Browsing by Author "Obajemihi, O.I."
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Item Effect of storage environment and packaging media on the disease incidence and weight loss of stored African star apple (Chrysophyllum albidum)(Arid Zone Journal of Engineering, Technology and Environment, 2016) Sunmonu, M.O.,; Odewole, M.M.,; Obajemihi, O.I.; Ajala, E.O.A study was conducted to study the effect of storage environment and packaging media on the disease incidence and weight loss of stored African Star Apple (Chrysophyllum albidum). Three storage environments were identified in this study namely- evaporative cooling basket, refrigerator and ambient storage and freshly harvested ripe African star apples were wrapped in perforated polythene, moist jute material and without packaging and stored under these three storage environment. The apples were observed for deteriorations mediated by microbial infection and insect infestation. Manifestation of infestation which affected the shelf-life of African Star Apple was delayed most in the refrigerator. The level of infestation of the apples stored in evaporative cooling basket was next to the refrigerator in the decreasing order. Weight losses were lower in apples wrapped with moist jute sack (0.48% ± 1.6) stored in refrigerator than those wrapped with perforated polythene (0.79% ± 1.2) and unwrapped (1.45% ±1.4). Similar wrapping effects were obtained in the evaporative cooling basket and ambient. Weight losses were lower in apples stored in refrigerator (0.91%) than in the evaporative cooling basket (2.84 %) and ambient shade (7.41 %).Item Growth Inhibitory Properties and Antimicrobial Evaluation of Aloe schweinfurthii (Baker)(Journal of Pharmacy and Bioresources, 2020) Salawu, K.M.; Oyerinde, A.A.; Aliyu, A.; Obajemihi, O.I.Cancer and infectious diseases combined are leading cause of death and public health concern. In developing countries, about 80% of the populace depends on medicinal plants for their general health care needs including treatment of infectious diseases and cancer. Aloe schweinfurthii (Aloaceae) is a small medicinal herb that is commonly used for the treatment of cancerous and infectious diseases in South-West Nigeria. The focus of this study was to evaluate the growth inhibitory and antimicrobial activities of the herb. The rind of the herb was collected, air dried, pulverized and extracted into distilled methanol by cold maceration. The dried extract obtained was subjected to growth inhibitory and antimicrobial assays. The extract displayed concentration dependent growth inhibitory activity with IC50 of 484.7±2.16 and 1188±2.32µg/mL compared to cyclophosphamide with IC50 of 174.3±0.19 and 834.5±0.84 µg/mL in Sorghum bicolor radical and Allium cepa root growth inhibitory assays, respectively. The extract displayed concentration dependent antibacterial and antifungal effects with the highest activity against C. freundi (18 mm zone of inhibition) at 50 mg/mL. The extract of Aloe schweinfurthii leaf rind displayed marked growth inhibitory and antimicrobial bioactivities. The extract maybe considered as a viable candidate for discovery of chemotherapeutic agent (s).Item Modeling and optimization of drying rate and quality parameters of dried osmo-pretreated green bell pepper (Capsicum annuum)(Nigerian Journal of Pure and Applied Science, 2016) Odewole, M.M.; Ajala, E.O.; Obajemihi, O.I.; Adeyinka-Ajiboye, O.; Oyeniyi, S.K.A study on modeling and optimization of osmotic dehydration and drying of green bell pepper was carried out. Five levels of osmotic process durations (60 min, 90 min, 120 min, 150 min and 180 min) and five levels of osmotic solution concentrations (5% (w/w), 10% (w/w), 15% (w/w), 20% (w/w) and 25% (w/w) as input parameters were used. Design Expert 8.0.3 version was used to design the experiment in order to get all possible combinations of durations and concentrations. After pretreating all samples of fresh green pepper in hypertonic osmotic solution concentrations of NaCl for the required durations, they were all dried at 50˚C in a fabricated cabinet dryer. The following output parameters were modeled and optimized with Design Expert 8.0.3 version: drying rate, vitamin C, crude protein, crude fibre, fat, ash content, water loss, solid gain, shrinkage and rehydration ratio. Ten (10) model equations, one for each of the output parameters were developed, and checked for adequacy and validity. All developed model equations were found to present functional relationships between input and output parameters. Hence, all developed model equations can be used as reliable tools for estimating, predicting and conducting analysis of the process. Best optimized results were selected based on desirability (0 - 1). Drying rate (maximized), vitamin C (maximized), crude protein (maximized), crude fibre (maximized), fat (maximized), ash content (minimized), water loss (maximized), solid gain (maximized), shrinkage (minimized) and rehydration ratio (maximized) got desirability of 0.889, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 0.85, 0.734 and 0.868 respectively.