Browsing by Author "Jayasundera, A.C.A."

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    Development and Evaluation of the Effectiveness of a Kappaphycus alvarezii Seaweed- based Coating Solution for the Shelf-life Extension of Banana (Variety: Cavendish)
    (Uva Wellassa University of Sri Lanka, 2021) Hettiarachchi, H.A.S.U.; Liyanage, A.L.C.J.; Jayasundera, A.C.A.
    Application of biodegradable coating solutions is a novel approach to extend the shelf life of fresh fruits and vegetables. A variety of raw materials are used to develop cost effective coating materials. Studies focusing on the development of seaweed-based coatings are still scarce in Sri Lanka. Therefore, the aims of the present study are to formulate fruit coating material from Kappaphycus alvarezii seaweed using glycerol as the plasticizer and to determine the applicability of formulated coating for the shelf life extension of Cavendish bananas. Seaweed extract(obtained by hot water extraction) and 10%, 15% and 20% (V/W) glycerol concentrations were used to produce three different types of coating solutions (glycerol concentrations were selected based on potential bioplastic strength). Cavendish bananas (ripening index 5) were coated with the prepared coating solutions and percentage weight loss, change in firmness (fruit hardness tester), total soluble solid (TSS) content (refractometer) and the peel browning (visual observation) were evaluated for six days. Percentage weight loss was highest for non-coated bananas compared to coated bananas and the least weight loss was observed in the bananas coated with 20% glycerol added coating solution (p<0.05). After six days of storage, total percentage weight loss of non-coated bananas was 23.97% and 11.54% for bananas coated with 20% glycerol added coating solution. A continuous loss in fruit firmness was observed in all the four types of samples. The rate of firmness reduction was highest (32%) in non-coated bananas than coated bananas (p<0.05). There was a significant difference in TSS content of non-coated bananas compared to coated bananas during storage (p<0.05). The rate of TSS increment was higher (8%) in non-coated bananas than coated bananas. Lowest degree of peel browning was observed in the banana coated with 20% glycerol added film forming solution while peel browning was greatest in control samples. Accordingly, percentage weight loss, loss of firmness and peel browning can be effectively reduced by applying seaweed- based coating solutions. Effectiveness of coating solution increases with the increasing glycerol content. It can be concluded that the 20% glycerol incorporated coating solution is a viable coating material for the shelf life extension of Cavendish bananas Keywords: Coating solutions; Glycerol; Kappaphycus alvarezii; Seaweeds; Shelf life extension
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    Effectiveness of Activity Based Learning in Grade 10 Science: A Case Study in Maho Education Zone
    (Uva Wellassa University of Sri Lanka, 2021) Illankoon, I.M.A.A.; Chandrasena, W.D.; Jayasundera, A.C.A.
    Science is an important subject for students in all grades from primary to secondary level. Science is a core subject in General Certificate of Education Ordinary Level (G.C.E. O/L). However, the students‟ achievement level of G.C.E. (O/L) science is less than the expected level. The aim of this study was to investigate the effectiveness of activity-based learning on Grade 10 science comparison to traditional learning with their motivation towards meaningful learning. The mixed methods approach was used for this study with experimental study design. The sample consisted of 142 Grade 10 students selected from a Type 1AB school and a Type C school. A pre-test was conducted to divide the sample into experimental and control groups. The study was carried out for four selected units in Grade 10 Science using activity-based teaching in the experimental group while using the traditional lecture-based method for the control group. A post-test was given to measure the students‟ performance after the intervention. Students‟ motivation towards science was investigated through a questionnaire with Likert scale. Qualitative data were collected through semi-structured interviews, informal interviews and observations. Six teachers and two in-service advisors participated for semi-structured interviews. Paired sample t-test and independent sample t-test for pre-test and post-test marks was conducted to test the difference between students‟ performance of two groups. T-tests were used to analyze quantitative data whereas content analysis technique was used to analyze qualitative data. The academic achievement for both groups were positively increased with compared to initial level. Moreover, motivation towards science learning of students in the experimental group increased significantly (p =.000). The study reveals that activity-based learning has a positive effect on students‟ performance and student motivation in learning science. Hence, the study suggests to focus on activity-based learning to empower students‟ meaningful learning in science. Keywords: Activity based learning; Science; students‟ performance; Student‟s motivation