Antibacterial and Antibiotic-Modifying Activity of Methanol Extracts from Six Cameroonian Food Plants against Multidrug-Resistant Enteric Bacteria

Table 2

Extraction yields, aspects, and phytochemical composition of the plant extracts.

Extracts	Psidium guajava			Persea americana		Citrus sinensis	Coula edulis	Mangifera indica		Camellia sinensis
Parts used	Leaves	Bark	Fruits	Leaves	Bark	Peel	Fruits	Leaves	Bark	Leaves
(%)	5.47	4.17	6.12	5.15	4.47	6.56	7.25	5.36	4.26	5.8
Alkaloids	+	+	−	+	+	+	+	+	+	+
Polyphenols	+	+	+	+	+	+	+	+	+	+
Flavonoids	+	+	+	+	+	+	+	+	+	+
Anthraquinones	−	−	−	+	+	−	+	+	+	−
Coumarins	+	+	+	+	+	+	+	+	+	−
Tannins	+	+	−	+	+	+	+	+	+	+
Triterpenes	+	+	+	+	+	+	+	+	+	+
Sterols	+	+	+	+	+	+	+	+	+	+
Saponins	+	+	−	+	+	+	+	+	+	+

−: absent; +: present; yield calculated as the ratio of the mass of the obtained methanol extract/mass of the plant powder.