The fruits of Piper cubeba have been used in Ayurvedic system of medicine for pain,tastelessness, painful urination and mouth diseases. Among its various chemical constituents,(-)-hinokinin, a trypanosomicidal diben...The fruits of Piper cubeba have been used in Ayurvedic system of medicine for pain,tastelessness, painful urination and mouth diseases. Among its various chemical constituents,(-)-hinokinin, a trypanosomicidal dibenzylbutyrolactone lignan, is found in significant quantities.For quality evaluation of P. cubeba fruit and its commercial formulations, there is an urgent need to develop an analytical method based on(-)-hinokinin. For this purpose, an HPLC method was developed using photo diode array detector and Waters HR C18 column with gradient elution consisting of water and acetonitrile. The developed method was validated as per ICH-Q2 B guidelines and found to be accurate, precise and linear over a wide range of concentrations(5–300 mg/m L).(-)-Hinokinin contents were found to be in the range of 0.005–0.109%(m/m) in various P. cubeba samples. The developed method was extended to LC–MS for further identification and characterization of(-)-hinokinin in samples. The developed method is simple,rapid and specific, and can be used as a tool for quality control of P. cubeba fruits and its commercial formulations.展开更多
为保证原料乳质量,丰富检测原料乳中大肠菌群涉及到的培养基的验收质控菌株,采用GB 4789.28—2013《食品安全国家标准 食品微生物学检验 培养基和试剂的质量要求》中规定的验收方法,分别选取3个品牌的结晶紫中性红胆盐琼脂(violet red b...为保证原料乳质量,丰富检测原料乳中大肠菌群涉及到的培养基的验收质控菌株,采用GB 4789.28—2013《食品安全国家标准 食品微生物学检验 培养基和试剂的质量要求》中规定的验收方法,分别选取3个品牌的结晶紫中性红胆盐琼脂(violet red bile agar,VRBA)、结晶紫中性红胆盐-4-甲基伞形酮-β-D-葡萄糖苷琼脂(violet red bile agar with MUG,VRBA-MUG)、月桂基硫酸盐胰蛋白胨肉汤(lauryl tryptose broth,LST)和煌绿乳糖胆盐肉汤(brilliant green lactose bile broth,BGLB),对其进行外观、pH值、水分含量等物理指标以及生长率、选择性等微生物指标实验评价。同时以弗式柠檬酸杆菌ATCC 43864为参照,选取7株弗式柠檬酸杆菌对3个品牌的VRBA、VRBA-MUG、LST和BGLB进行验收实验评价。结果表明:3个品牌的不同培养基干粉颜色均正常,水分含量均控制在5%~6%,pH值均符合国家标准;7株弗氏柠檬酸杆菌在3个品牌VRBA、VRBA-MUG上的生长率均大于0.7;仅CMCC 48098和CICC 22910在3个品牌的LST、BGLB中浊度达到2,且导管内产生气体,与ATCC 43864结果相同。综上,3个品牌的VRBA、VRBA-MUG、LST和BGLB全部符合GB 4789.28—2013,推荐CMCC 48098和CICC22910用作验收4个培养基质控菌株的补充菌株。展开更多
文摘The fruits of Piper cubeba have been used in Ayurvedic system of medicine for pain,tastelessness, painful urination and mouth diseases. Among its various chemical constituents,(-)-hinokinin, a trypanosomicidal dibenzylbutyrolactone lignan, is found in significant quantities.For quality evaluation of P. cubeba fruit and its commercial formulations, there is an urgent need to develop an analytical method based on(-)-hinokinin. For this purpose, an HPLC method was developed using photo diode array detector and Waters HR C18 column with gradient elution consisting of water and acetonitrile. The developed method was validated as per ICH-Q2 B guidelines and found to be accurate, precise and linear over a wide range of concentrations(5–300 mg/m L).(-)-Hinokinin contents were found to be in the range of 0.005–0.109%(m/m) in various P. cubeba samples. The developed method was extended to LC–MS for further identification and characterization of(-)-hinokinin in samples. The developed method is simple,rapid and specific, and can be used as a tool for quality control of P. cubeba fruits and its commercial formulations.
文摘为保证原料乳质量,丰富检测原料乳中大肠菌群涉及到的培养基的验收质控菌株,采用GB 4789.28—2013《食品安全国家标准 食品微生物学检验 培养基和试剂的质量要求》中规定的验收方法,分别选取3个品牌的结晶紫中性红胆盐琼脂(violet red bile agar,VRBA)、结晶紫中性红胆盐-4-甲基伞形酮-β-D-葡萄糖苷琼脂(violet red bile agar with MUG,VRBA-MUG)、月桂基硫酸盐胰蛋白胨肉汤(lauryl tryptose broth,LST)和煌绿乳糖胆盐肉汤(brilliant green lactose bile broth,BGLB),对其进行外观、pH值、水分含量等物理指标以及生长率、选择性等微生物指标实验评价。同时以弗式柠檬酸杆菌ATCC 43864为参照,选取7株弗式柠檬酸杆菌对3个品牌的VRBA、VRBA-MUG、LST和BGLB进行验收实验评价。结果表明:3个品牌的不同培养基干粉颜色均正常,水分含量均控制在5%~6%,pH值均符合国家标准;7株弗氏柠檬酸杆菌在3个品牌VRBA、VRBA-MUG上的生长率均大于0.7;仅CMCC 48098和CICC 22910在3个品牌的LST、BGLB中浊度达到2,且导管内产生气体,与ATCC 43864结果相同。综上,3个品牌的VRBA、VRBA-MUG、LST和BGLB全部符合GB 4789.28—2013,推荐CMCC 48098和CICC22910用作验收4个培养基质控菌株的补充菌株。