Table 1. Spices and herbs used for the study and yield of their essential oils.

Scientific Name	Common Name	Family	Parts used	Yields of essential oils (%)
Allium cepa	Onion	Allium	bulb	0.19
Allium sativum	Garlic	Allium	bulb	0.30
Brassica nigra	Mustard	Brassicaceae	seed	0.54
Coriandrum sativum	Coriander	Apiaceae	leaf	0.42
Coriandrum sativum	Coriander	Apiaceae	seed	0.73
Cuminum cyminum	Cumin	Apiaceae	seed	0.67
Curcuma longa	Turmeric	Zingiberceae	rhizome	0.37
Laurus nobilis	Bay leaf	Lauraceae	leaf	0.20
Piper nigrum	Black pepper	Piperaceae	seed	0.39
Zingiber officinale	Ginger	Zingiberaceae	rhizome	0.40