水蜜桃 asked in 社會與文化語言 · 1 decade ago

求救~一篇文章看不懂.英文強的幫我翻譯一下...(20點

一篇文章看不懂.誰來幫幫我

An optimised procedure is reported for extraction of pectin from pumpkin pulp, using an enzyme preparation from Aspergillus awamori. In contrast to pumpkin pectin obtained previously by digestion with cell-free culture medium from Bacillus polymyxa, the material prepared in the present work forms gels with 60 wt% sucrose at pH 3, although the yield is somewhat lower (14% in comparison with 22%). The main action of the enzyme complex from A. awamori is to degrade cellulose and other insoluble constituents of the plant tissue, but it also has some pectinesterase activity, which could allow degree of esterification (DE) to be manipulated by varying digestion time. The time used in this investigation (3 h) gave a DE of 53%; reduction in DE at longer times should yield pectin with a higher content of unesterified galacturonate residues, capable of binding lead and other heavy-metal cations. Some possible medicinal and food uses are suggested.

Introduction

The natural polysaccharide pectin (a basic building material for cell walls of higher plants)possesses a wide spectrum of functional properties.In combination with water and some other substances,it can act as a thickener,gelling agent,stabilizer,emulsi .er,cation-binding agent,etc.(Bottger,1990).One substance having so many separate properties of technological interest makes pectin a biopolymer especially valuable for medicine and food production.Pectin is not only an effective or even necessary additive to form the structure of food products but also has medicinal bene .ts which include lowering the cholesterol level in blood,removing heavy metal ions from the body,stabilizing blood pressure,and restoring intestinal functions (Voragen,Pilnik,Thibault,Axelos,&Renart,1995).

Update:

The world consumption of pectin constantly grows and has already exceeded 20,000 tons a year.Dried lemon or orange peel and apple pomace are the main raw materials for its production.

Update 2:

And although the potential stock of these raw materials enables the main pectin producers (USA,Germany,Denmark)to plan an annual increase of pectin production of approximately 3.8%(Phillips,2000),searching for new pectin-containing raw materials is an important task of science and industry.

Update 3:

Another urgent task is to improve pectin extraction techniques from raw material.The current technology is based on acidic hydrolysis and has at least two demerits:

Update 4:

acidic extraction does not allow pectin to be extracted fully with no damage to its structure and it does not meet environmental safety due to acid usage.

Update 5:

An enzyme-hydrolytic technology seems environmentally safe and more effective in terms of pectin yield.

Update 6:

Analysis of the scientic and patent literature shows that a number of research centres have been conducting studies to develop a biotechnological method of pectin extraction but these works are of exploratory nature only,

Update 7:

they do not yet involve a wide range of researchers,and their results are far from industrial application.However,the achievements of biotechnology encourage optimism,including the problem under consideration.

Update 8:

翻出來我還是看不太懂意思...因為翻出來的文法順序都怪怪的

Update 9:

JACK~~超感謝你...

補充的那幾段也可以幫我翻譯一下嗎??

2 Answers

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  • 1 decade ago
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    從南瓜提練果膠的最佳程序是使用Aspergillus awamori(一種曲黴菌)酵素調製。對照先前使用多黏芽孢桿菌為培養基以無細胞培養消化獲得的南瓜果膠,現在準備的材料可形成pH 3重量百分比為60 wt%的蔗糖膠,雖然產量比較低(14%對比22%).。從A. awamori合成的酵素主要作用方式為降解細胞膜或其它不溶的植物組職,同時有果膠酯酶作用,可藉由改變消化時間操控酯化程度。此研究的時間(3小時)可使酯化53%,更長時間的減少酯化應可產生較高;果膠甲酯酶抑製劑殘餘物含量的果膠,具有膠合鉛及其它重金屬陽離子的能力。

    簡介

    自然的多醣類果膠(較高植物的細胞壁基本組成物)顯性遺傳了廣泛的功能特性。某些物質與水的混合物可作用如勾芡粉、膠化劑、安定劑、乳化劑、離子接合劑等(Bottger,1990)。一個物質具有那麼多不同的技術影響的特性,使得果膠成為生物高聚物,尤其是對醫藥及食物製品特別有價值。果膠不僅是形成食物製品結構的作用劑甚而是必須的添加物,同時有諸如降低血液中膽固醇含量、排除體內重金屬離子、穩定血壓及回復腸功能的藥效好處(Voragen,Pilnik,Thibault,Axelos,&Renart,1995).

    2008-10-18 17:55:54 補充:

    果膠的世界消耗量穩定成長並已超過一年2萬噸。乾檸檬或去皮柳橙及榨汁後的蘋果渣是這些果膠產品最主要的原料。

    2008-10-18 17:56:11 補充:

    2008-10-05 16:43:15 補充

    雖然這些原料的潛在存量可供主要生產地(美國、德國、丹麥)以3.8%的年成長率計劃增加果膠產量,研究新的含果膠原料對科學及產業仍是一項重要的課題。

    2008-10-18 17:56:26 補充:

    2008-10-05 16:44:22 補充

    另一項緊急的任務是從改善從原料中萃取果膠的技術。現有的技術基礎是使用酸性水解,這有兩個缺點:

    2008-10-05 16:44:40 補充

    酸性萃取使果膠結構無法不受傷害的完全萃取,且因使用酸性劑對環境也有危害。

    2008-10-18 17:56:34 補充:

    2008-10-05 16:46:24 補充

    酵素水解似乎對環境較安全且果膠產量更有效率。

    2008-10-05 16:46:35 補充

    科學分析及公開文獻皆顯示一些研究已帶領著果膠萃取方法往生物科技的方法發展,但這些工作僅是研究探討,

    2008-10-05 16:47:04 補充

    並沒有廣泛的納入各領域研究人員,且他們研究的結果仍不符產業應用。然而,包括正在思考解決的問題,生物科技的成就仍令人樂觀。

    2008-10-18 17:57:15 補充:

    更正:

    2008-10-05 16:44:22 補充

    另一項緊急的任務是改善從原料中萃取果膠的技術。現有的技術基礎是使用酸性水解,這有兩個缺點:

    Source(s): 自己, 自己, 自己, 自己, 自己, 自己
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  • Anonymous
    1 decade ago

    這個你到雅虎字典的段落翻譯就有了,如果你還是不會可以在找我,

    http://tw.babelfish.yahoo.com/translate_txt?ei=UTF...

    他一次只能翻150個子!所以你要分開來翻譯,如果很麻煩請見諒!

    Source(s): 自己的經驗
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