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Xiangbin Chen, Jin Yin, Jianwen Ye, Haoqian Zhang, Xuemei Che, Yiming Ma, Mengyi Li, Lin-Ping Wu, Guo-Qiang Chen
Poly(3-hydroxybutyrate-co-4-hydroxybutyrate), short as P(3HB-co-4HB), was successfully produced by engineered Halomonas bluephagenesis TD01 grown in glucose and γ-butyrolactone under open non-sterile conditions. Gene orfZ encoding 4HB-CoA transferase of Clostridium kluyveri was integrated into the genome to achieve P(3HB-co-4HB) accumulation comparable to that of strains encoding orfZ on plasmids. Fed-batch cultivations conducted in 1-L and 7-L fermentors, respectively, resulted in over 70g/L cell dry weight (CDW) containing 63% P(3HB-co-12mol% 4HB) after 48h under non-sterile conditions...
July 27, 2017: Bioresource Technology
Hua-Wei Yuan, Li Tan, Hao Chen, Zhao-Yong Sun, Yue-Qin Tang, Kenji Kida
To establish a zero emission process, the post-distillation slurry of a new type of rice shochu (NTRS) was used for the production of health promoting vinegar. Since the NTRS post-distillation slurry contained caproic acid and lactic acid, the effect of these two organic acids on acetic acid fermentation was first evaluated. Based on these results, Acetobacter aceti CICC 21684 was selected as a suitable strain for subsequent production of vinegar. At the laboratory scale, acetic acid fermentation of the NTRS post-distillation slurry in batch mode resulted in an acetic acid concentration of 41...
July 22, 2017: Journal of Bioscience and Bioengineering
Iva Anic, Arijit Nath, Pedro Franco, Rolf Wichmann
In this report, a method for a simultaneous production and separation of a microbially synthesized rhamnolipid biosurfactant is presented. During the aerobic cultivation of flagella-free Pseudomonas putida EM383 in a 3.1L stirred tank reactor on glucose as a sole carbon source, rhamnolipids are produced and excreted into the fermentation liquid. Here, a strategy for biosurfactant capture from rhamnolipid enriched fermentation foam using hydrophobic-hydrophobic interaction was investigated. Five adsorbents were tested independently for the application of this capture technique and the best performing adsorbent was tested in a fermentation process...
July 16, 2017: Journal of Biotechnology
Sonia Martínez-Cámara, Esther Bahíllo, José-Luis Barredo, Marta Rodríguez-Sáiz
Phytosterols, generated as a by-product of vegetable oils or wood pulp, contain the cyclopentane-perhydro-phenanthrene nucleus, and can be converted into steroid intermediates by removing the C17 side chain. This chapter shows the scale-up, from flask to fermentor, of the phytosterols bioconversion into 4-androstene-3,17-dione (androstenedione; AD) with Mycobacterium neoaurum B-3805. Due to the fact that phytosterols and AD are nearly insoluble in water, two-phase systems and the use of chemically modified cyclodextrins have been described as methods to solve it...
2017: Methods in Molecular Biology
Ping Yu, Pengzhi Zhu
S-adenosyl-L-methionine (SAM) has important applications in many fields including the chemical therapy and the pharmaceutical industry. In this study, the recombinant Escherichia coli strain was constructed for effective production of SAM by introducing the SAM synthase gene (metK). This strain produced 34.5 mg/l of SAM in basic medium in shake flask. Yeast extract, pH and loaded volume had a significant positive effect on the yield of SAM. Their optimal values were 35 g/l, 7.5 and 30 ml, respectively...
July 14, 2017: Preparative Biochemistry & Biotechnology
Yi-Nan Yang, Wen-Xin Shan, Pi-Wu Wang
Cyclodextrin glucanotransferase (CGTase) is an important enzyme with multiple functions in starch utilization. In the present study, a fermentation process for the production of CGTase from Escherichia coli harboring the recombinant plasmid pET28b(+)-CGTase was investigated and optimized. The optimal fermentation and expression conditions were 10.0 g/L glycerol, 20.0 g/L tryptone, and 10.0 g/L yeast extract with an initial pH of 7.0, an IPTG concentration of 0.1 mM and an induction temperature of 28 °C for 10 h...
July 2017: 3 Biotech
N Yang, X Wang, D Teng, R Mao, Y Hao, X Feng, J Wang
The marine antimicrobial peptide NZ17074, a variant of arenicin-3 from Arenicola marina that has broad antimicrobial activity and high bioavailability, can be designed to treat bacterial and fungal diseases. To reduce the toxicity of NZ17074, N6 was designed by replacing a cysteine in positions 3 and 20 with alanine, fused to the C-terminus of the small ubiquitin-like modifier tag (SUMO), and expressed in yeast. SUMO-N6 yielded as much as 921 mg l(-1) at 72 h after induction in a fermentor and increased 1·8-fold over SUMO-NZ17074...
