Standardisation of postharvest treatments to extend the shelf life of rambutan (Nephelium lappaceum L.) (Record no. 289715)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 03635nam a22001817a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.56 |
| Item number | FAT/ST PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Fathima Sajan |
| 245 ## - TITLE STATEMENT | |
| Title | Standardisation of postharvest treatments to extend the shelf life of rambutan (Nephelium lappaceum L.) |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellayani |
| Name of publisher, distributor, etc | Department of Post Harvest Technology, College of Agriculture |
| Date of publication, distribution, etc | 2021 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 93p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 ## - SUMMARY, ETC. | |
| Abstract | The study entitled Standardisation of postharvest treatments to extend the shelf life of rambutan (Nephelium lappaceum L.) was conducted in the Department of Post Harvest Technology, College of Agriculture, Vellayani during 2019-21 with the objective to reduce spintern browning and shelf life extension of rambutan through standardisation of postharvest treatments. Rambutan fruits of medium size harvested at commercial maturity, as determined by pericarp colour (redness) were selected for the study. Rambutan fruits after cleaning and sanitization (ozonation 2 ppm), were subjected to postharvest treatments viz., edible coating with aloe gel (10, 25, 50%), chitosan (0.5, 1, 2%) and oxalic acid (5, 7.5 and 10%) as dipping for 5 minutes. The pre-treated rambutan fruits after air drying to remove excessive surface moisture were stored in CFB boxes at room temperature. Physiological loss in weight, browning score, general appearance (visual parameters) and internal fruit quality were analysed daily till the end of shelf life and biochemical parameters were analysed initially and at the end of shelf life. Physiological Loss in weight increased during the storage period and after two days of storage oxalic acid treated fruits recorded the highest PLW (16.74%) with the highest browning score and were discarded due to spoilage. After fourth day of storage, the treatment with 50% aloe gel recorded the lowest PLW of 18.19%. Acidity (0.40%), moisture content (79.05%) of fruits decreased during storage and 50% aloe gel coated fruits recorded the highest TSS value of 17.98⁰ Brix and lowest value of 15.81⁰Brix was recorded for the fruits treated with 10% oxalic acid. The highest retention of total sugar (20.75%), reducing sugar (3.14%), vitamin C (22.69 mg 100g-1 ) and antioxidant activity (68.85%) was recorded for 50% aloe gel treated fruits at the end of shelf life. Based on the physiological, biochemical and sensory parameters, the best treatment from each section of chemicals selected for storage studies were 50 % aloe gel, 0.5% chitosan and 5% oxalic acid. Pre-treated rambutan fruits packaged in ventilated polypropylene were stored in CFB boxes under refrigerated condition of 12±1⁰ C. The fruits treated with aloe gel 50% recorded the lowest PLW of 9.33 %, and the highest TSS (16.96⁰ Brix), acidity (0.30 %), moisture content (80.08%), total sugar (17.67%), reducing sugar (2.84%), vitamin C (19.42 mg 100 g-1 ) followed by the chitosan (0.5%). The postharvest treatments did not show any effect on easiness of peeling and easiness of separation of pulp from seed. The lowest browning score and higher score for organoleptic qualities as well as appearance was recorded for the aloe gel (50%) treated fruits. Harvested rambutan fruits treated with 50 % aloe gel and pre-packaged in ventilated polypropylene, stored in CFB boxes under refrigerated storage of 12±1⁰C could extend the shelf life up to 16 days with minimum spintern browning and nutritional loss. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Post Harvest Technology |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Rambutan |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Nephelium lappaceum |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | P R Geetha Lekshmi (Guide) |
| 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 | Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2022-07-16 | 631.56 FAT/ST PG | 175384 | 2022-07-16 | Theses |