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138 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGY Figure 6. Chromatographic peaks of black pepper essential oils orginated from Dak Lak province of Vietnam by GC-MS Table 1. Bioactive compounds of black pepper essential oils analyzed by GC-MS No. Retention time Substance Molecular Formula Molecular weight Dak Lak black pepper Area Composition, % 1 5.18 Pinene C10H16 136 6,332,179 5.44%
