期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
耐硒芽孢杆菌的筛选及其亚硒酸盐还原机制的探究 被引量:4
1
作者 杨锐 余雍和 +1 位作者 程水源 王璋倩 《食品工业科技》 CAS 北大核心 2021年第22期105-111,共7页
微生物能将氧化形态的有毒硒转化为无毒的纳米硒(SeNPs),这种“绿色合成”方式在功能性产品开发、环境治理和医疗等方面的应用潜力巨大。本文从长期施加硒肥的大豆种植基地中筛选出菌株F4,对该菌株进行耐硒能力测定、鉴定分类、生长还... 微生物能将氧化形态的有毒硒转化为无毒的纳米硒(SeNPs),这种“绿色合成”方式在功能性产品开发、环境治理和医疗等方面的应用潜力巨大。本文从长期施加硒肥的大豆种植基地中筛选出菌株F4,对该菌株进行耐硒能力测定、鉴定分类、生长还原动力学分析,并通过体外还原试验初步探究亚硒酸钠的还原机理。结果表明:该菌属于高山芽孢杆菌(Bacillus altitudinis),在浓度为50 mmoL/L亚硒酸钠平板中,菌株菌落存活率为37.08%,对亚硒酸钠的耐受能力可高达250 mmoL/L。在含硒培养基中的还原过程发现,菌株在前期6~14 h先生长然后在对数期中后期14~48 h对亚硒酸钠进行还原,并在稳定时期产生红色沉淀。体外还原定位试验反应体系在33℃下孵育24 h后,在培养上清和胞外多糖中观察到反应活性,添加还原型辅酶ⅠNADH下细胞质有略微变化。该芽孢杆菌可作为生产红色纳米硒的菌株,可为硒的生物转化提供参考。 展开更多
关键词 高山芽孢杆菌 纳米硒 (SeNPs) 亚硒酸钠还原 还原定位
下载PDF
Synthesis of the dl-ξ-Thiotocopherol: Newest Derivative of the dl-a-Tocopherol
2
作者 Tuncer Mutlu Ibrahim Erol +1 位作者 Nevin Mutlu Levent Ozcan 《Journal of Chemistry and Chemical Engineering》 2012年第1期90-95,共6页
Tocopherol is the most active vitamin and natural antioxidant existing in the nature known as vitamin E. Lacking of this vitamin makes drastic exchanges on the health of the living organisms. Their active chemical for... Tocopherol is the most active vitamin and natural antioxidant existing in the nature known as vitamin E. Lacking of this vitamin makes drastic exchanges on the health of the living organisms. Their active chemical form is l-α-tocopherol substance. In this article, α-thiotocopherol a tocopherol derivative was synthesized via a precursor like dl-α-tocopherol, which has better antioxidant than natural α-tocopherol. And the last compound after separation and purification via TLC and PC procedures was analyzed by FTIR, GC-MS and elemental analysis, oxidative stability is tested with TGA method in air showing roughly antioxidant effect. Another approach is measurment of redox potential against a reference electrode under inert nitrogen atmosphere. 展开更多
关键词 TOCOPHEROL PHENOLS substitute phenols thiotocopherol redox potential thermal and oxidative stability.
下载PDF
Cu-SAPO-17:A novel catalyst for selective catalytic reduction of NOx
3
作者 Xiaona Liu Yi Cao +5 位作者 Nana Yan Chao Ma Lei Cao Peng Guo Peng Tian Zhongmin Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第11期1715-1722,共8页
The high-temperature(HT) and low-temperature(LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia(NH3-SCR). In this paper, we report a... The high-temperature(HT) and low-temperature(LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia(NH3-SCR). In this paper, we report a catalyst, Cu2+ loading SAPO-17, synthesized using cyclohexylamine(CHA), which is commercially available and inexpensive and is utilized in NH3-SCR reduction for the first time. After systematic investigations on the optimization of Si and Cu2+ contents, it was concluded that Cu-SAPO-17-8.0%-0.22 displays favorable catalytic performance, even after being heated at 353 K for 24 h and at 973 K for 16 h. Moreover, the locations of CHAs, host–guest interaction and the Bronsted acid sites were explored by Rietveld refinement against powder X-ray diffraction data of as-made SAPO-17-8.0%. The refinement results showed that two CHAs exist within one eri cage and that the protonated CHA forms a hydrogen bond with O4, which indicates that the proton bonding with O4 will form the Bronsted acid site after the calcination. 展开更多
关键词 SAPO-17 molecular sieve Rietveld refinement Host-guest interaction Selective catalytic reduction by ammonia(NH3-SCR) Hydrothermal stability Location of Cu2+
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部