Laboratory consumables are items that are used up during the course of laboratory work and are typically replaced frequently. These items are essential for conducting experiments, analyzing samples, and maintaining the functionality of the laboratory. They range from simple items like disposable pipettes, test tubes, and Petri dishes to more complex ones such as specialized reagents, filters, and diagnostic kits. These consumables are designed to support various scientific disciplines, including biology, chemistry, physics, and medical research.
The concept of laboratory consumables has evolved over time. In the early days of scientific research, basic glassware like beakers and flasks were among the first consumables. These were hand - blown and relatively simple in design. As scientific knowledge expanded, so did the need for more specialized consumables. With the development of manufacturing techniques, mass - produced glassware became more accessible. In the 20th century, the introduction of plastics revolutionized the field. Disposable plastic pipettes, test tubes, and Petri dishes became popular due to their cost - effectiveness, convenience, and reduced risk of cross - contamination. The development of new chemical and biological reagents also paralleled the growth of different scientific fields, enabling more complex experiments and analyses.
For Disposable Plasticware: The principle behind disposable plastic laboratory consumables lies in their design for single - use convenience. They are made from materials like polypropylene or polystyrene, which are inexpensive, lightweight, and easy to mold into various shapes. Their single - use nature reduces the risk of carry - over contaminants from previous uses, ensuring accurate experimental results.
For Reagents: Reagents are chemical substances used in experiments. Their principle of action depends on their chemical properties. For example, in a titration experiment, an acid - base indicator (a reagent) changes color based on the pH of the solution, allowing for the determination of the endpoint of the reaction. In a biological assay, enzyme - linked immunosorbent assay (ELISA) kits (reagents) use antibodies and antigens to detect the presence and quantity of specific proteins in a sample through a series of chemical reactions that produce a detectable signal.