Characterization of a thermophilic and halotolerant strain <i>Geobacillus</i> sp. XDF-4

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Characterization of a thermophilic and halotolerant strain Geobacillus sp. XDF-4

更新时间：2025-12-10

- Characterization of a thermophilic and halotolerant strain Geobacillus sp. XDF-4
- CIESC Journal Issue 11, (2010)
- 作者机构：
  
  1. 中国科学院渗流流体力学研究所
  2. 中国石油勘探开发研究院廊坊分院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 November 2010，
  
  Published：05 November 2010
- 稿件说明：
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夏文杰. Characterization of a thermophilic and halotolerant strain Geobacillus sp. XDF-4[J]. CIESC Journal, 2010, (11).
DOI：

夏文杰. Characterization of a thermophilic and halotolerant strain Geobacillus sp. XDF-4[J]. CIESC Journal, 2010, (11). DOI：

摘要

Abstract

A strain XDF-4 was obtained by isolation from stratum water of oil recovery in Longhupao block of Daqing oil field

and identified as Geobacillus sp. by morphological observation

physiological and biochemical test and 16SrDNA gene sequence analysis. It grows well at 45—75℃

pH 6. 5—9.0 and salt concentration 0—10%

and the optimum conditions was 65℃ and salt concentration 3%. It was found that XDF-4 could utilize crude oil as sole carbon source to synthesize biosurfactant at high temperature and salinity

which could lead to decrease in surface tension of the culture medium from 68.59 mN·m-1 to 29.58 mN·m-1 after 7d zymolysis. The results from thin-layer chromatography and chromogenic reaction showed that the biosurfactant produced by XDF-4 involves three main compounds: glycosides 50.26%（mass）

lipids 28. 47%（mass） and protein 15. 35%（

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Characterization of a thermophilic and halotolerant strain Geobacillus sp. XDF-4

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