INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Jingren Li,Ronghua Peng,Wei Li,Shilin Guo,Yanbo Liu,Zhenkai Cen,Dandan Han,Songgu Wu,Junbo Gong
As one of the eight essential amino acids in the human body, l-isoleucine plays an important role in human life metabolism and can be applied as a nutritional supplement and food additive in the food field. However, the crystallization of l-isoleucine is generally flaky with poor powder properties, such as bulk density and flowability, which is not conducive to a wide range of industrial applications. In this study, we successfully prepared large spherical particle crystals via two different ways of crystallization. l-Isoleucine undergoes the evolution from initial round flakes to three-dimensional petal-like structures and finally to spherical particles by evaporation crystallization in the presence of hydroxypropylmethylcellulose (HPMC). l-Isoleucine also aggregates into spherical particles in the acid–base reaction crystallization process by adding a small amount of suitable and volatile bridging liquids, such as cyclohexane and ethyl acetate. In conclusion, both approaches improved the crystal properties of l-isoleucine and produced spherical particles with a larger particle size, higher bulk density, and higher compression resistance, thereby providing new insight into the preparation of high-quality l-isoleucine.
研究领域:
食品科学
·
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiang Feng,Mingyan Li,Junyi Yin,Tianyi Cui,Fuxiang Li,Yonghong Cheng,Shujiang Ding,Xin Xu,Jianhua Wang
Amino acids are considered effective additives for regulating the electric double layer (EDL) in zinc-ion battery (ZIB) electrolytes. In comparison to their polar counterparts, nonpolar amino acids have received less attention in research. We demonstrated that isoleucine (ILE), benefiting from its nonpolar alkyl chain, emerges as a highly suitable electrolyte additive for aqueous ZIBs. ILE molecules preferentially adsorb onto the anode surface of zinc metal, subsequently creating a locally hydrophobic EDL facilitated by the alkyl chain. On one hand, this enhances the thermodynamic stability at the anode, while on the other hand, it accelerates the desolvation process of zinc ions, thereby improving the kinetics. Benefiting from the unique properties of ILE molecules, Cu//Zn cells with the ILE additive ultimately achieved an extended cycle life of 2600 cycles with an average coulombic efficiency of 99.695%, significantly outperforming other amino acid additives reported in the literature.
研究领域:
材料科学
·
电化学
·
生物化学
✓ 已验证
DOI
高影响因子
International Journal of Clinical and Experimental Pathology
·
2015
·
IF 1.891
Qingwei Zhang,Haiya Wu,Congcong Wen,Fa Sun,Xuezhi Yang,Lufeng Hu
MGCD0103, an isotype-selective HDACi, has been clinically evaluated for the treatment of hematologic malignancies and advanced solid tumors, alone and in combination with standard-of-care agents. In this study, we developed a serum metabolomic method based on gas chromatography-mass spectrometry (GC-MS) to evaluate the effect of intragastric administration of MGCD0103 on rats. The MGCD0103 group rats were given 20, 40, 80 mg/kg of MGCD0103 by intragastric administration each day for 7 days. Pattern recognition analysis, including both principal component analysis (PCA) and partial least squares-discriminate analysis (PLS-DA) revealed that intragastric administration of MGCD0103 induced metabolic perturbations. As compared to the control group, the levels of L-alanine, L-isoleucine, and L-leucine of MGCD0103 group decreased. The results indicate that metabolomic methods based on GC-MS may be useful to elucidate side effect of MGCD0103 through the exploration of biomarkers (L-alanine, L-isoleucine, and L-leucine). According to the pathological changes of liver at difference dosage, MGCD0103 is hepatotoxic and its toxity is dose-dependent.
研究领域:
药理学
·
代谢组学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2025
·Vol. 41
·期 4
·1-15
·
IF 4.2
Zhao Jing-yi,Gao Fan,Wu Mengru,Li Yang,Chen Yong,Xiao Zijun
Enantiopure ( S )-2-methylbutanoic acid [( S )-2-MBA] is a high-value chiral compound with applications in fragrances, pharmaceuticals, and agrochemicals. However, conventional chemical synthesis lacks stereoselectivity, while existing biosynthetic methods suffer from low yield and purity. Here, we report a novel microbial process using Bacillus spizizenii ATCC 6633 for efficient ( S )-2-MBA production via L-isoleucine catabolism. Through targeted screening of rhizospheric soil isolates and Bacillaceae strains, ATCC 6633 demonstrated superior performance, producing 3.67 g/L ( S )-2-MBA with 99.32% enantiomeric excess ( ee ) under optimized conditions (45 °C, 8% inoculation, 5 g/L glucose, and 8 g/L L-isoleucine). A 58.92% conversion efficiency was achieved, and a simplified purification process recovered 63.90% product with 97.32% purity. Mechanistic studies suggested glucose depletion triggered ( S )-2-MBA accumulation, aligning with starvation-induced secondary metabolism. This cost-effective, eco-friendly approach eliminates racemic separation steps and harsh reagents, positioning ATCC 6633 as a promising biocatalyst for sustainable ( S )-2-MBA production.