June 28, 2017: Letters in Applied Microbiology
Hesty Heryani, Meilana Dharma Putra
Surfactants are very important in industry. The cost of commercial surfactant production is still high and the surfactant demand is constantly increasing. Microbial production of surfactant known as biosurfactant shows commercial potency. Utilization of Bacillus sp. strain on glucose fermentation for biosurfactant production was then studied. This type of microbe was isolated from soil contaminated with palm oil. The selection of the strain was based on its ability to form emulsifying zone around the colony and its capability to grow compared with those for commercial bacteria of Bacillus pumilus JCM 2508...
August 2017: Data in Brief
Bucheng Wang, Lu Jiang, Hechao Bai, Qiang Yong, Shiyuan Yu
OBJECTIVE: To protect the enzymes during fed-batch cellulase production by means of partial enzyme recovery at regular intervals. RESULTS: Extracellular enzymes were partially recovered at the intervals of 1, 2, or 3 days. Mycelia were also removed to avoid contamination. Increases in the total harvested cellulase (24-62%) and β-glucosidase (22-76%) were achieved. In fermentor cultivation when the enzymes were recovered every day with 15% culture broth. The total harvested cellulase and β-glucosidase activity increased by 43 and 58%, respectively, with fungal cell concentration maintained at 3...
June 13, 2017: Biotechnology Letters
Ramesh Prasad Pandey, Prakash Parajuli, Anaya Raj Pokhrel, Jae Kyung Sohng
7,8-Dihydroxyflavone (7,8-DHF) has been conjugated with glucose moiety to produce glucoside derivatives. Three analogues of 7,8-DHF (7-O-β-d-glucosyl-8-hydroxyflavone, 7-hydroxy-8-O-β-d-glucosyl flavone, and 7,8-di-O-β-d-glucosylflavone) have been successfully produced from in vitro reaction using glycosyltransferase of Bacillus licheniformis. Production of these 7,8-DHF derivatives were shifted to cheaper and easier approach in this study by using engineered Escherichia coli BL21 (DE3) ΔpgiΔzwfΔushA cells in which the flow of glucose-6-phospahte toward glycolysis and pentose phosphate pathway and hydrolysis of UDP-α-d-glucose were blocked while directing the carbon flux toward UDP-α-d-glucose by overexpressing UDP-α-d-glucose pathway genes...
June 12, 2017: Biotechnology and Applied Biochemistry
Qin Wang, Hui Zheng, Xia Wan, Hongfeng Huang, Junhui Li, Christopher T Nomura, Changjun Wang, Shouwen Chen
Bacitracin is a broad-spectrum antibiotic used extensively as a feed additive. In this study, inexpensive agricultural by-products were used as nitrogen sources for bacitracin production. Based on both the orthogonal tests, a combination of 7% soybean meal (SBM) +2% low protein rapeseed cake (LPRC) was optimal for bacitracin production. Compared to the original formula, the titer of bacitracin increased by 20.5% reaching 910.4 U/ml in flasks. The titer of bacitracin and the ratio of bacitracin A increased by 12...
June 7, 2017: Applied Biochemistry and Biotechnology
F Moens, L De Vuyst
Four selected butyrate-producing colon bacterial strains belonging to Clostridium cluster IV (Butyricicoccus pullicaecorum DSM 23266(T) and Faecalibacterium prausnitzii DSM 17677(T)) and XIVa (Eubacterium hallii DSM 17630 and Eubacterium rectale CIP 105953(T)) were studied as to their capacity to degrade inulin-type fructans and concomitant metabolite production. Cultivation of these strains was performed in bottles and fermentors containing a modified medium for colon bacteria, including acetate, supplemented with either fructose, oligofructose, or inulin as the sole energy source...
May 30, 2017: Beneficial Microbes
Wenhan Yang, Yongzhi Yang, Lingdi Zhang, Hang Xu, Xiaojing Guo, Xu Yang, Bing Dong, Yunhe Cao
As a feed additive, xylanase has been widely applied in the feed of monogastric animals, which contains multiple plant polysaccharides. However, during feed manufacture, the high pelleting temperatures challenge wild-type xylanases. The aim of this study was to improve the thermostability of Aspergillus sulphureus acidic xylanase. According to the predicted protein structure, a series of disulphide bridges and proline substitutions were created in the xylanase by PCR, and the mutants were expressed in Pichia pastoris...
