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supercritical carbon dioxide sterilization

Yongsheng Dong, Hua Jiang
High environmental pressure exerts an external stress on the survival of microorganisms that are commonly found under normal pressure. In response, many growth traits alter, including cell morphology and physiology, cellular structure, metabolism, physical and chemical properties, the reproductive process, and defense mechanisms. The high-pressure technology (HP) has been industrially utilized in pressurized sterilization, synthesis of stress-induced products, and microbial/enzymatic transformation of chemicals...
November 2016: World Journal of Microbiology & Biotechnology
Jenna L Balestrini, Angela Liu, Ashley L Gard, Janet Huie, Kelly M S Blatt, Jonas Schwan, Liping Zhao, Tom J Broekelmann, Robert P Mecham, Elise C Wilcox, Laura E Niklason
Lung engineering is a potential alternative to transplantation for patients with end-stage pulmonary failure. Two challenges critical to the successful development of an engineered lung developed from a decellularized scaffold include (i) the suppression of resident infectious bioburden in the lung matrix, and (ii) the ability to sterilize decellularized tissues while preserving the essential biological and mechanical features intact. To date, the majority of lungs are sterilized using high concentrations of peracetic acid (PAA) resulting in extracellular matrix (ECM) depletion...
March 2016: Tissue Engineering. Part C, Methods
Hyong Seok Park, Jungwoo Yang, Hee Jung Choi, Kyoung Heon Kim
Present sterilization methods for biofilms in medical devices have limitations. Therefore, an alternative sterilization method using supercritical carbon dioxide (SC-CO2) was tested on Candida albicans biofilms. The effect of varying pressure, temperature, and treatment time on the inactivation of C. albicans spores in suspensions and in biofilms was examined. The parameters such as treatment time, pressure, and temperature that led to the complete inactivation of C. albicans biofilms ranged 5-20 min, 100-200 bar, and 35-45 °C, respectively...
September 2015: Bioprocess and Biosystems Engineering
Anne Bernhardt, Markus Wehrl, Birgit Paul, Thomas Hochmuth, Matthias Schumacher, Kathleen Schütz, Michael Gelinsky
The development of bio-resorbable implant materials is rapidly going on. Sterilization of those materials is inevitable to assure the hygienic requirements for critical medical devices according to the medical device directive (MDD, 93/42/EG). Biopolymer-containing biomaterials are often highly sensitive towards classical sterilization procedures like steam, ethylene oxide treatment or gamma irradiation. Supercritical CO₂ (scCO₂) treatment is a promising strategy for the terminal sterilization of sensitive biomaterials at low temperature...
2015: PloS One
Jennifer L Wehmeyer, Shanmugasundaram Natesan, Robert J Christy
Numerous techniques have been reported for preparing and sterilizing amniotic membrane (AM) for use in clinical applications. However, these preparations either do not produce completely sterile tissue or are detrimental to molecules unique to the tissue matrix, thus compromising beneficial wound-healing properties of the AM graft. The objective of this work was to produce a sterile human AM tissue graft using a novel preparation technique involving supercritical carbon dioxide (SCCO2). AM tissue was subjected to various sterilization treatment groups that optimized the duration of exposure to SCCO2 and the amount of peracetic acid (PAA) required to achieve a sterility assurance level of 10(-6) log reduction in bacterial load...
July 2015: Tissue Engineering. Part C, Methods
Nicholas Russell, Alain Rives, Matthew H Pelletier, Tian Wang, William R Walsh
Bone allografts are used to replace bone that has been removed or to augment bone tissue in a number of clinical scenarios. In order to minimize the risk of infection and immune response, the bone is delipidated and terminally sterilized prior to implantation. The optimal method for bone graft sterilization has been the topic of considerable research and debate. Recently, supercritical carbon dioxide (SCCO(2)) treatments have been shown to terminally sterilize bone against a range of bacteria and viruses. This study aimed to evaluate the effect of these SCCO(2) treatments on the anisotropic mechanical properties of cortical bone...
March 2015: Cell and Tissue Banking
Nick Russell, Alain Rives, Nicky Bertollo, Matthew Henry Pelletier, William Robert Walsh
The optimal sterilization method for load bearing allografts remains a clinical concern. Recently, supercritical carbon dioxide (SCCO2) treatments have been shown to be capable of terminally sterilizing a range of bacteria and viruses, while preserving the static mechanical properties of cortical bone. This study evaluated the effect of SCCO2 treatment compared with two doses of gamma irradiation, on clinically relevant dynamic mechanical properties of cortical bone. Quasi-static testing was also performed to compare the impairment of treatment...
