Abstract
As an important pharmaceutical process, crystallization greatly impacts the final product.
In recent years, the continuous crystallization process has attracted more attention from researchers,
with the promotion of continuous manufacturing (CM) by the Food and Drug Administration
(FDA). The continuous crystallization process has the advantages of high economic benefit, stable
and uniform quality, a short production cycle, and personalization. To carry out continuous crystallization,
some related process analytical technology (PAT) tools have become the focus of breakthroughs.
Infrared (IR) spectroscopy, Raman spectroscopy, and focused beam reflection measurement
(FBRM) tools have gradually become research hotspots due to their fast, non-destructive, and
real-time monitoring characteristics. This review compared the advantages and disadvantages of the
three technologies. Their applications in the upstream mixed continuous crystallization process, the
middle reaches of crystal nucleation and growth, and the process of the downstream refining were
discussed to provide corresponding guidance for the practice and further development of these three
technologies in the continuous crystallization process and promote the development of CM in the
pharmaceutical industry.
Keywords:
Continuous crystallization, Process analytical technology, Infrared spectroscopy, Raman spectroscopy, Focused beam reflection measurement, Continuous manufacturing.
Graphical Abstract
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