研究领域:
生物化学
·
微生物学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Bioengineered
·
2020
·
IF 2.205
Haibo Xiong,Yunpeng Liu,Qingyang Xu
Corynebacterium glutamicum is a safe and popular industrial microorganism that it is gram-positive bacteria with thick cell walls, which hinder the extracellular secretion of products. Surfactant has good surface or interface activity and can destroy the cell membrane of microorganisms. In this study, the surfactant SDS was used to artificially destroy the cell membrane of Corynebacterium glutamicum, increase the permeability of the cell membrane, and increase the ability of the strain to secrete L-isoleucine. This is the first time that surfactants have been applied to the fermentation of Corynebacterium glutamicum. Results indicated that after optimization, the output of L-isoleucine reached 43.67 g/L, which was 13.01% higher than that without sodium dodecyl sulfate. The yield of the by-products, such as valine, leucine, and alanine, was reduced by 72.30%, 64.30%, 71.70%, respectively. This method can promote the production of L-isoleucine while minimizing the damage of SDS to the strain.
研究领域:
生物技术
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
TRANSGENIC RESEARCH
·
2025
·Vol. 34
·期 1
·1-17
·
IF 2
Yang Yanhui,Lu Jun,Xue Tianrui,Cao Zhenli,Li Mingjie,Zhang Zhongyi,Wang Rong,Wu Tongyu
The Agrobacterium tumefaciens mediated transformation is the prevailing methodology for plant genetic manipulation; however, A. tumefaciens overgrowth is a common constraint in the process. Exploring auxotrophic A. tumefaciens could reduce overgrowth and enhance plant transformation efficiency. The ILVC gene, which encodes the ketol-acid isomeroreductase, is critical for Valine (Val) and isoleucine (Ile) biosynthesis in some microorganisms. However, its function in A. tumefaciens is unclear. To ascertain the function of ILVC and generate an auxotrophic A. tumefaciens , this study employed an allelic exchange to disrupt the ILVC in A. tumefaciens strain GV3101. This resulted in the loss of ketol-acid isomeroreductase activity and the prevention of Val and Ile biosynthesis, creating a dual-auxotrophic GV3101 ∆ILVC . Transient expression assays in Nicotiana benthamiana transformation demonstrated that the GV3101 ∆ILVC was capable of T-DNA transfer. Moreover, stable genetic transformation analysis in N. benthamiana indicated that the introduction of GV3101 ∆ILVC led to a reduction in overgrowth within infected plant tissues. Additionally, an enhancement in transformation efficiency was observed with the prolongation of the co-cultivation time of the explant-infected strain. This study revealed the function of ILVC and explored a dual-auxotrophic A. tumefaciens for Val and Ile, potentially broadening the utilization of auxotrophic strains in plant genetic transformation.
