Team:UCL/Project/Safety

KEEPING SAFE

It's Just Good Lab Practice

The health and safety considerations of the project is essential for the wellbeing of the project members and the laboratory environment in general. Some of the key considerations to be made involve handling bio-hazardous materials, process chemicals and mechanical operations; and the protocols that must be in place to prevent hazards from occurring, as well as appropriate plans of action in order to deal with any situation that may occur.

The Escherichia coli strain used is assumed to be non pathogenic, and thus not of considerable risk to the environment or team members. Although this is not seen directly as a major safety issue, there must still be a satisfactory level of Good Laboratory Practice (GLP) throughout the laboratory to minimise risk associated with performing experiments on a daily basis. As a minimum requirement, all members will wear some form of protective clothing, which generally consists of a lab coat and goggles, as well as single use gloves.

In terms of general disposal of used materials, the item should be isolated and sealed or placed in a container (usually bin bag) which prevents the item or chemical making physical contact with any of the facility. The material should then be removed from the room through the waste corridor and disposed of accordingly (chemical or steam treatment for example). Several emergency exits have also been implemented into the facility in case of a severe hazard breakout.

Continual monitoring and review of the safety of the facility is essential in order to maintain GLP and the condition of the plant. By undertaking continual assessments of laboratory safety, this will ensure that the risk of a hazard occurring in the plant is reduced. Training of team members in safe operation of machines, as well as general safety protocols is essential to reduce risk across the facility was mandatory; safety training and education in good laboratory practise was undertaken by all team members before experiments could begin.

The main principle behind performing experiments in a safe environment is to minimise risk. Risk is considered as the amalgamation of the potential damage that a hazard could cause, combined with the likelihood of said hazard occurring. The damage a hazard could cause is normally set by the equipment present in the laboratory, whilst laboratory team members can often decrease risk by decreasing the likelihood of a hazard occurring. Below the three main categories (Microbiological, Chemical and Mechanical) are defined with tables showing which hazard fall into said category, and how the risk is minimised in each case.

Microbiological Hazards

The key focus of microbiological hazard control concerns the Escherichia coli expression system being used. The majority of Escherichia coli strains are categorised into Bio-safety levels 1 or 2, with non-pathogenic strains placed into level 1 under World Health Organisation classifications. Therefore the Escherichia coli strain used in the facility is considered to be Bio-safety level one, which often requires less stringent safety standards. The genetically engineered strains also may require more safety regulation requirements than wild type micro-organisms; however advances in synthetic biology are allowing more control over the expression system in terms of pathogenicity and also the ability to express suicide genes, which can prevent any live Escherichia coli from surviving outside of the facility environment. Regardless, the facility must ensure and validate that all of the Escherichia coli is killed and effectively disposed of. Pressure systems and directed ventilation are in place to prevent escape of any strains, although this may lead to possible contaminants entering the halls, which dictates that the live Escherichia coli must be sealed in containers or vessels at all times where possible in order to prevent infection. The use of mammalian systems in the project also present a degree of hazard, although the associated risk is lower when compared to using bacteria.

Chemical Hazards

When performing experiments, it may be necessary to use dangerous chemicals during certain processes. Whilst using hazardous chemicals is avoided where necessary, in some cases it is required, so in each case where this occurs the procedure must be executed in a fashion which is as safe as reasonably possible. Therefore standard protocols such as wearing protective clothing may be added to by performing experiments in fume hoods or other such devices to minimise any chance of contact via evaporation etc.

Mechanical Hazards

For this project, mechanical hazards pose the lowest probability of occurring out of the three and thus may be considered as the lowest risk group. However, there are hazards present which must be minimised. The predominant issue here is the use of the desktop centrifuge system, which poses considerable danger if a blowout occurs.

Concluding Comments

The safety of the team members, produced material and environment are key aspects to the smooth running of the project, and it must be ensured that adequate measures are in place to provide protection whilst following guidelines outlined in safety training. Current Good Laboratory Practice must also be in place throughout experimental procedures. By following guidelines and acting in an appropriate manner whilst in the laboratory, the general risk in terms of micro-biological, chemical and mechanical aspects will be reduced to a level which is as low as reasonably possible.

Due to the relatively small scale of the experiments performed, the quantities used of material is small, but still must be handled and respected properly at all times. Proper containment and labelling of materials in sealed containers is necessary, especially when of particular hazard such as live material or Ethidium Bromide. Flammability concerns are also present with alcohol and other flammable materials stored in the lab, although the volumes (generally less than 2L) are not considerably large enough, although should still be treater properly when used, with fire extinguishers available and also emergency exits present if required. Protective clothing also should be worn where appropriate to minimise the possibility of skin contact, with wash and first aid station available in key areas where allowable due to the area classification.

The mechanical safety predominantly concerns the proper maintenance of the centrifuge system, which can cause a considerable risk if a failure occurs. Regular inspections should be made, with the centrifuge often restricted access when it was considered unfit for use. This room is also placed away from mammalian and bacterial processing centres. Prevention methods should also be in place such as emergency shut-off procedures.

By following all legislation and GLP requirements, the project may be performed in a safe and effective manner. Continual training and inspection of the facility will aid in ensuring safety levels are maintained, with review protocols in place to investigate any faults. Team members have been trained in general safety, with supervisors having first aid experience and training. These considerations combined will ensure the safety risk to the personnel; product and environment is as low as reasonably possible. For further reading, the Institute of Chemical Engineering (IChemE) has relevant information, as well as other safety guidance documents relating to the relevant country where the university is located.