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Reduction of surface tension of water in the presence of different products. A – Pure water, B-LBPF 1, C- LBPF 3, D- LBPF 7, E- LBPF 9, F- LBPF 10,G- LBPF 14, H- LBPF 15 and I- LBPF 9 obtained in glycerol. Those values express the S.D. out of three replicate experiments.
