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The above results resume the effect of the aliphatic chain of the stationary phase on the separation of 6 compounds using RPLC columne packed withi S-pan particles. Mobile gliase sos mijimin. The compound 1 is polar and the compound 6 is non polar. When the aliphatic chain increases, the retention time decreases and the resolution decreases The compound 1 is polar and the compound 6 is non polar. When the aliphatic chain increases, the retention time increases and the resolation increases The compound 1 is non polar and the compound 6 is polar. When the aliphatic chain increases, the retention time decreases and the resolution decreases The compound 1 is non polar and the compound 6 is polar. When the aliphatic chain increases, the retention time increases and the reolution increases