The yield of garlic oleoresin microcapsules obtained through this method was 89.5% (with a wet juice content of 96.4%), and the encapsulation efficiency of the core material reached 97%. The microcapsules had a size range of 21.45 to 187.5 nm, with an average diameter of 107.2 nm. The water content was 7.12%, the active ingredient concentration was 0.4758%, and the residual alcohol level was 4.2 ml/L.
**Process Flow:**
Recirculating water → Solvent recovery → Deionized water
Garlic → Cleaning → Beating → Continuous Filtration → Storage Tank → Ingredient Emulsification → Homogenization → Spray Drying → Granulation → Metering & Packing
**Key Operational Points:**
a. **Production of Garlic Oleoresin:** Fresh garlic was processed in a DX-type high-speed tissue grinder. A 55% ethanol solution was used for extraction, followed by continuous filtration under vacuum conditions (40–45°C, 8.4–8.5 kPa) to recover the solvent. The resulting garlic oleoresin was yellow-brown and cloudy, with a strong pungent odor. Its pH was 5.95, moisture content was 85.57%, essential oil content was 0.298%, and active ingredient content was 0.4905%. Although the continuous filtration method yielded only 7.58% of oleoresin—about one-third less than the reflux method—it was preferred due to its lower thermal exposure during post-processing, which helps maintain the quality of the final product.
b. **Preparation of Ingredients:** The ratio of oleoresin to edible gum was 1:0.5–3.5. The edible gum was prepared using a combination of gum arabic and maltodextrin at a ratio of 0.5:3:9.5–7.0. Water was added to dissolve and mix the components thoroughly.
c. **Emulsification:** The mixture was stirred in a DX-J mixer at 10,000 rpm for 3 minutes to form a pre-emulsion. It was then passed through a JHG-type homogenizer at 20–40 MPa for 10–15 minutes to create a stable O/W emulsion.
d. **Spray Drying:** The emulsion was dried in a PGL-3 spray dryer under consistent drying conditions. This process typically achieved a solids content of over 99%, making it both efficient and cost-effective.
e. **Granulation and Final Product:** The dried microcapsule powder was introduced into the fluidized bed granulation chamber of the PGL-3 spray dryer. The particles were fluidized and sprayed with an emulsion to act as a binder, forming granular microcapsules that were then dried and packaged.
This method ensures high encapsulation efficiency, good stability, and excellent handling properties, making it ideal for industrial-scale production of garlic oleoresin microcapsules.
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