http://localhost:8080/xmlui/handle/123456789/36 Wed, 08 Apr 2026 10:49:18 GMT 2026-04-08T10:49:18Z http://localhost:8080/xmlui/handle/123456789/2164 Standardisation and evaluation of thermal and non-thermal processing of ripe jackfruit Saranya S; Sudheer, K P (Guide) Wed, 01 Jan 2025 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2164 2025-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2080 Thermal and non-thermal extraction and pasteurization of red dragon fruit juice Nithay C; Sudheer, K P (Guide) This thesis entitled “Thermal and non- thermal extraction and pasteurization of red dragon fruit juice” investigates the application of novel non-thermal and thermal processing technologies—pulsed electric field (PEF), ultrasound (US), and retort pasteurization—for enhancing juice extraction, preservation, and storage stability in red dragon fruit (Hylocereus polyrhizus). Due to the fruit's high perishability and complex pulp structure, traditional extraction methods often compromise juice yield and quality. The study aimed to (1) optimize US and PEF pretreatment parameters to maximize juice extraction, (2) evaluate PEF and retort pasteurization for quality preservation and enzyme inactivation, and (3) assess the shelf life of treated juices during refrigerated storage. Experimental results revealed that US pretreatment (40 % amplitude and 10 min treatment time) significantly enhanced juice yield (72.83%) and retention of bioactive compounds - betacyanins (10.08%), total phenolics (19.13%), and antioxidant activity (12.33%) - outperforming PEF pretreatment. PEF pasteurization (40 kV/cm, 21 μs, 600 pulses) effectively inactivated polyphenol oxidase (14.6%) and peroxidase (7.2%) while preserving nutritional quality. Retort pasteurization (90°C, 5 min) provided superior microbial stability, retaining over 90% of phenolics and antioxidant activity post- processing. Storage studies over two months confirmed better retention of betacyanins and antioxidant activity in PEF-treated juice, though retort pasteurization better controlled microbial growth. FTIR analysis and sensory evaluation supported the preservation of molecular and sensory quality in both treatments. Economic analysis indicated that both PEF and retort pasteurization are commercially viable, as they exhibit equal benefit-cost ratios. The findings establish ultrasound-assisted extraction and PEF pasteurization as promising technologies for producing high-quality, functional dragon fruit juice, while retort processing offers cost-effective shelf life extension. This research provides a foundation for scaling innovative processing methods in the functional beverage industry. Wed, 01 Jan 2025 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2080 2025-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2066 Accelerated ageing cocoa mucilage wine through hydrodynamic cavitation HYDERALI SHIHABUDHEEN; Prince, M V (Guide) Rich in bioactive substances with anti-inflammatory and antioxidative qualities, cocoa (Theobroma cacao L.) is an essential plantation crop and export commodity. As a sustainable substitute for soft drinks, cocoa wine can be made from the byproducts of cocoa processing, such as mucilage, a nutrient-rich pulp that surrounds the beans. By employing bubble implosion, hydrodynamic cavitation (HC) a new green technology, was used to speed up wine ageing and cause notable physicochemical changes. Hence this study is proposed to develop a suitable equipment system for small scale accelerated ageing effects on the cocoa mucilage wine. The study mainly concentrated on the development of a hydrodynamic cavitation reactor system for the accelerated ageing of cocoa mucilage wine. The system includes a storage tank, a pump system, various cavitation elements with different geometries, a digital flow meter, pressure gauges and a piping assembly. Its operation relies on the cavitation effect, which is induced in the fluid flowing through a closed pipe at varying operating pressures. The accelerated aging of cocoa mucilage wine is performed by the combined action of temperature and pressure generated inside the cavitation element. In this study, three different process parameters with three levels were selected for the accelerated ageing of cocoa mucilage wine viz. process pressure (3,3.5 and 4 bar), time of flow (30,45 and 60 mins) and type of cavitation element such as slit venturi, elliptical venturi and orifice were optimised using central composite design combined with response surface methodology. The optimized process parameters obtained for hydrodynamic cavitation were process pressure (3.26 bar) and time of flow (47.6991 mins) in the slit venturi. Characteristic study of accelerated aged cocoa mucilage wine, conventionally aged wine and untreated wine were carried out to obtain the quality as well as the proximate composition. Various quality parameters like TPC, ascorbic acid, antioxidant activity, reducing sugar content, pH, TSS, colour etc. were determined for all the three wines. Sensory evaluation revealed that the optimized HC-treated wine attained the highest overall acceptability score in comparison to the conventionally aged and fresh wine samples. The production cost of one liter of accelerated aged cocoa mucilage wine using HC treatment was estimated at ₹227.105/-. The developed HC reactor system was economically feasible and commercially exploited. The developed hydrodynamic cavitation reactor system was highly efficient and feasible. Wed, 01 Jan 2025 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2066 2025-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2064 Standardisation and evaluation of thermal and non-thermal processing of ripe jackfruit Saranya S; Sudheer, K P (Guide) Wed, 01 Jan 2025 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2064 2025-01-01T00:00:00Z