June 21, 2013: Journal of Biomechanics
Franca Zani, Cristina Veneziani, Elena Bazzoni, Loretta Maggi, Giovanni Caponetti, Ruggero Bettini
Glucocorticosteroids, a class of drugs widely used in the treatment of allergies, airways inflammation and inflammatory ocular diseases, are often difficult to sterilize due to their inherent sensibility to heat or irradiation induced degradation. Being often in form of suspension, obviously the final medicinal product cannot be sterilized by filtration. The effectiveness of supercritical CO2 (SC-CO2) based method for the sterilization of food and biomedical materials is well documented in the literature. Few reports are available on the sterilization of drugs especially in powder form with SC-CO2...
June 25, 2013: International Journal of Pharmaceutics
Nicholas A Russell, Alain Rives, Matthew H Pelletier, Warwick J Bruce, William R Walsh
Load bearing bone allografts are used to replace the mechanical function of bone that has been removed or to augment bone that has been damaged in trauma. In order to minimize the risk of infection and immune response, the bone is delipidated and terminally sterilized prior to implantation. The optimal method for bone graft sterilization has been the topic of considerable research. Recently, supercritical carbon dioxide (SCCO(2)) treatments have been shown to terminally sterilize bone against a range of bacteria and viruses...
June 2013: Cell and Tissue Banking
Jahna Howell, Fengui Niu, Shannon E McCabe, Wei Zhou, Charles J Decedue
A process is described using supercritical carbon dioxide to extract organic solvents from drug solutions contained in 30-mL serum vials. We report drying times of less than 1 h with quantitative recovery of sterile drug. A six-log reduction of three spore types used as biological indicators is achieved with direct addition of peracetic acid to a final concentration of approximately 5 mM (~0.04 %) to the drug solution in the vial. Analysis of two drugs, acetaminophen and paclitaxel, indicated no drug degradation as a result of the treatment...
June 2012: AAPS PharmSciTech
Ivan Donati, Monica Benincasa, Marie-Pierre Foulc, Gianluca Turco, Mila Toppazzini, Dario Solinas, Sara Spilimbergo, Ireneo Kikic, Sergio Paoletti
The development of biomaterials endowed with bioactive features relies on a simultaneous insight into a proper terminal sterilization process. FDA recommendations on sterility of biomaterials are very strict: a sterility assurance level (SAL) of 10(-6) must be guaranteed for biomaterials to be used in human implants. In the present work, we have explored the potential of supercritical CO(2) (scCO(2)) in the presence of H(2)O(2) as a low-temperature sterilization process for thermoset materials and their bioactive surfaces...
April 9, 2012: Biomacromolecules
Hyong Seok Park, Hee Jung Choi, Kyoung Heon Kim
Supercritical carbon dioxide (SC-CO(2)) was used to inactivate fungal spores of Alternaria brassicicola. The inactivation conditions were optimized using response surface methodology (RSM). When the SC-CO(2)-entrainer (ethanol) system was applied to fungal spores, the treatment time required for the complete inactivation of fungal spores was substantially reduced.
January 2012: Journal of Microbiological Methods
Aleksandra Checinska, Ingrid A Fruth, Tonia L Green, Ronald L Crawford, Andrzej J Paszczynski
Novel noninvasive techniques for the removal of biological contaminants to generate clean or sterile materials are in demand by the medical, pharmaceutical and food industries. The sterilization method described here uses supercritical fluid carbon dioxide (SF-CO(2)) containing 3.3% water and 0.1% hydrogen peroxide (v/v/v) to achieve from four to eight log viability reduction of all tested microbial species, including vegetative cells, spores and biofilms. The sterilization method employs moderate pressure and temperature (80 atm, 50°C) and a short (30-minute) treatment time...
October 2011: Journal of Microbiological Methods
J J Schwiedrzik, K-H Kaudela, U Burner, P K Zysset
Tissue grafts are implanted in orthopedic surgery every day. In order to minimize infection risk, bone allografts are often delipidated with supercritical CO₂ and sterilized prior to implantation. This treatment may, however, impair the mechanical behavior of the bone graft tissue. The goal of this study was to determine clinically relevant mechanical properties of treated/sterilized human trabecular bone grafts, e.g. the apparent modulus, strength, and the ability to absorb energy during compaction. They were compared with results of identical experiments performed previously on untreated/fresh frozen human trabecular bone from the same anatomical site (Charlebois, 2008)...
