This is your opportunity to convince readers that you clearly know why your work is useful. A good introduction should answer the following questions:
-What is the problem to be solved?
-Are there any existing solutions?
-Which is the best?
-What is its main limitation?
-What do you hope to achieve?
Editors like to see that you have provided a perspective consistent with the nature of the journal. You need to introduce the main scientific publications on which your work is based, citing a couple of original and important works, including recent review articles.
Here are some additional tips for the introduction:
-Never use more words than necessary (be concise and to-the-point). Don't make this section into a history lesson. Long introductions put readers off.
-We all know that you are keen to present your new data. But do not forget that you need to give the whole picture at first.
-The introduction must be organized from the global to the particular point of view, guiding the readers to your objectives when writing this paper.
-State the purpose of the paper and research strategy adopted to answer the question, but do not mix introduction with results, discussion and conclusion.
-Hypothesis and objectives must be clearly remarked at the end of the introduction.