Saturday, September 25, 2021

Seed oil extraction: Cold Press method

Seed oil can be extracted from the seeds using various techniques such as cold pressing and solvent, supercritical carbon dioxide, and ultrasound-assisted aqueous enzymatic extraction.

Cold press oils can be defined as oils obtained only by mechanical means which are suitable for direct consumption and without heat treatment. In other words, cold pressed oil is generally ready for consumption without needing to be refined, high-quality oil.

Cold pressed method is mainly used for extracting essential oils from plants, flower, seeds, lemon, tangerine oils. Among the seeds extracted for oil: sunflower seed, canola seed, soybeans, sesame seed, ground nuts, poppyseed, linseed, flaxseed, peanut, mustard seed and cotton seed.

Cold press extraction is one of the methods of mechanical extraction as well as required less energy than other oil extraction techniques and also environmentally friendly.

Cold-pressed oils are obtained mechanically using either a hydraulic or screw press without the application of heat, solvents, or chemical treatments, which makes the process environmentally friendly and the extracted oil safer for human consumption.

Pre-treatment and process parameters applied to the raw material in the cold pressing method play a major role in terms of oil yield. The pre-processes mentioned may be peeling, drying, solvent or enzymatic treatment of raw material; the process parameters are feeding rate, the diameter of the restriction dye, temperature, cold rotation speed.

Cold press machine has one inlet that seeds were feed and two exits that obtained oil and a non-oiled cake was exit.

The cold pressing process does not need an external substance as with other methods. The seeds are crushed and pressed in order to force the oil out. The oil then was purified by settling, filtering, and centrifuging only.

Cold-pressed seed oils have great dietary value, specific sensory properties, health-beneficial factors and significant chemical properties because neither heat treatment nor any organic solvent were used to obtain oil from the raw material. Thus, natural antioxidants and beneficial phytochemicals such as tocopherols, fatty acids, sterols and antioxidant phenolic compounds are protected at higher levels in cold pressed oils.

The retention of antioxidant compounds may provide cold-pressed oils with acceptable oxidative stability and better health properties. Cold presses can be classified as expellers, expanders and twin-cold systems.
Seed oil extraction: Cold Press method

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