May 8, 2017: Scientific Reports
Hisashi Arikawa, Shunsuke Sato, Tetsuya Fujiki, Keiji Matsumoto
We developed a new method for isolation and quantitation of polyhydroxyalkanoate (PHA) from culture broth. In this method, the cells were sonicated in sodium dodecyl sulfate (SDS) solution and centrifuged to recover PHA. The recovered PHA was rinsed with deionized water and ethanol, and then weighed after drying. Hazardous chemicals such as chloroform, methanol, and sulfuric acid were not used, and no expensive analytical instruments were needed. We applied this method to Cupriavidus necator culture broths that included various amounts of poly(3-hydroxybutyrate) (PHB) or poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) from flasks and jar fermentors...
April 26, 2017: Journal of Bioscience and Bioengineering
B A Wenner, J de Souza, F Batistel, T J Hackmann, Z Yu, J L Firkins
The objective of this study was to evaluate the effects of altering pH and solids passage rate (kp) on concentration of aqueous H2 [H2(aq)], CH4 production, volatile fatty acids (VFA) production, and fiber digestibility in a continuous culture fermentation system. The present study was conducted as a 2 × 2 factorial treatment arrangement in a Latin square design using continuous culture fermentors (n = 4). Our continuous culture system was converted to a closed system to measure CH4 and H2 emission while measuring H2(aq) concentration and VFA production for complete stoichiometric assessment of fermentation pattern...
July 2017: Journal of Dairy Science
E M Paula, H F Monteiro, L G Silva, P D B Benedeti, J L P Daniel, T Shenkoru, G A Broderick, A P Faciola
Previous research indicated that there were significant differences in rumen-undegradable protein (RUP) among canola meals (CM), which could influence the nutritional value of CM. The objectives of this study were to (1) evaluate the effects of feeding CM with different RUP contents on ruminal fermentation, nutrient digestion, and microbial growth using a dual-flow continuous culture system (experiment 1) and (2) evaluate ruminal gas production kinetics, in vitro organic matter (OM) digestibility, and methane (CH4) production of soybean meal (SBM) and CM with low or high RUP in the diet or as a sole ingredient using a gas production system (experiments 2 and 3)...
July 2017: Journal of Dairy Science
Luan Luong Chu, Ramesh Prasad Pandey, Haet Nim Lim, Hye Jin Jung, Nguyen Huy Thuan, Tae-Su Kim, Jae Kyung Sohng
BACKGROUND: Umbelliferone, also known as 7-hydroxycoumarin, is a phenolic metabolite found in many familiar plants. Its derivatives have been shown to have various pharmacological and chemo-preventive effects on human health. A uridine diphosphate glycosyltransferase YjiC from Bacillus licheniformis DSM 13, a cytochrome P450BM3 (CYP450 BM3) variant namely mutant 13 (M13) from Bacillus megaterium, and an O-methyltransferase from Streptomyces avermitilis (SaOMT2) were used for modifications of umbelliferone...
2017: Journal of Biological Engineering
Lingtian Wu, Shanshan Wu, Juanjuan Qiu, Chuanxue Xu, Sha Li, Hong Xu
A green process and environmentally benign process is highly desirable in the development of enzymatic catalysis. In this work, the shuttle plasmid pHA01 was constructed and the sucrose isomerase (SIase) was expressed in Bacillus subtilis WB800. The optimal nitrogen and carbon sources for SIase expression were yeast extract (15g/L) and un-pretreated cane molasses (UCM, 20g/L), respectively. After the UCM fed, the whole cell activity reached 5.2U/mL in a 7.5L fermentor. Optimum catalytic temperature and pH of whole cell were 35°C and 5...
August 15, 2017: Food Chemistry
Varnika Roy, Robert Roth, Mark Berge, Rajesh Chitta, Sucheta Vajrala, Srilatha Kuntumalla, Albert E Schmelzer, Ron Schoner
Human neurturin (NTN) is a cystine knot growth factor with potential therapeutic use in diseases such as Parkinson's and diabetes. Scalable high titer production of native NTN is particularly challenging because of the cystine knot structure which consists of an embedded ring comprised of at least three disulfide bonds. We sought to pursue enhanced scalable production of NTN in Escherichia coli. Our initial efforts focused on codon optimization of the first two codons following AUG, but these studies resulted in only a marginal increase in NTN expression...
August 2017: Biotechnology and Bioengineering
Panyu Li, Yi Xie, Yu Zeng, Wanrong Hu, Yan Kang, Xiang Li, Yabo Wang, Tonghui Xie, Yongkui Zhang
Kitchen waste (KW) is a worldwide issue, which can lead to environment pollution. Nevertheless, it is also a low-cost and sustainable resource for bio-production. Meanwhile, welan gum (WG) is one kind of the most important exopolysaccharide but with high material cost. The aim of this study was to adopt two-step enzymatic hydrolysis to improve the release and recovery of both sugar and protein in KW for subsequent WG production. As the results, the recovery rates of sugar and protein reached 81.07 and 77.38%, which were both satisfactory...
April 1, 2017: Applied Biochemistry and Biotechnology
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