Lab on paper, a miniaturized device in analytical chemistry, has contributed a lot to the development of analytical methods. In the past, this device did not receive much attention, but its positive characteristics, such as simplicity, low price, portability, and environmental friendliness, have put it at the forefront. Paper, the main element of lab on paper, is a thin, light, and adjustable material, made from cellulose fibres. The transfer of liquids through paper is based on microfluidics. Since capillary forces are characteristic of paper, no additional source of energy is required to move liquids. This paper was made by studying articles, in which lab on paper is used not only as a substitute for traditional methods, but also as a portable analytical device. However, lab on paper is not reliable enough to entirely replace most frequently used methods. The problem is associated with the high number of falsely positive and falsely negative results, which researchers try to reduce as much as possible through extensive further research.
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