Production of oligosaccharides from coconut meal by subcritical water treatment |
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Authors: | Pramote Khuwijitjaru Areewan Pokpong Khwanjai Klinchongkon Shuji Adachi |
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Affiliation: | 1. Department of Food Technology, Faculty of Engineering and Industrial Technology, Silpakorn University, , Nakhon Pathom, 73000 Thailand;2. Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, , Kyoto, 606‐8502 Japan |
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Abstract: | Coconut meal, a by‐product from coconut milk production, was hydrolysed via subcritical water treatment at various maximum temperatures in the range of 100–300 °C using a batch‐type vessel under nonisothermal conditions. The effect of the treatment temperature and time was evaluated using the severity factor (R0) as a parameter. The highest yield of mono‐ and oligosaccharides (28.3 g/100 g dry coconut meal) was obtained at lnR0 = 10.4 (maximum temperature of 250 °C within the treatment time of 14 min). At higher temperature, degradation of the saccharides was observed and a large quantity of 5‐hydroxymethyl‐2‐furaldehyde was detected. The hydrolysates contained mannose, glucose and manno‐oligosaccharides with various degrees of polymerisation. The yield and ratio of saccharide components were affected by variation of the ratio of coconut meal to water used in the subcritical water treatment. |
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Keywords: | Hydrolysis hydrothermal treatment mannan mannose oligomers severity factor superheated water |
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