June 1, 2011: Bone
Md Sohrab Hossain, Amutha Santhanam, N A Nik Norulaini, A K Mohd Omar
The management of clinical solid waste (CSW) continues to be a major challenge, particularly, in most healthcare facilities of the developing world. Poor conduct and inappropriate disposal methods exercised during handling and disposal of CSW is increasing significant health hazards and environmental pollution due to the infectious nature of the waste. This article summarises a literature review into existing CSW management practices in the healthcare centers. The information gathered in this paper has been derived from the desk study of open literature survey...
April 2011: Waste Management
Sungmin Mun, Ji-Sook Hahn, Youn-Woo Lee, Jeyong Yoon
Interest is growing for a non-thermal sterilization technique in the food and pharmaceutical industries in order to ensure microbiological safety without the deterioration of product quality. In this study, supercritical nitrous oxide (SC N₂O) treatment was carried out in a multi-batch system to examine its bactericidal effect and characteristics, which largely remains unclear. The effect of operating pressure, temperature, mixing intensity, and working volume ratio (defined as the ratio of sample volume to the reactor volume to be filled with SC fluids) on the inactivation efficiency of SC N₂O were investigated in comparison with supercritical carbon dioxide (SC CO₂) treatment...
January 5, 2011: International Journal of Food Microbiology
Claudio Cinquemani
Implantable polymers, as used for biomedical applications, inherently have to be sterile. Nonetheless, most implants, particularly those comprised of biomaterials developed in recent years for tissue engineering, are heat sensitive. Therefore, use of hazardous (radio)chemicals--due to lack of alternative methods--is still state of the art for sterilization processes. The drawbacks of these techniques, both drastic and well known, lead to the demand for an alternative sterilization method, which is equally obvious and urgent...
January 2011: Journal of Industrial Microbiology & Biotechnology
Falk Liebner, Emmerich Haimer, Martin Wendland, Marie-Alexandra Neouze, Kerstin Schlufter, Peter Miethe, Thomas Heinze, Antje Potthast, Thomas Rosenau
Bacterial cellulose produced by the gram-negative bacterium Gluconacetobacter xylinum was found to be an excellent native starting material for preparing shaped ultra-lightweight cellulose aerogels. The procedure comprises thorough washing and sterilization of the aquogel, quantitative solvent exchange and subsequent drying with supercritical carbon dioxide at 40 degrees C and 100 bar. The average density of the obtained dry cellulose aerogels is only about 8 mg x cm(-3) which is comparable to the most lightweight silica aerogels and distinctly lower than all values for cellulosic aerogels obtained from plant cellulose so far...
April 8, 2010: Macromolecular Bioscience
Csaba D András, Csaba Csajági, Csongor K Orbán, Csilla Albert, Beáta Abrahám, Ildikó Miklóssy
Supercritical carbon dioxide (CO(2)) possesses germicide (bactericide and sporicide) effect. Despite of the fact, that this effect is used in industrial sterilization processes, the sterilization mechanism at molecular level is unclear. Our hypotheses can provide a molecular-biological explanation for the phenomenon. We believe that in supercritical state CO(2) reacts competitively with Met-tRNA(fMet), the formation rate and the amount of formyl-methionyl-tRNA (fMet-tRNA(fMet)) will be diminished by irreversible substrate consumption...
February 2010: Medical Hypotheses
Soo Rin Kim, Hee Taek Kim, Hee Jung Park, Sooah Kim, Hee Jung Choi, Geum-Sook Hwang, Jong Hoon Yi, Do Hyun Ryu, Kyoung Heon Kim
Non-thermal sterilization and microbial inactivation processes are currently receiving much attention in food and pharmaceutical industries. In particular, since supercritical carbon dioxide (SC-CO2) treatment, which is conducted at relatively low temperatures, is considered to be a promising alternative method to replace thermal sterilization processes that cannot be safely used in foods and bioactive materials. Although SC-CO2 has been applied to many microorganisms, the inactivation of microbial cells by SC-CO2 has only been evaluated by using a conventional viable cell count such as a plating method, by which it is not possible to systematically elucidate the microbial cell inactivation process...
September 15, 2009: International Journal of Food Microbiology
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