title: Real time stability and viability prediction of the anticancer BCG after lyophilization.
abstract: To test if trehalose could be a better cryoprotectant for BCG than the usually used lactose and predict viability of BCG during shelf-life, BCG was suspended into three stabilizer systems containing 15% w/v trehalose, trehalose-gelatin mixture (in ratio, 30:1 w/w) or lactose. Each formula was lyophilized and several quality parameters were tested before and after lyophilization including sterility, safety, viability, morphology and moisture content. Samples of lyophilized formulae were tested for their reconstitution time and others were charged to stability chambers at 5°C for the performance of real time study. Shelf-life of each formula was estimated and correlation between moisture content and loss in viability was established at each time interval of the real time stability study. Sterility, safety and morphology were retained after lyophilization. Just after lyophilization, minute diminish in viability was observed in the presence of each stabilizer (0.02-0.05%). There was no significant difference in reconstitution time of the three lyophilized formulae. Lactose BCG had the highest shelf-life among the used cryoprotectants during the real time stability studies. Also, moisture content was highly correlated to viability with correlation coefficient ranged between 0.97 and 0.99 and so, the former could be used for prediction of viability throughout the vaccine shelf-life.
authors: a Applied Research Sector , VACSERA , Cairo , Egypt .
authors: Dalia
authors: D
authors: Mohamed
authors: b Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy , Cairo University , Cairo , Egypt , and.|c College of Pharmacy , Gulf Medical University , Ajman , UAE.
authors: Ibrahim
authors: I
authors: Elsayed
authors: a Applied Research Sector , VACSERA , Cairo , Egypt .
authors: Aly Fahmy
authors: AF
authors: Mohamed
authors: b Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy , Cairo University , Cairo , Egypt , and.
authors: Soad Ali
authors: SA
authors: Yehia
mesh_terms: D000818:Animals; D001500:BCG Vaccine / Q000008:administration & dosage* / Q000737:chemistry; D002626:Chemistry, Pharmaceutical / Q000379:methods; D003451:Cryoprotective Agents / Q000737:chemistry; D004339:Drug Compounding; D004355:Drug Stability; D004356:Drug Storage; D005079:Excipients / Q000737:chemistry*; D005612:Freeze Drying; D005780:Gelatin / Q000737:chemistry; D006168:Guinea Pigs; D007785:Lactose / Q000737:chemistry*; D008297:Male; D013997:Time Factors; D014199:Trehalose / Q000737:chemistry*
chemical_list: D001500:BCG Vaccine; D003451:Cryoprotective Agents; D005079:Excipients; D005780:Gelatin; D014199:Trehalose; D007785:Lactose
keywords: BCG; lyophilization; moisture content; prediction; trehalose