p</I>-phenylenediamine ligand for energy storage devices. </LI> <LI> Green synthesis via liquid–liquid interfacial reaction at room temperature. </LI> <LI> Hybrid Ni-pPDA MOF supercapacitor with excellent electrochemical performance and cycling stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Biological activity of peptides purified from fish skin hydrolysates
Racheal Abuine,Anuruddhika Udayangani Rathnayake,변희국 한국수산과학회 2019 Fisheries and Aquatic Sciences Vol.22 No.2
Fish skin waste accounts for part of the solid waste generated from seafood processing. Utilization of fish skin by bioconversion into high-grade products would potentially reduce pollution and economic cost associated with treating fish processing waste. Fish skin is an abundant supply of gelatin and collagen which can be hydrolyzed to produce bioactive peptides of 2–20 amino acid sequences. Bioactivity of peptides purified from fish skin includes a range of activities such as antihypertensive, anti-oxidative, antimicrobial, neuroprotection, antihyperglycemic, and anti-aging. Fish skin acts as a physical barrier and chemical barrier through antimicrobial peptide innate immune action and other functional peptides. Small peptides have been demonstrated to possess biological activities which are based on their amino acid composition and sequence. Fish skin-derived peptides contain a high content of hydrophobic amino acids which contribute to the antioxidant and angiotensin-converting enzyme inhibitory activity. The peptide-specific composition and sequence discussed in this review can be potentially utilized in the development of pharmaceutical and nutraceutical products.