Tablets and some equations for determination of forces affecting tablet compaction

Yıl 2015, Cilt: 5 Sayı: 3, 204 - 210, 01.10.2015

Mekin Doğa Halaçoğlu Timuçin Uğurlu

Öz

Tablet is the most common pharmaceutical dosage form in drug industry. It is classified as a solid dosage form. Due to its advantage, it is widely produced and used. Excipient type and level are very important for tablet formulation. Presence of a lubricant in a tablet formulation is necessary for production. Lubricants determine the specification of the final product and improve tablet performance. Lubricants also show glidant effects. During tablet production, the frictional forces between the compression machine components must be reduced with the use of an ideal lubricant. By adding a lubricant to the formulation, a layer is built around each powder particle which causes lesser tablet deformation. The effect of the lubricants on tablet’s mechanical property is related to their binding mechanism. The principle of tablet press instrumentation is to measure the forces on the dies and those transferred from the dies to other components of the press. Lubricant activity of the excipients can be evaluated using the formulated data that include tensile strength, cohesion index, lubricant effectiveness and transmission ratio.

Anahtar Kelimeler

Tablet, lubricant, tablet press instrumentation, lubricant effectiveness, cohesion index

Tabletler ve tablet basımına etki eden kuvvetlerin belirlenmesinde kullanılabilecek bazı yeni eşitlikler

Öz

Tabletler ilaç endüstrisinde en çok kullanılan farmasötik dozaj şekilleridir. Katı dozaj şekilleri sınıfına girerler. Yaygın olarak üretilmesi ve kullanılması avantajlarından dolayıdır. Uygun bir yardımcı madde ve bu yardımcı maddelerin formülasyon içindeki seviyelerinin seçimi başarılı bir üretim için çok önemlidir. Tablet formülasyonu için gerekli olan yardımcı madde sınıflarından biri ise kaydırıcılardır. Son ürünün spesifikasyonlarının belirlenmesi ve basım performansının iyileştirmesi nedeniyle oldukça önemli yardımcı maddelerdir. Kaydırıcılar lubrikant ve glidant özelliklerde olmalıdır. İdeal bir kaydırıcı toz ve tablet basım makinasının tüm aksamları arasındaki sürtünme kuvvetini azaltma yeteneğine sahip olmalıdır. Kaydırıcılar, formülasyona ilave edildiklerinde, toz partikülleri etrafında tabaka oluşturmaktadır. Bu tabaka tabletlerin daha az deformasyona uğramasına neden olmaktadır. Lubrikantların tabletin mekanik özellikleri üzerine etkisi bağlanma mekanizması ile yakından ilgilidir. Tablet basım kuvvetini ölçmek amacıyla tablet presleri, zımba üzerinde oluşan kuvvetin, tablet presinin diğer aksamlarına aktarılması prensibi göz önünde bulundurularak enstrümante edilirler. Tablet basım makinası enstrümantasyonu sonrasında gerilme kuvveti, kohezyon indeksi, lubrikant etkinliği ve iletim oranı gibi verilerle lubrikant etkinliği değerlendirilir.

Anahtar Kelimeler

Tablet, lubrikant, tablet basım makinası enstrümantasyonu, lubrikant etkinliği, kohezyon indeks

Kaynakça

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