研究领域:
植物学
·
微生物学
·
遗传学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Yankui Xing,Zhengda Zhou,Fangfang Li,Shuangping Tian,Yuxi Liang,Sixian Li,Yanan Zhou,Yun Gao
Thermodynamic properties, which play an important role in design and optimization of crystallization processes, are the essential data for the study of crystal nucleation and growth. In this study, the solubility of L-isoleucine were firstly determined by gravimetric method in three binary solvent mixtures including water + (ethanol, acetonitrile or DMSO) in the temperature range of 303.20 K to 338.05 K at atmospheric pressure. The effects of temperatures and solvent types on the dissolution process of L-isoleucine were investigated. It was found that the solubility of L-isoleucine increased dramatically with the increasing of the mole fraction of water in each binary solvent mixture and increased monotonically with the increasing of temperature. To extend the applicability of the solubility data, the experimental solubility data of L-isoleucine were fitted and analyzed using the modified Apelblat equation, the CNIBS/R-K model and the Jouyban-Acree model. Finally, based on the Van’t Hoff equation and the experimental solubility data, the apparent dissolution thermodynamic properties of L-isoleucine including apparent dissolution enthalpy, apparent dissolution entropy, and apparent Gibbs free energy change of dissolution process were calculated and discussed.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL GENETICS
·
2019
·Vol. 57
·期 3
·443-454
·
IF 1.931
Zhang Yu,Zhang Xiaohuan,Xiao Shiyuan,Qi Wei,Xu Jingliang,Yuan Zhenhong,Wang Zhongming
3-Methyl-1-butanol (3MB) is a promising biofuel that can be produced from 2-ketoisocaproate via the common l -leucine biosynthesis pathway. Corynebacterium glutamicum was chosen as a host bacterium because of its strong resistance to isobutanol. In the current study, several strategies were designed to overproduce 3MB in C. glutamicum through a non-fermentation pathway. The engineered C. glutamicum mutant was obtained by silencing the pyruvate dehydrogenase gene complex ( aceE ) and deleting the lactic dehydrogenase gene ( ldh ), followed by mutagenesis with diethyl sulfate (DES) and selection with Fmoc-3-4-thiazolyl- l -alanine (FTA). The mutant could produce 659 mg/L of 3MB after 12 h of incubation. To facilitate carbon flux to 3MB biosynthesis, the engineered recombinant was also constructed without branched-chain acid aminotransferase ( ilvE ) activity by deleting the ilvE gene. This recombinant could produce 697 mg/L of 3MB after 12 h of incubation.
研究领域:
微生物学
·
生物技术
·
代谢工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2015
·Vol. 33
·期 12
·1359-1364
·
IF 1.578
Su Guo,Fang Zhang,Haoyang Wang,Manyu Zhang,Zhixu Zhang,Xiang Zhang,Yinlong Guo
In this study, ion mobility separation coupled with tandem mass spectrometry (IM-tandem MS) was utilized to investigate the ionization behaviors of two amino acids including leucine and isoleucine. Under the electrospray ionization (ESI) mode, two protonation sites in each molecular sturcture caused two forms of protomer. One arose from the amino being protonated (amino-protomer) and the other from the carboxyl being protonated (carboxyl-protomer). In the two-dimensional (drift time, m/z ) spectrum, the protomers had the same mass, but the distinguishable drift times and fragmentation patterns. For the characterization purpose, the theoretical collision cross section (CCS) values of the protomers were calculated and proven to be consistent with the experimental. Moreover, the quantified relationship between the amino acids and their protomers was evaluated. It showed that the abundance of the carboxyl-protomer was proportional to the concentration of the amino acid, whereas that of the amino-protomer did not have the same trend. Under the atmospheric pressure chemical ionization (APCI) mode, only the carboxyl-protomer was observed. In addition, the amino-protomer and the cluster ions observed under ESI were absent completely. The results demonstrate that the ionization mode impacts heavily on the ionization behaviors of leucine and isoleucine not only on the form of therir protomers but also on the quantified relationship.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Endocrinology
·
2025
·
IF 4.6
Emmanuel Osei Nkansah,Yunzhu Lan,Hui Zhang,Binbin Xu,Qiaodan Li,Mohammad Ishraq Zafar,Jian Xu
Background: Obesity is associated with hormonal imbalance, increased oxidative stress, and inflammation in the testis. These conditions adversely affect sperm quality, leading to impaired male fertility. Therefore, therapeutic interventions to counteract the adverse effects of obesity are crucial. This study explored the therapeutic effects of 4-hydroxyisoleucine (4-HIL) on fertility in male mice with diet-induced obesity.Methods: C57BL6 male mice (n=45) were randomly divided into normal diet (ND, n=15) and high-fat diet (HFD, n=30) groups for 10 weeks. The HFD group was then randomized into untreated (HFD, n=15) and 4-HIL-treated (200 mg/kg/day, intraperitoneal injection, HFD + 4-HIL group, n=15) for 6 weeks. ND and HFD controls received saline (0.3 mL/30 g body weight) throughout the intervention period. Comprehensive evaluations included (1) metabolic assessments (body weight, glucose, insulin and pyruvate tolerance tests, and blood serum lipids), (2) sperm analysis (count, concentration, and morphology), (3) fertility testing (mating trials and in vitro fertilization), (4) testicular histopathology (fat deposition and apoptosis), (5) biochemical assays (reproductive hormones, oxidative stress markers, and inflammatory cytokines), and (6) molecular analyses (mRNA sequencing and qPCR validation of differentially expressed genes).Results: 4-HIL treatment improved metabolic parameters, including reduced weight gain, enhanced glucose tolerance, and optimized blood serum lipids, compared to HFD controls. Treated mice exhibited superior sperm quality with increased count and concentration, reduced histomorphological abnormalities in the testis, and attenuated oxidative stress and inflammation. Furthermore, the key spermatogenic gene expressions, including spem1 and spata24, were significantly optimized in the testes of mice treated with 4-HIL compared to those of untreated mice (HFD group).Conclusion: This study demonstrates that 4-HIL therapy ameliorates obesity-induced testicular dysfunction and improves fertility markers in mice. The beneficial effects of this compound on metabolic parameters, sperm quality, and spermatogenic gene expression suggest its potential as a therapeutic agent for obesity-related male infertility. Further research is warranted to elucidate the underlying mechanisms and assess the clinical translatability of these findings.
