本文主要研究内容
作者周嫄(2019)在《以糖蜜为底物发酵生产韦兰胶的条件优化及其特性研究》一文中研究指出:韦兰胶(Welan Gum)是鞘氨醇单胞菌(Sphingomomassp.)发酵产生的一种酸性阴离子胞外多糖,具有优良的流变性、稳定性、增稠性和悬浮性,这使得它在食品、水泥和石油工业中备受青睐。然而,目前韦兰胶发酵生产还存在着传氧困难、成本高的问题。甘蔗糖蜜作为广西特色生物质资源,不仅价格低廉、营养丰富而且已在发酵工业的实际生产中得到了应用。因此,若能够利用甘蔗糖蜜发酵生产韦兰胶,实现生物质资源的高值化利用,将为韦兰胶的高效低成本生产提供科学依据。本文以Sphingomonas paucimobili FM01为出发菌株,以高效生产韦兰胶为目标,开展糖蜜预处理、培养条件优化、结构表征、流变性质等相关研究。主要研究结果如下:1.分别考察了六种糖蜜预处理方法对韦兰胶发酵的影响。其中,对糖蜜胶体、灰分、重金属元素清除效果最好的为磷酸加絮凝剂助清法,其次为活性炭结合硅藻土法。利用磷酸加絮凝剂助清法处理糖蜜发酵生产韦兰胶相较未处理糖蜜产量提高了38%。2.考察了培养基成分和培养条件对韦兰胶发酵的影响:(1)单因素优化后得到最佳营养条件:糖蜜糖浓度60 g·L-1,牛肉膏6g·L-1,磷酸二氢钾3 g·L-1、硫酸镁0.5 g·L-1,氯化钠1 g·L-1。(2)单因素实验得到最佳培养条件:摇床250r/min;装液量75mL/500mL;培养温度30℃。以此上述发酵条件进行72 h发酵验证,得到韦兰胶产量为26.31 g·L-1,比优化前提高了64%。3.(1)考察了四种氧载体以及H2O2对糖蜜韦兰胶发酵的影响,当H2O2浓度为15mmol/L,添加时间为48h时获得最大韦兰胶产量31.22g·L-1。(2)考察了烟酸、柠檬酸、尿嘧啶对糖蜜韦兰胶发酵的影响,当烟酸添加量为4 mg· L-1时,相比对照组提高了4.47%,达到了33.93 g·L-1;而尿嘧啶和柠檬酸均对韦兰胶合成有抑制作用。在最优条件进行72 h发酵验证,得到韦兰胶产量为37.65 g·L-1。4.(1)对糖蜜韦兰胶和蔗糖韦兰胶进行结构表征,结果表明:两种韦兰胶分子键型一致;蔗糖韦兰胶四种单糖摩尔比为甘露糖:鼠李糖:葡萄糖醛酸:葡萄糖=1:33.65:3.24:21.09;糖蜜韦兰胶七种单糖摩尔比为甘露糖:鼠李糖:葡萄糖醛酸:葡萄糖:半乳糖:木糖:阿拉伯糖=1:11.17:2.83:6.88:2.17:1.04:2.27;扫描电镜显示蔗糖韦兰胶与糖蜜韦兰胶由粗长片状尾部撕裂成若干个细丝状,形成细长丝状、紧密聚集的空间结构。(2)对两种韦兰胶溶液进行流变性质研究。通过振幅扫描确定应变为10%;在15 Hz内两种韦兰胶溶液的存储模量大于损耗模量,结构稳定;在升温过程中两种韦兰胶溶液存储模量和损耗模量降低;在2%-10%氯化钠、氯化钾的条件下两种韦兰胶溶液流变性质稳定;pH 6-9范围内对两种韦兰胶溶液的剪切黏度影响不大,但在强酸强碱环境下,两种韦兰胶溶液的剪切黏度略有下降。
Abstract
wei lan jiao (Welan Gum)shi qiao an chun chan bao jun (Sphingomomassp.)fa jiao chan sheng de yi chong suan xing yin li zi bao wai duo tang ,ju you you liang de liu bian xing 、wen ding xing 、zeng chou xing he xuan fu xing ,zhe shi de ta zai shi pin 、shui ni he dan you gong ye zhong bei shou qing lai 。ran er ,mu qian wei lan jiao fa jiao sheng chan hai cun zai zhao chuan yang kun nan 、cheng ben gao de wen ti 。gan zhe tang mi zuo wei an xi te se sheng wu zhi zi yuan ,bu jin jia ge di lian 、ying yang feng fu er ju yi zai fa jiao gong ye de shi ji sheng chan zhong de dao le ying yong 。yin ci ,re neng gou li yong gan zhe tang mi fa jiao sheng chan wei lan jiao ,shi xian sheng wu zhi zi yuan de gao zhi hua li yong ,jiang wei wei lan jiao de gao xiao di cheng ben sheng chan di gong ke xue yi ju 。ben wen yi Sphingomonas paucimobili FM01wei chu fa jun zhu ,yi gao xiao sheng chan wei lan jiao wei mu biao ,kai zhan tang mi yu chu li 、pei yang tiao jian you hua 、jie gou biao zheng 、liu bian xing zhi deng xiang guan yan jiu 。zhu yao yan jiu jie guo ru xia :1.fen bie kao cha le liu chong tang mi yu chu li fang fa dui wei lan jiao fa jiao de ying xiang 。ji zhong ,dui tang mi jiao ti 、hui fen 、chong jin shu yuan su qing chu xiao guo zui hao de wei lin suan jia xu ning ji zhu qing fa ,ji ci wei huo xing tan jie ge gui zao tu fa 。li yong lin suan jia xu ning ji zhu qing fa chu li tang mi fa jiao sheng chan wei lan jiao xiang jiao wei chu li tang mi chan liang di gao le 38%。