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2001 - 20053
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Subject: Processing and Food Engineering × Author: KAU × End date: 2009 × Start date: 2000 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Scope of banana and plantain pseudostem sheaths for fibre extraction and its utilisation
    (Department of Processing Technology, College of Horticulture,Vellanikkara, 2005) Gopinath, N; KAU; Raju, V K
    Studies were conducted. at College of Horticulture, Department of Processing Technology, Kerala Agricultural University, Vellanikkara from February 2003 to August 2004 to asses the "Scope of banana and plantain pseudo stem sheaths for fibre extraction and its utilization". The fibre extracted under hand method of extraction recorded less wet weight (10.53g), less dry weight (4.24g) and percentage of recovery (0.43per cent). In mechanical extraction comparable values with wet weight (11.02g), dry weight (4.69g), percentage recovery (0.51 per cent) were obtained. The visual quality of fibre was rated as maximum under hand extraction. In retting method of fibre extraction, among different retting agents sodium hydroxide (two per cent) produced maximum wet fibre (12.22g) and dry fibre (6.50g) followed by hydrogen peroxide (two per cent). In regard to wet fibre yield, varieties Red Banana and Palayankodan yielded maximum fibre under both methods of extraction (16.5g and 15.8g and 25.7g and 14.5g respectively). Dry fibre yield was also maximum (6.3g and 13.0g respectively) under both the methods of extraction in Red Banana. The recovery percentage results revealed that Nendran, Red Banana and Palayankodan were showing higher percentage due to increase in sheath weight. Length of fibre was maximum (94.2cm) in Red banana. In visual quality assessment Palayankodan and Poovan (Rasthali) varieties recorded the superiour quality fibres. Palayankodan exhibited maximum value .for fibre wall thickness (4.4J..lm), fibre thickness (47.7 um) and lumen width (38.P9J..lm). Among the varieties, Robusta recorded the maxunum tensile strength (76.8), which was 25 per cent more Clan Nendran, 32 per cent more than I PaJayankodan, 29 per cent more than Red Banana and 10 per cent more than Poovan (Rasthali). The variety Red Banma recorded the maximum elongation (6.38 per cent) followed by Nendran (5.21per cent) and minimum (1.56 per cent) was recorded by Robusta. The density of fibre was directly proportional to elongation and inversely proportional to tensile strength. The density was maximum (2.05g/cm3) for Nendran and minimum (1.78 g/cm ') for Palayankodan. Irrespective of varieties, fibre stored in HDPE cover without vacuum recorded the maximum storage stability for tensile strength and minimum of elongation and density in Robusta. Irrespective of storage method tensile strength, elongation and density of fibre varied significantly over a period of five months in respects of varieties viz., Robusta, Palayankodan, Poovan, Red Banana and Nendran. The stability of tensile strength, elongation and density were maximum during first and second month. The water absorbability in banana fibre plait was maximum ranging from 169.62 per cent to 168.25 per cent, whereas in case of rope the water absorbability was lesser than the plait ranging only from 133.97 per cent to 133.10 per cent. Tensile strength was maximum n the plait of variety Robusta (675.77 cN/tex) and elongation was observed to 1 -e maximum in Kanchikela (23.09 per cent).
