本文在单因素实验的基础上,结合响应面分析法考察原料质量浓度、乙醇体积分数、超声功率、提取温度和提取时间等因素对桑叶提取物抑制脂肪酶活性的影响,优化桑叶抑制脂肪酶活性组分的超声波辅助提取工艺,并采用超高效液相色谱-四级杆-...本文在单因素实验的基础上,结合响应面分析法考察原料质量浓度、乙醇体积分数、超声功率、提取温度和提取时间等因素对桑叶提取物抑制脂肪酶活性的影响,优化桑叶抑制脂肪酶活性组分的超声波辅助提取工艺,并采用超高效液相色谱-四级杆-飞行时间高分辨质谱技术(Ultra-high Performance Liquid Chromatography-Quadrupole-Time of Flight High Resolution Mass Spectrometry,UPLC-Q-TOF HRMS)对桑叶提取物活性成分进行检测分析。结果表明,桑叶抑制脂肪酶活性组分的最佳提取工艺参数为原料质量浓度0.05 g/mL、乙醇体积分数70%、超声功率195 W、提取温度31℃、提取时间40 min,在此条件下测得桑叶提取物脂肪酶抑制率为39.68%。共鉴定出了1067种化合物,其中黄酮和酚酸类占比最高,分别含有203和201种化合物,这些化合物可能是桑叶提取物抑制脂肪酶活性的物质基础。本研究优化桑叶超声波辅助提取工艺,针对性地提高桑叶抑制脂肪酶活性组分的提取效率,并分析桑叶抑制脂肪酶活性的主要成分,可为桑叶在改善脂质代谢方面的功能性应用及健康食品研发提供参考。展开更多
AIM:To evaluate the clinical efficacy of small-diameter acellular porcine corneal stroma(SAPS)for the treatment of peripheral corneal ulceration(PCU).METHODS:This retrospective clinical study included 18 patients(18 e...AIM:To evaluate the clinical efficacy of small-diameter acellular porcine corneal stroma(SAPS)for the treatment of peripheral corneal ulceration(PCU).METHODS:This retrospective clinical study included 18 patients(18 eyes)with PCU between April 2018 and December 2020.All patients had PCU and underwent lamellar keratoplasty with SAPS.Observation indicators included preoperative and postoperative best-corrected visual acuity(BCVA)and transparency of SAPS.The infection control rate in the surgical eye-lesion area was also calculated.RESULTS:Eighteen patients underwent lamellar keratoplasty with SAPS to treat PCU.None of the patients experienced rejection after 6mo(18/18)and 12mo(16/16)of follow-up.The BCVA(0.47±0.30)at the 6mo followup after operation was significantly improved compared with the baseline(0.99±0.80),and the difference was statistically significant(Z=-3.415,P<0.05).The BCVA at the 12mo follow-up after operation was not statistically significant compared to the 6mo(Z=0,P=1).With time,the SAPS graft gradually became transparent.At the 6mo(18/18)and 12mo(16/16)follow-up,none of the patients had recurrent corneal infection.CONCLUSION:SAPS is clinically effective in the treatment of PCU,improving the patient’s BCVA and reducing the incidence of rejection after keratoplasty.展开更多
文摘本文在单因素实验的基础上,结合响应面分析法考察原料质量浓度、乙醇体积分数、超声功率、提取温度和提取时间等因素对桑叶提取物抑制脂肪酶活性的影响,优化桑叶抑制脂肪酶活性组分的超声波辅助提取工艺,并采用超高效液相色谱-四级杆-飞行时间高分辨质谱技术(Ultra-high Performance Liquid Chromatography-Quadrupole-Time of Flight High Resolution Mass Spectrometry,UPLC-Q-TOF HRMS)对桑叶提取物活性成分进行检测分析。结果表明,桑叶抑制脂肪酶活性组分的最佳提取工艺参数为原料质量浓度0.05 g/mL、乙醇体积分数70%、超声功率195 W、提取温度31℃、提取时间40 min,在此条件下测得桑叶提取物脂肪酶抑制率为39.68%。共鉴定出了1067种化合物,其中黄酮和酚酸类占比最高,分别含有203和201种化合物,这些化合物可能是桑叶提取物抑制脂肪酶活性的物质基础。本研究优化桑叶超声波辅助提取工艺,针对性地提高桑叶抑制脂肪酶活性组分的提取效率,并分析桑叶抑制脂肪酶活性的主要成分,可为桑叶在改善脂质代谢方面的功能性应用及健康食品研发提供参考。
基金Key R&D Plan of Shaanxi Province(No.2021SF-331).
文摘AIM:To evaluate the clinical efficacy of small-diameter acellular porcine corneal stroma(SAPS)for the treatment of peripheral corneal ulceration(PCU).METHODS:This retrospective clinical study included 18 patients(18 eyes)with PCU between April 2018 and December 2020.All patients had PCU and underwent lamellar keratoplasty with SAPS.Observation indicators included preoperative and postoperative best-corrected visual acuity(BCVA)and transparency of SAPS.The infection control rate in the surgical eye-lesion area was also calculated.RESULTS:Eighteen patients underwent lamellar keratoplasty with SAPS to treat PCU.None of the patients experienced rejection after 6mo(18/18)and 12mo(16/16)of follow-up.The BCVA(0.47±0.30)at the 6mo followup after operation was significantly improved compared with the baseline(0.99±0.80),and the difference was statistically significant(Z=-3.415,P<0.05).The BCVA at the 12mo follow-up after operation was not statistically significant compared to the 6mo(Z=0,P=1).With time,the SAPS graft gradually became transparent.At the 6mo(18/18)and 12mo(16/16)follow-up,none of the patients had recurrent corneal infection.CONCLUSION:SAPS is clinically effective in the treatment of PCU,improving the patient’s BCVA and reducing the incidence of rejection after keratoplasty.