Systematic Approach for the Formulation and Optimization of Solid Lipid Nanoparticles of Efavirenz by High Pressure Homogenization Using Design of Experiments for Brain Targeting and Enhanced Bioavailability

Table 2

Major peaks observed in the IR spectrum of efavirenz recorded using FT-IR spectrophotometer (Bruker Alpha-One, Bruker Optik, Germany).

Observed (cm^−1)	Reported (cm^−1)	Inference
3319.64	3500–3100	N-H stretching
2249.39	2250–2100	C≡C (alkyne)
1750.06	1750–1730	C=O of ester
1602.59	1680–1630	C=O of amide
1498.33	1350–1000	C-N
1036.16	1300–1000	C-O