HD	hydrodistillation without pretreatment (no-pretreatment control)
HDW–RE	hydrodistillation with reflux extraction pretreatment in water (no-enzyme control)
HDW–REP	hydrodistillation with reflux extraction pretreatment assisted by pectinase enzymes in purified water
HDW–REC	hydrodistillation with reflux extraction pretreatment assisted by cellulase enzymes in purified water
HDW–REX	hydrodistillation with reflux extraction pretreatment assisted by xylanase enzymes in purified water
HDW–REPCX	hydrodistillation with reflux extraction pretreatment assisted by pectinase/cellulase/xylanase enzymes in purified water
HDB–RE	hydrodistillation with reflux extraction pretreatment in citrate buffer (no-enzyme control)
HDB–REP	hydrodistillation with reflux extraction pretreatment assisted by pectinase enzymes in citrate buffer
HDB–REC	hydrodistillation with reflux extraction pretreatment assisted by cellulase enzymes in citrate buffer
HDB–REX	hydrodistillation with reflux extraction pretreatment assisted by xylanase enzymes in citrate buffer
HDB–REPCX	hydrodistillation with reflux extraction pretreatment assisted by pectinase/cellulase/xylanase enzymes in citrate buffer