Different parameters applied in the hydrodistillation of an essential oil not only influence the percentage yield of the oil but also the concentration of each of its constituents. In the present study the simultaneous influence of three parameters, i.e. degree of comminution, distillation period and distillation rate, on the composition of sweet fennel oil was investigated, using the Latin square method for the experimental programme. The percentage composition of the oil samples was determined by GLC. The results showed for each oil constituent the optimum combination of the parameters studied. The degree of comminution influenced the oil composition to a much larger extent than the other two parameters.
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Stavros T. Katsiotis (1989) studied this question.
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