Thermal and non thermal extraction and pasteurization of red dragon fruit juice (Record no. 374109)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 02896nam a22002297a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.56 |
| Item number | NIT/TH Ph.D |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Nithya, C |
| 245 ## - TITLE STATEMENT | |
| Title | Thermal and non thermal extraction and pasteurization of red dragon fruit juice |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Tavanur |
| Name of publisher, distributor, etc | Department of Processing and Food Engineering, Kelappaji College of Agricultural Engineering and Food Technology |
| Date of publication, distribution, etc | 2025 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 284p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Ph.D |
| 520 3# - SUMMARY, ETC. | |
| Abstract | 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 (Hylocereuspolyrhizus). Due to the fruit's high perishability and complex pulp structure, traditional extractionmethodsoftencompromisejuiceyieldandquality.Thestudyaimedto(1)optimize USandPEFpretreatmentparameterstomaximizejuiceextraction,(2)evaluatePEFandretort pasteurizationforqualitypreservationandenzymeinactivation,and(3)assesstheshelflifeof 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,21μs,600pulses)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 andretortpasteurizationarecommerciallyviable,astheyexhibitequalbenefit-costratios.The findings establish ultrasound-assisted extraction and PEF pasteurization as promising technologiesforproducing 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. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Processing and Food Engineering |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Thermal and non thermal extraction |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Pasteurization |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Red dragon fruit juice |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Red dragon |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Fruit juice |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Sudheer, K P(Guide) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://krishikosh.egranth.ac.in/handle/1/5810228219 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Item type | Theses |
| Not for loan | Collection code | Permanent location | Current location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Thesis | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Technical Processing Division | 2025-10-08 | 631.56 NIT/TH Ph. D | 176608 | 2025-10-08 | Theses |