Phytochemistry and Preliminary Assessment of the Antibacterial Activity of Chloroform Extract of Amburana cearensis (Allemão) A.C. Sm. against Klebsiella pneumoniae Carbapenemase-Producing Strains

Table 1

Chemical composition of the chloroform extract of the stem bark of Amburana cearensis.

Compounds^a	Relative area (%)	RI^b	RI^c
Tricyclene	3.9	919	921
α-Pinene	1.0	931	932
β-Pinene	2.2	974	974
6,10-Dodecatrien-1-ol, 3,7,11-trimethyl	2.3^d	—	—
4-Methoxy-3-methylphenol	76.7^d	—	—
Terpinolene	0.3	1087	1088
1,3,8-p-Menthatriene	0.5	1107	1108
4-Hydroxybenzoic acid	3.1^d	—	—
Longifolene	1.7	1405	1407
cis-Muurolo-4(14),5-diene	3.2	1462	1465
Total	94.9	—	—

aCompounds are listed in order of their elution from a DB-5 column; ^bRI = retention indices relative to C₇–C₃₀  𝑛-alkanes; ^cRI = retention indices from the literature. ^dIdentified by direct comparison of the spectra with spectra stored in libraries of equipment as well as with the spectra and retention times of authentic compounds reported previously in the literature for comparison.