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Theses

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2011 - 20122
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Subject: Post Harvest Technology × Author: KAU × End date: 2015 × Start date: 2011 × Type: Thesis ×
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    ThesisItemOpen Access
    Development and evaluation of a seed extractor for ash gourd and cucumber
    (Department of Post harvest technology and agricultural processing,Kelappaji College of Agricultural Engineering and Technology, Tavanur, 2011) Aneesh, Mohan; KAU; Santhi, Mary Mathew
    A seed extractor was developed for ash gourd and cucumber. The important part of the machine is the extraction tool whose diameter can be varied (52 -160 mm) according to the placental diameter of the fruit and it can be maintained at that diameter for the required time. The principle of operation is to penetrate the rotating tool with handle, into the placental region after adjusting its diameter which helps in scraping out the seeds along with the pulp from the centre and surrounding mesocarp portion. The experiment was conducted as a completely randomized design with three factors. Two blade shapes (round edged and pointed edged), three blade thicknesses (1, 2 and 3 mm) and four rotational speeds (50, 80, 120 and 160 rpm) were chosen. For each experiment, the number of replications were three. Before loading the vegetables to the holder for seed extraction the top and bottom ends which do not contain the seeds were cut and removed for easy penetration of the tool. By adjusting the blade diameter to required size, the rotating tool is lowered through the central portion of the vegetable and it scraps out the seeds from the surrounding mesocarp. The seeds are discharged into the chute. The seed extraction of ash gourd was achieved by a mean time of 10.6 s/kg and that of cucumber with 16.6 s/kg. The seed extraction efficiencies of both these vegetables were in the range of 99 to 100%. The germination rates were 95% for ash gourd seeds and 96% for cucumber seeds. The capacity of the extractor for ash gourd is 350 kg/h and that of cucumber is 219 kg/h. The average energy consumption at loaded condition for seed extraction of ash gourd is 0.105 kWh and for cucumber is 0.102 kWh. The cost of seed extraction per kilogram for ash gourd is ` 0.15/- and for cucumber is ` 0.24/-. The cost of seed production per kilogram for ash gourd is ` 10.3 /- and for cucumber is ` 3.0/-.
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    ThesisItemOpen Access
    Development of process protocol for garcinia cambogia power
    (Department of postharvest technology and agricultural processing, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 2012) Sunitha, C P; KAU; Santhi, Mary Mathew
    The major problem faced by the farmers regarding the processing of Garcinia cambogia is difficulty in drying of this fruit as the harvesting period coincides with the southwest monsoon also if not processed quickly fungal infection may takes place. And the currently adopted sun drying method takes long time and affects the quality of the product. Drying of Garcinia cambogia juice into powdered particles gives a considerable reduction in volume, easy to use and is an effective method for prolonging the shelf life. Therefore, a research study was conducted to develop a process protocol for Garcinia cambogia powder from the fresh fruit itself. Powder samples were obtained by drying the Garcinia cambogia juice using spray dryer (atomizer speeds 17000rpm and 22000rpm, inlet air temperature 175 and 180oC and feed flow rates 5, 5,5 and 6 l/h), tray drying (at 60, 70 and 80oC) and vacuum tray drying (40, 45 and 50oC) techniques. Garcinia cambogia juice at 120brix was used to prepare the fruit juice powder. In order to reduce the stickiness and also to increase the yield of the powder, maltodextrin (15% based on sensory evaluation, moisture content and solubility) the most widely used additive was used. The method of drying parameter was optimized on the basis of quality of the powder such as moisture content, total solids, colour, acid value, pH, bulk density solubility index and wettability. The quality of the powder obtained using spray dryer at an inlet air temperature of 1800 C, speed of the atomizer 22000 rpm and feed rate as 5.5 l/h (with an average particle size (8 μm), bulk density (0.412 3 g/cm ), moisture content (3.5939%wb) and total solids (96.407) was superior to those obtained by vacuum tray dried and tray dried product. So spray drying was selected as the best method for the production of Garcinia cambogia powder which have a storability of above 7 months with good reconstitution properties (wetting time, 80 S) and solubility index ,<0.1mm ).