Which of the following unit operations and engineering barriers are essential to ensure commercial sterility in continuous Aseptic Packaging lines (e.g., Tetra Brik cartons)?
Options:
(A) Independent pre-sterilization of the liquid food product and the multi-laminate packaging material prior to filling
(B) Sterilization of packaging web using hot hydrogen peroxide ($H_2O_2, 30\text{--}35\%$) bath followed by squeegee rolls and sterile hot air drying
(C) Hermetic filling and ultrasonic/induction sealing conducted inside a sterile chamber maintained under positive pressure of HEPA-filtered sterile air
(D) Filling the package under open ambient factory atmosphere without sterilization of the air space
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
Aseptic packaging couples pre-sterilized food with pre-sterilized packaging (A) in a sterile cleanroom zone protected by positive HEPA overpressure (B) and sterile steam-jacketed equipment (C). Ambient open-air filling (D) leads to instant re-contamination.