Soxhlet extraction is a common technique for isolating piperine, the active compound in black pepper responsible for its pungency. The process involves using a Soxhlet apparatus to continuously extract piperine with a suitable solvent, resulting in a concentrated extract. This method is widely used in research and industry to obtain piperine for various applications, including pharmaceutical and flavoring purposes, allowing for the purified and concentrated form of this valuable compound to be readily available.