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    ThesisItemOpen Access
    Standardisation of techniques for cashew apple wine production and development of wine based products
    (Department of Processing Technology, College of Horticulture,Vellanikkara, 2001) Maria Glenda Rose, Carvalho; KAU; Raju, V K
    The present study on the 'Standardization of techniques for cashew apple wine production and development of wine based products' was conducted in the Department of Processing Technology, College of Horticulture, Vellanikkara during 1999-2001. The evaluation of the efficiency of three strains of wine yeast in the preparation of cashew apple wine revealed that strain MICC 180 was superior to the other strains. It produced wine of high alcohol content and low acidity. Jaggery proved to be a better ameliorant than cane sugar in case of all three strains, as the musts resulted in wines of high alcohol and high TSS and total sugar content. Gelatin (1%) was found to be superior to the other clarifying agents, viz., PVP, pectin and rice gruel, as it produced wine of good quality with regard to all the sensory attributes. Rice gruel and PVP (0.4%) also served as good clarifying agents, but due the high cost of PVP, its use may not be economical. The cost of gelatin being considerably low and rice gruel, available in all house-holds of Kerala in plenty, these two could be used for clarification of cashew apple juice to produce good quality wine. The varietal evaluation of cashew apples for wine making revealed that the varieties, Madakkathara-l and Dhana were superior to the other varieties studied. Wine from Madakkathara-I had high alcohol content, good flavour and overall acceptability, while that from Dhana recorded low astringency and possessed a favourable sugar-acid blend. Wines kept for a storage period of six months showed a general improvement in its quality and acceptability over the fresh wines. Plain as well as coloured glass bottles and steel containers were found to be superior to pet jars and china clay jar, for storage of wines. Bamboo containers and clay pots, due to their highly porous nature were not suited for wine storage. Storage of wines in dark, rather than open or refrigerated condition was found superior in terms of quality and acceptablity. Cashew apple wine blended with wines from that of grape, banana and pineapple was found to result in products of better acceptability. Similarly, cashew apple wine mixed with fresh fruit juices like those of orange, pineapple, tomato, grape and cashew apple as well as tender coconut water produced wine coolers of high consumer acceptance. Hence, preparation of these two products from cashew apple wine can be recommended to increase the consumption of the wine. Besides, wine coolers due to its constituents also possess several nutritional as well as medicinal properties and can be popularised as a health drink. These wine based products, viz., blended, wines and wine coolers can bring additional income to farmers through utilization of the otherwise wasted cashew apple.
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    ThesisItemOpen Access
    Value addition in banana (Musa spp.)
    (Department of Processing technology,College of Agriculture, Vellayani, 2005) Jasmin L, Rasheed; KAU; Philipose Joshua
    The present investigation entitled 'Value addition in banana (Musa spp.)' was carried out to explore the possibility of value addition in banana through development of different food products and to evaluate the suitability of three cultivars viz., Nendran, Red Banana and Palayankodan. Five products namely squash, RTS, puree, fig and fruit bar had been prepared and evaluated. The biochemical, organoleptic and microbiological qualities were observed at the time of preparation as well as during storage. TSS of all the four products were found to be increasing except in puree. In puree TSS decreased with increase in storage period. Acidity of the products increased with increase in storage period except in the case of fig. The total sugars, reducing sugars and non reducing sugars increased during storage in squash, puree, fig and fruit bar while in RTS only reducing sugars were increased during storage. Moisture content in products like puree and fig were found increasing and that in fruit bar was found decreasing during storage.' Other biochemical parameters like vitamin C and total carotenoids were always decreased during storage for all the five products. In the case of carotenoid content there was marked difference in the products made from cultivar Nendran with those of other cultivars. Nendran products had very high total carotenoids compared to the products of other two cultivars. Regarding the organoleptic quality, Red Banana' products were more acceptable with regard to taste and flavour in most of the products. The exceptions were puree and RTS which were prepared with Nendran cultivar. Nendran products maintained an appreciable colour for the products especially in puree. The organoleptic qualities decreased during storage. Bacterial and fungal colonies were found during the later stages of storage. Only fruit bar remained intact for the full term of six months of storage. The lowest shelflife was for R TS. From the above study it is concluded that banana can be utilized to make many value added products like squash, RTS, puree, fig and fruit bar'. The suitability of the cultivar for making different products was also found. Red Banana found to be highly acceptable for most of the products prepared. With regard to taste and flavour it stands first but shelf life was less compared to Nendran. Nendran was found very much suitable for puree. It had a very attractive colour. Nendran stands next to Red Banana in case of taste and flavour. But was highest in nutritive quality. Palayankodan was not found good for these products with regard to taste. Both Red Banana and Palayankodan products had shorter shelf life.