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Encapsulation is used to protect substances or control their delivery. In the encapsulation process, a target substance is coated in a protective but permeable layer. It is even possible to encapsulate living materials such as cells. Microencapsulation can deliver capsules on a microscopic scale and has numerous life sciences, medicine, and food production applications.

There are various encapsulation methods. Classic procedures are pan coating encapsulation or encapsulation via centrifugation. More controllable results are obtained by spray drying using a vibrational nozzle. In this method, controlled vibrations are applied to a laminar flow through a nozzle, which generates even-size capsules and allows various coatings.

BUCHI encapsulation applications


Solid-Liquid Extraction

There are various methods for solid-liquid extraction. For many applications, the most elegant and efficient is Soxhlet-Extraction. It allows for the continuous extraction of a sample by ongoing distillation of the solvent. For this, the solid sample is placed into a thimble above the solvent. The solvent is evaporated and then condensed again in a condenser above the thimble. It flows down into the thimble, where the extraction takes place. Once the thimble is full, the extract is siphoned back into the solvent container. The solid sample can gently and continuously be extracted with fresh solvent. The entire process can be fully automated with BUCHI's range of extraction instruments.

BUCHI extraction applications


Melting Point Determination

Melting Point determination is one of the oldest methods used, primarily, to analyze the purity of a substance. It remains one of the most simple checks for purity even today. Based on the fact that every chemically pure (solid) substance has a well-defined melting temperature. The less pure a substance is, the more the melting temperature is lowered.

Melting point determination is straightforward: A sample is heated slowly, and the sample temperature is observed. However, this process is very time-consuming; therefore, BUCHI has entirely automated the process with dedicated melting point instruments. They offer visual inspection of the process and specific methods/programs for various substances. It is also possible to record the critical phase transition for subsequent analysis.

BUCHI melting point applications