Study of change in shiitake of nucleotide-relative compounds at heat process

碩士 === 國立屏東科技大學 === 食品科學系所 === 96 ===    Shiitake have long term cultivated history and commercialized production; it’s one kind of among edible mushrooms. When shiitake dried, their enzymes could transform from contain sulfur-compound to the special flavor molecule, lenthionine, took the fancy of t...

Full description

Bibliographic Details
Main Authors: Yu-Liang Yang, 楊庾量
Other Authors: Wen-Kuei Chiu
Format: Others
Language:zh-TW
Published: 2008
Online Access:http://ndltd.ncl.edu.tw/handle/01877557138765546426
id ndltd-TW-096NPUS5253003
record_format oai_dc
spelling ndltd-TW-096NPUS52530032016-12-22T04:12:07Z http://ndltd.ncl.edu.tw/handle/01877557138765546426 Study of change in shiitake of nucleotide-relative compounds at heat process 香菇在加熱過程中核苷酸相關物變化情形之研究 Yu-Liang Yang 楊庾量 碩士 國立屏東科技大學 食品科學系所 96    Shiitake have long term cultivated history and commercialized production; it’s one kind of among edible mushrooms. When shiitake dried, their enzymes could transform from contain sulfur-compound to the special flavor molecule, lenthionine, took the fancy of the consumers. Shiitake also have a high nutrient-values food with the characteristic properties, like as rich protein and polysaccharides, low-calories, low-fat, so was called ‘vegetarian beefsteak’. Now recently healthy living conception was popular, pay much attention to shiitake’s affectiviness than before. Beside that, the 5’-nucleotides, free amino acids, saccharides and their derivates were combined with different food materials, could raise abundant mouth-tastes, and played the important effects. For the purpose of this study, the fresh or cool air-dried shiitakes were used as the experimental materials and study on heat process treatment, the change of 5’-nucleotides of shiitake were investigated. When soaked in water at 45 minitesw of fresh and dried shiitake, during fresh treatment to 40℃, the study found the percentage of water absorption maximum at 19.8% and 14.0%, respectively. RNA content of fresh shiitake is more than dried and according to the temperature increasing to reduced by heat treatment, from 128.6 to 50.4 μmol/g and 75.2 to 57.8 μmol/g, respectively. The temperature of heat treatment is over 40℃ and 50℃, respectively. The nuclease activities of dried shiitake and fresh shiitake were rapidly. The enzyme of phosphatase activities were declined over 50℃, either in fresh or dried shiitake. However, these two kind enzymes are not stable over 70℃. The fresh shiitake was soaked in water, the content of 5’-nucleotide in soaked liquid was found fresh shiitake less than dried, in contrast, in tissue, the 5’-nucleotide of fresh shiitake was more than dried. The content of 5’-nucleotide in the soaked liquid was increased according to the heat treatment temperature increased compared with dried shiitake liquids was above 1.5 times of fresh shiitake liquids. As the results of study, it could preliminary understand; even if the same food material, thought some kind process as dried treatment, that will decide the final fate of their applied or after used in different cooking to present their different feeling. Key words: Shiitake (Lentinus edodes), 5’-nucleotides, temperature, heat Wen-Kuei Chiu 邱文貴 2008 學位論文 ; thesis 67 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立屏東科技大學 === 食品科學系所 === 96 ===    Shiitake have long term cultivated history and commercialized production; it’s one kind of among edible mushrooms. When shiitake dried, their enzymes could transform from contain sulfur-compound to the special flavor molecule, lenthionine, took the fancy of the consumers. Shiitake also have a high nutrient-values food with the characteristic properties, like as rich protein and polysaccharides, low-calories, low-fat, so was called ‘vegetarian beefsteak’. Now recently healthy living conception was popular, pay much attention to shiitake’s affectiviness than before. Beside that, the 5’-nucleotides, free amino acids, saccharides and their derivates were combined with different food materials, could raise abundant mouth-tastes, and played the important effects. For the purpose of this study, the fresh or cool air-dried shiitakes were used as the experimental materials and study on heat process treatment, the change of 5’-nucleotides of shiitake were investigated. When soaked in water at 45 minitesw of fresh and dried shiitake, during fresh treatment to 40℃, the study found the percentage of water absorption maximum at 19.8% and 14.0%, respectively. RNA content of fresh shiitake is more than dried and according to the temperature increasing to reduced by heat treatment, from 128.6 to 50.4 μmol/g and 75.2 to 57.8 μmol/g, respectively. The temperature of heat treatment is over 40℃ and 50℃, respectively. The nuclease activities of dried shiitake and fresh shiitake were rapidly. The enzyme of phosphatase activities were declined over 50℃, either in fresh or dried shiitake. However, these two kind enzymes are not stable over 70℃. The fresh shiitake was soaked in water, the content of 5’-nucleotide in soaked liquid was found fresh shiitake less than dried, in contrast, in tissue, the 5’-nucleotide of fresh shiitake was more than dried. The content of 5’-nucleotide in the soaked liquid was increased according to the heat treatment temperature increased compared with dried shiitake liquids was above 1.5 times of fresh shiitake liquids. As the results of study, it could preliminary understand; even if the same food material, thought some kind process as dried treatment, that will decide the final fate of their applied or after used in different cooking to present their different feeling. Key words: Shiitake (Lentinus edodes), 5’-nucleotides, temperature, heat
author2 Wen-Kuei Chiu
author_facet Wen-Kuei Chiu
Yu-Liang Yang
楊庾量
author Yu-Liang Yang
楊庾量
spellingShingle Yu-Liang Yang
楊庾量
Study of change in shiitake of nucleotide-relative compounds at heat process
author_sort Yu-Liang Yang
title Study of change in shiitake of nucleotide-relative compounds at heat process
title_short Study of change in shiitake of nucleotide-relative compounds at heat process
title_full Study of change in shiitake of nucleotide-relative compounds at heat process
title_fullStr Study of change in shiitake of nucleotide-relative compounds at heat process
title_full_unstemmed Study of change in shiitake of nucleotide-relative compounds at heat process
title_sort study of change in shiitake of nucleotide-relative compounds at heat process
publishDate 2008
url http://ndltd.ncl.edu.tw/handle/01877557138765546426
work_keys_str_mv AT yuliangyang studyofchangeinshiitakeofnucleotiderelativecompoundsatheatprocess
AT yángyǔliàng studyofchangeinshiitakeofnucleotiderelativecompoundsatheatprocess
AT yuliangyang xiānggūzàijiārèguòchéngzhōnghégānsuānxiāngguānwùbiànhuàqíngxíngzhīyánjiū
AT yángyǔliàng xiānggūzàijiārèguòchéngzhōnghégānsuānxiāngguānwùbiànhuàqíngxíngzhīyánjiū
_version_ 1718403222911057920