研究领域:
内分泌学
·
生殖生物学
·
药理学
·
分子生物学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Enming Dong,Ziming Yang,Chuang Zhou,Chao Wang,Sidong Li,Qianqian Ouyang,Lingxue Kong,Zuyu He,Jianghui Xie,Puwang Li,Peihui Yang
In this paper, we synthesized amphiphilic chitosan using one-pot method with the goal to develop delivery system for the natural pesticide spinosad . Chitosan-Isoleucine-Polyethylene glycol methyl ether (CIP) copolymers based nanomicelles (CIPNMs) were prepared by self-assembly with the assistance of ultrasonic treatment and then the spinosad was loaded on the micelles . Sphere-shaped spinosad-loaded CIPNMs (SSD@CIPNMs) with the particle sizes of approximately 454.9 nm were obtained with the CIP co -polymers. The shell of CIPNMs could effectively prevent the photodegradation of spinosad and played a role of protective barrier. In addition, the prepared SSD@CIPNMs not only delayed the release of spinosad but also had a property of pH-responsive. The release rate of SSD@CIPNMs at pH = 6.4 was greater than that of at pH = 7.0. And, the contact angle of SSD@CIPNMs on banana leaves surface was 60.47°, which meant SSD@CIPNMs had a good affinity with banana leaves. Furthermore, SSD@CIPNMs showed higher antifungal activity against Fusarium oxysporum compared with the unencapsulated spinosad at the same drug dose. This work was contribution to the development of nano-drug carrier systems of natural polymer materials, with a great potential for targeted treatment of banana wilt.
研究领域:
农业科学
·
植物病理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2022
·
IF 5.318
Chang Liu,Yahui Guo,He Qian,Yuliang Cheng
Inulin can regulate the intestinal micro-ecological balance, but there are few studies on the changes of intestinal microbiota and its metabolites in vitro and vivo , SCFAs and amino acids in particular. In this study, the human fecal microbiota glycolysis model and a mouse model were used to study the mechanism of inulin on intestinal microecology. Combined with metabolism of microbiome and metabolome , the cross-synergism mechanism of inulin-micribiota-metabolites-metabolism was investigated. The results revealed that after inulin was fermented by human intestinal microbiota , the relative abundance of Lactobacillus , Bifidobacterium , Prevotella , Catenibacterium , and Agathobacter increased. In vivo , the concentration of SCFAs increased after inulin was fermented, and the abundance of Parabacteroides , Muribaculaceae and Alloprevotella increased. Both in vivo and in vitro experiments revealed that inulin can regulate the expression of 5 genes involved in Valine , leucine and isoleucine degradation. In addition, the metabolome results confirmed that Valine, leucine and isoleucine degradation, Tyrosine metabolism, and Synthesis and degradation of ketone bodies are regulatory pathways of inulin. More importantly, L−tryptophan, tyrosine, L−fucose, L−ornithine, D−fructose, D−erythrose, and pyruvic acid are hallmark metabolites of inulin metabolized by gut microbiota. The cross-synergism network greatly indicated the microbiota ( Streptococcus , Lactobacillus , Muribaculaceae), metabolites ( l -tryptophan, pyruvic acid), and metabolism (Lysine degradation, Tryptophan metabolism , Synthesis and degradation of ketone bodies) may be the key factors involved in the mechanisms regulating the in vitro and vivo effects of inulin.
研究领域:
微生物学
·
代谢组学
·
营养科学
·
胃肠病学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）