2.kao cha le pei yang ji cheng fen he pei yang tiao jian dui wei lan jiao fa jiao de ying xiang :(1)chan yin su you hua hou de dao zui jia ying yang tiao jian :tang mi tang nong du 60 g·L-1,niu rou gao 6g·L-1,lin suan er qing jia 3 g·L-1、liu suan mei 0.5 g·L-1,lv hua na 1 g·L-1。(2)chan yin su shi yan de dao zui jia pei yang tiao jian :yao chuang 250r/min;zhuang ye liang 75mL/500mL;pei yang wen du 30℃。yi ci shang shu fa jiao tiao jian jin hang 72 hfa jiao yan zheng ,de dao wei lan jiao chan liang wei 26.31 g·L-1,bi you hua qian di gao le 64%。3.(1)kao cha le si chong yang zai ti yi ji H2O2dui tang mi wei lan jiao fa jiao de ying xiang ,dang H2O2nong du wei 15mmol/L,tian jia shi jian wei 48hshi huo de zui da wei lan jiao chan liang 31.22g·L-1。(2)kao cha le yan suan 、ning meng suan 、niao mi ding dui tang mi wei lan jiao fa jiao de ying xiang ,dang yan suan tian jia liang wei 4 mg· L-1shi ,xiang bi dui zhao zu di gao le 4.47%,da dao le 33.93 g·L-1;er niao mi ding he ning meng suan jun dui wei lan jiao ge cheng you yi zhi zuo yong 。zai zui you tiao jian jin hang 72 hfa jiao yan zheng ,de dao wei lan jiao chan liang wei 37.65 g·L-1。4.(1)dui tang mi wei lan jiao he zhe tang wei lan jiao jin hang jie gou biao zheng ,jie guo biao ming :liang chong wei lan jiao fen zi jian xing yi zhi ;zhe tang wei lan jiao si chong chan tang ma er bi wei gan lou tang :shu li tang :pu tao tang quan suan :pu tao tang =1:33.65:3.24:21.09;tang mi wei lan jiao qi chong chan tang ma er bi wei gan lou tang :shu li tang :pu tao tang quan suan :pu tao tang :ban ru tang :mu tang :a la bai tang =1:11.17:2.83:6.88:2.17:1.04:2.27;sao miao dian jing xian shi zhe tang wei lan jiao yu tang mi wei lan jiao you cu chang pian zhuang wei bu si lie cheng re gan ge xi si zhuang ,xing cheng xi chang si zhuang 、jin mi ju ji de kong jian jie gou 。(2)dui liang chong wei lan jiao rong ye jin hang liu bian xing zhi yan jiu 。tong guo zhen fu sao miao que ding ying bian wei 10%;zai 15 Hznei liang chong wei lan jiao rong ye de cun chu mo liang da yu sun hao mo liang ,jie gou wen ding ;zai sheng wen guo cheng zhong liang chong wei lan jiao rong ye cun chu mo liang he sun hao mo liang jiang di ;zai 2%-10%lv hua na 、lv hua jia de tiao jian xia liang chong wei lan jiao rong ye liu bian xing zhi wen ding ;pH 6-9fan wei nei dui liang chong wei lan jiao rong ye de jian qie nian du ying xiang bu da ,dan zai jiang suan jiang jian huan jing xia ,liang chong wei lan jiao rong ye de jian qie nian du lve you xia jiang 。
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论文详细介绍
论文作者分别是来自广西大学的周嫄,发表于刊物广西大学2019-10-14论文,是一篇关于韦兰胶论文,糖蜜论文,鞘氨醇单胞菌论文,发酵条件优化论文,广西大学2019-10-14论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自广西大学2019-10-14论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:韦兰胶论文; 糖蜜论文; 鞘氨醇单胞菌论文; 发酵条件优化论文; 广西大学2019-10-14论文;