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Use of Dairy Industry Side-Stream Lactose for Tablet Manufacturing − Proof of Concept Study

Anssi-Pekka Karttunen, Atte Junnila, Eetu Myöhänen, Elina Harju, Chee Xuan, İrem Namlı Okuyucu,Juho Heininen, Satu Kivimäki, Vilhelmiina Harju, Maarit Julkunen, Päivi Vähäjärvi,Kirsi S. Mikkonen,Teemu Tomberg,Ulla Moilanen, Clare J. Strachan,Jaakko Teppo,Marika Tossavainen,Leena Peltonen

International Journal of Pharmaceutics(2024)

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Abstract
During recent years there have been shortages of certain drugs due to problems in raw material supply. These are often related to active ingredients but could also affect excipients. Lactose is one of the most used excipients in tableting and comes in two anomeric and several solid-state forms. The aim of this study was to utilize lactose from a dairy side-stream and compare it against a commercial reference in direct compression. This would be a sustainable option and would secure domestic availability during crises. Two types of lactose, spray-dried and freeze-dried, were evaluated. Lactose was mixed with microcrystalline cellulose in different ratios together with lubricant and glidant, and flowability and tabletability of the formulations was characterized. The fully amorphous and small particle-sized spray-dried lactose flowed inadequately but exhibited good tabletability. The larger particle-sized, freeze-dried lactose exhibited sufficient flow and better tabletability than the commercial reference. However, disintegration and drug release were slower when using the investigational lactose formulations. This was most likely due to remaining milk proteins, especially caseins, in the lactose. Overall, the investigational lactose provides promise for the use of such a side-stream product during crisis situations but enhancing their properties and/or purity would be needed.
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Key words
Direct compression,Lactose,Sustainability,Solid state,Supply chain
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