Judul: Study Of Postharvest Quality Changes Of Mangosteen Fruit (Garcinia Mangostana L.) At Several Stage Of Maturity And Storage Temperature
Abstrak: Domestic and export market opportunities for fresh mangosteen fruit can be satisfy if the harvest and postharvest handling precise. Harvest based on the maturation stage will determine the freshness of the fruit, and storage at the right temperature can extend storage period. The purpose of this research are (1) to study the proper maturation stage to extend the shelf life of fruit, (2) to study the proper storage temperature to extend the shelf life and maintain the quality, (3) to search the effects of the optimum combination between the maturition stage and storage temperature to maintain the quality of fruit. This experiment was laid out on completely randomized design with two factors, the first factor is maturation stage of fruit consist of stage 1, 2, 3 and 4. The second factor is storage temperature consist of: 15oC and room temperature. The result showed that harvesting maturation stage 1 can extend the shelf life of mangosteen fruit than in maturation stage 2, 3 and 4. Storage temperature 15oC can extend the shelf life and maintain quality of magosteen fruit until 30 days after harvest (maturation stage 1 and 2), 15 days after harvest (maturation stage 3) and 20 days after harvest (maturation stage 4). The combination between the stage of maturity 1 and storage temperature 15oC is the best combination to maintain the quality of mangosteen fruit until 30 days after harvest.
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Judul: Physiological study of hardening and color changes of pericarp in relation to climacteric respiration and moisture content in mangosteen (Garcinia mangostana) after harvest
Abstrak: Mangosteen is a high economic value fruit in Indonesia. The problems encountered are the fruit pericarp quickly harden and the color immediately changed to dark purple-black, and sepals quickly turned into brown in color after harvest, so shelf life is short, especially at room temperature. This research aimed to study the process of change in hardness, pericarp and sepal color, and the sepal freshness of the mangosteen fruit and the factors that influence the physiology and biochemistry during storage. The research consisted of five experiments: (1) hardening physiology of mangosteen pericarp, (2) effect of exogenous ethylene and storage temperature on quality changes of mangosteen, (3) effects of 1-methylcyclopropene (1-mcp) and storage temperature on hardening of and color change of pericarp of mangosteen, (4) Effect of cytokinin and CoSO4 on physical quality of mangosteen during cool storage, and (5) Effect of coating material and cytokinin CPPU (N-(2-chloro-4-pyridyl)-N-phenylurea (Forchlorfenuron)) on the quality of mangosteen on cool storage. The results showed that the peak rate of ethylene production one day earlier than the respiration climacteric. The peak rate of ethylene production occurred on day 11 while the respiration climacteric peak occurred on day 12. Climacteric respiration will lead to biochemical changes in the mangosteen fruit pericarp, such an increase in protein content, increased activity of the enzyme phenylalanine ammonia lyase (PAL), cinnamyl alcohol dehydrogenase (CAD), and peroxidase (POD), and increasing the amount of lignin. Pericarp hardening occured due to water content decrease in the mangosteen and increased content of lignin. Fruit stored at a temperature of 15oC can last up to 28 days after treatment (DAT). Whereas fruit stored at room temperature only last up to 14 DAT. Mangosteen fruit stored at a temperature of 15oC had lower level of resistance and hardness. had a higher water content, lower weight loss, slower color change, and had a higher total soluble solids (TSS) and titratable acidity (TA). Exogenous ethylene treatment did not provide a marked influence on all the variables observed, which means that the mangosteen fruit wass less sensitive to exogenous ethylene treatment. 1-MCP treatment at various doses did not prolong the shelf life of the mangosteen fruit. This treatment is consistent in both room temperature and at a temperature of 15oC. 6% beeswax better reduce weight loss than other types of coating materials.
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Judul: Pendekatan Neodeskriptif pada Kasus Multikolinear dengan Menggunakan Regresi Sekuensial
Abstrak: Analisis regresi klasik menggunakan koefisian parsial untuk mengukur pengaruh beberapa peubah bebas (X) terhadap peubah tak bebas (Y).
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