Polymorph Control of L-ArgHCl on Antisolvent Crystallization by Ultrasonic Irradiation

Yuki Ike, Izumi Hirasawa*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)


    Amino acids are utilized as medical raw materials and food additives. It is well-known that most of the amino acids show polymorphism. Differences in the crystal structures affect the physical and chemical properties. Therefore, an effective method for polymorph control is required in the crystallization process. Polymorph control of L-arginine hydrochloride (L-ArgHCl) on antisolvent crystallization was achieved by ultrasonic irradiation. L-ArgHCl exhibits polymorphism and crystallizes into three distinct crystal forms. Without irradiation, the metastable form was selectively crystallized. In contrast, the unstable form was selectively crystallized by irradiation. Irradiation after the addition of an antisolvent led to a shorter induction time.

    Original languageEnglish
    Pages (from-to)1318-1322
    Number of pages5
    JournalChemical Engineering and Technology
    Issue number7
    Publication statusPublished - 2017 Jul 1


    • Amino acids
    • Nucleation
    • Polymorphism
    • Sonocrystallization
    • Ultrasound

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering


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