琼脂糖酶产生菌Brevundimonas sp.发酵条件探讨
PDF下载 (450)赵蓉蓉,陈雪婷,桑卫国*,章宗铭.琼脂糖酶产生菌Brevundimonas sp.发酵条件探讨[J].宁波大学学报(理工版),2013,27(01):13-17.DOI:
.[J].Journal of Ningbo University(Natural Science & Engineering Edition),2013,27(01):13-17.DOI:
| 作者: | 赵蓉蓉, 陈雪婷, 桑卫国*, 章宗铭 |
| Author(s): | 赵蓉蓉, 陈雪婷, 桑卫国*, 章宗铭 |
| 关键词: | 琼脂糖酶文献码: A 琼脂经琼脂糖酶降解得到的产物琼脂寡糖具有抗癌、抗氧化、抗病毒等众多生理活性, 被广泛地运用于医药领域[1-3]. 琼脂是某些红藻细胞壁的重要组成成分, 因此, 琼脂糖酶在这些海藻的单细胞分离、酶解破壁制备原生质体等过程中具有重要的使用价值. 琼脂糖酶也可用于海藻多糖的结构研究, 用琼脂糖酶水解某些海藻的多糖, 测定其水解产物的结构, 进而推测多糖的结构, 是行之有效的方法[4]. 琼脂糖酶主要来源于海洋软体动物和海洋微生物. 据有关文献报道[5-7], 弧菌(Vibrio sp.)、交替假单胞菌属(Pseudoalteromonas sp.)、假单胞菌(Pseudomonas sp.)等中的某些菌种均能分解琼脂. 国内在琼脂微生物降解和琼脂糖酶解方面的研究报道仅局限于实验室研究, 尚无产业化应用[8-10]. |
| Keywords: | agarase; single factor; central composite; response surface |
| 分类号: | — |
| 文献标识码: | A |
| 摘要: | 为研究微生物发酵法获取高产量、高活性的琼脂糖酶, 以海洋细菌Brevundimonas sp.为实验菌株, 首先采用单因子分析法对发酵条件进行初步研究, 然后用部分析因试验设计方法选出2个显著因子热休克时间和发酵时间, 用中心组合设计方法进行试验设计及其发酵条件优化, 最后建立二次响应面回归模型. 从该模型可获得适宜发酵条件: 接种量1.5%, 热休克时间31s, 初始pH 7.5, 摇床转速120r·min-1, 发酵时间28.4h, 发酵温度23.5℃. 发酵条件优化后可产最大酶活502.2U·mL-1, 产酶活力较优化前提高了35%. |
| Abstract: | To obtain high yields and high activeness of agarase, marine bacteria strain Brevundimonas sp. agarase-producing is selected to study the optimal fermentation conditions. Using single factor analysis of the fermentation conditions for a preliminary study, fractional factorial design is used to select two significant factors of heat shock time and fermentation time, the central composite design is adopted in experimental design and optimization of the fermentation conditions. Then quadratic response surface regression model is established. The optimal fermentation condition is obtained from the following model: Inoculation of 1.5%; heat shock time 31s; initial pH 7.5; rotation speed 120r·min-1; fermentation time 28.4h; fermentation temperature 23.5℃. The highest activity of agarase is 502.2U·mL-1 under the optimal fermentation conditions, which is 1.35 times as high as that under the original conditions. This study is expected to provide some technical guidance for future application of the microbial strain in commercialization of the agarase. |
| 参考文献 /References: | (参考文献见PDF全文。) |
| 备注/Memo: | 收稿日期: 2013?04?21. 宁波大学学报(理工版)网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金(40776077); 农业部水产种质资源与养殖生态重点开放实验室科研项目(KFT2006.2). 第一作者: 赵蓉蓉(1988-), 女, 浙江金华人, 在读硕士研究生, 主要研究方向: 生物工程与技术. E-mail: 247309442@qq.com *通信作者: 桑卫国(1955http://journallg.nbu.edu.cn/ |