本研究旨在运用高通量测序技术研究益生菌Bacillus subtilis YK-1R对断奶仔猪肠道菌群的影响。挑选21日龄断奶仔猪14头,随机分成两组,即益生菌组与空白对照组,每组各7头仔猪。益生菌组每头仔猪每天灌胃15 m L浓度为109cfu/m L的益生菌,...本研究旨在运用高通量测序技术研究益生菌Bacillus subtilis YK-1R对断奶仔猪肠道菌群的影响。挑选21日龄断奶仔猪14头,随机分成两组,即益生菌组与空白对照组,每组各7头仔猪。益生菌组每头仔猪每天灌胃15 m L浓度为109cfu/m L的益生菌,对照组每天灌胃15 m L磷酸缓冲液（PBS）。在实验第0天、第14天、第28天采集每头仔猪新鲜粪便样品,采用高通量测序技术分析仔猪肠道菌群组分与结构变化。研究表明,在实验第14天时,益生菌显著提高断奶仔猪生长性能（p〈0.01）、肠道菌群alpha多样性（p〈0.05）,降低仔猪腹泻率,提高饲料利用率;基于unweighted Uni Frac距离多元方差分析（MANOVA）表明,此时益生菌组与对照组仔猪肠道菌群结构有显著差异（p〈0.01）。由此可见,益生菌Bacillus subtilis YK-1R能增加仔猪肠道菌群多样性,促进仔猪健康生长。展开更多
YK- 1101, with its structure as S-（（E）-4-（（7S, 10S,Z）-4-ethylidene-7-isopropyl-2,5,8,12- tetraoxo -9-oxa- 16-thia-3,6,13,18-tetraazabicyclo[ 13.2.1 ]octadeca- 1 （17）, 15（ 18）-dien- 10-yl）but-3-en- 1 -y l） ...YK- 1101, with its structure as S-（（E）-4-（（7S, 10S,Z）-4-ethylidene-7-isopropyl-2,5,8,12- tetraoxo -9-oxa- 16-thia-3,6,13,18-tetraazabicyclo[ 13.2.1 ]octadeca- 1 （17）, 15（ 18）-dien- 10-yl）but-3-en- 1 -y l） ethanethioate, is synthesized as a potential histone deacetylase inhibitor. Its quality and stability under various stress conditions are not fully understood. In this study, a high performance liquid chromatographic （HPLC） method was established and validated for the analysis of YK-1101 bulk drug samples. The chromatographic separation was performed on a C18 column with acetonitrile and water as mobile phase in a gradient elution. Based on the established method, the stability studies of YK-1101 under various stress conditions were carried out. YK-1101 was shown to undergo degradation under basic and acidic stress conditions, while it was stable under oxidative, photolytic and thermal conditions. In addition~ a time of flight mass spectrometer （TOF/MS） was coupled to HPLC for the characterization of major degradation products produced under basic and acidic stress conditions. Their degradation pathways were also discussed.展开更多
文摘本研究旨在运用高通量测序技术研究益生菌Bacillus subtilis YK-1R对断奶仔猪肠道菌群的影响。挑选21日龄断奶仔猪14头,随机分成两组,即益生菌组与空白对照组,每组各7头仔猪。益生菌组每头仔猪每天灌胃15 m L浓度为109cfu/m L的益生菌,对照组每天灌胃15 m L磷酸缓冲液（PBS）。在实验第0天、第14天、第28天采集每头仔猪新鲜粪便样品,采用高通量测序技术分析仔猪肠道菌群组分与结构变化。研究表明,在实验第14天时,益生菌显著提高断奶仔猪生长性能（p〈0.01）、肠道菌群alpha多样性（p〈0.05）,降低仔猪腹泻率,提高饲料利用率;基于unweighted Uni Frac距离多元方差分析（MANOVA）表明,此时益生菌组与对照组仔猪肠道菌群结构有显著差异（p〈0.01）。由此可见,益生菌Bacillus subtilis YK-1R能增加仔猪肠道菌群多样性,促进仔猪健康生长。
基金supported by the postgraduate innovation foundation of Simcere (No. CX11S-002XS)
文摘YK- 1101, with its structure as S-（（E）-4-（（7S, 10S,Z）-4-ethylidene-7-isopropyl-2,5,8,12- tetraoxo -9-oxa- 16-thia-3,6,13,18-tetraazabicyclo[ 13.2.1 ]octadeca- 1 （17）, 15（ 18）-dien- 10-yl）but-3-en- 1 -y l） ethanethioate, is synthesized as a potential histone deacetylase inhibitor. Its quality and stability under various stress conditions are not fully understood. In this study, a high performance liquid chromatographic （HPLC） method was established and validated for the analysis of YK-1101 bulk drug samples. The chromatographic separation was performed on a C18 column with acetonitrile and water as mobile phase in a gradient elution. Based on the established method, the stability studies of YK-1101 under various stress conditions were carried out. YK-1101 was shown to undergo degradation under basic and acidic stress conditions, while it was stable under oxidative, photolytic and thermal conditions. In addition~ a time of flight mass spectrometer （TOF/MS） was coupled to HPLC for the characterization of major degradation products produced under basic and acidic stress conditions. Their degradation pathways were also discussed.
