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The Sterilization of Herbs and Herb Powder

The Sterilization of Herbs and Herb Powder

Abstract: Native Chinese herb medicine increases the detection in the new GMP standard microorganism project, restrict demand has increased for the traditional Chinese medicines, however, applicable sterilization method is also different, through several decades of efforts and expirences, the domestic major pharmaceutical companies has summarized the difference of disinfection sterilization methods, and propose reasonable scientific sterilization method for different sterilization load.
Sterilization of original powder of Traditional Chinese medicine herb refers to the method of killing or removing live pathogenic bacteria and microorganisms in original powder of traditional Chinese medicine and decoction pieces of Traditional Chinese medicine by appropriate physical or chemical means.In daily production, the operation of sterilization method should be monitored to ensure that key parameters (such as temperature, pressure, time, humidity, sterilizer ratio, sterilization gas concentration, etc.) are within the verified range. In addition, the sterilization method should be periodically retested. Due to the characteristics of Chinese medicinal materials, such as variety, complex nature and large difference in microbial content, when selecting sterilization methods, flexible selection and comprehensive utilization should be carried out according to the advantages and disadvantages of different sterilization methods.

The Sterilization of Herbs and Herb Powder

1. Steam Streilization

Steam sterilization method refers to the method of killing bacteria by putting the original powder of Traditional Chinese medicine or decoction pieces of Traditional Chinese medicine into a sterilization cabinet and denaturating and solidifying the protein components in bacterial protoplasm with high pressure saturated steam. This method is one of the most effective and widely used sterilization methods in thermal sterilization. Wet heat sterilization conditions are usually “121’C, 15minutes” or “116°C, 40minutes”, other temperature and time parameters suitable for the product can also be used.When using steam sterilization, the sterilized traditional Chinese medicine powder or Chinese medicine yinpian should be properly loaded to ensure the effectiveness and consistency of sterilization.

2. Ozone Sterilization

Ozone elimination method is used to kill microorganisms in traditional Chinese medicine original powder or Chinese medicine decoction pieces by countercurrent contact with suspended ozone, which is carried out in a sterilization room filled with sterilization gas. Ozone sterilization conditions: ozone concentration 54g/m3, quenching time 40min, airflow speed 40Hz (frequency converter), oxygen purity > 85%, sterilization temperature W40°C, other suitable sterilization parameters for this variety can also be used. This method is suitable for the sterilization of primary drug powder which is stable in ozone. It has no harmful residue and will not harm the operator and the environment.

3. Dry Heat Sterilization

Dry heat sterilization method refers to the method of killing microorganisms with dry hot air by placing the original powder of Traditional Chinese medicine or decoction pieces of Traditional Chinese medicine in a dry heat sterilization cabinet (such as the tunnel drying, disinfection and sterilization machine of Bycotri). This method is suitable for the sterilization of primary medicine powder which is resistant to high temperature but not suitable for damp heat sterilization. Dry heat sterilization conditions are generally “115C, 90min”, other temperature and time parameters suitable for the variety can also be used. When using dry heat sterilization, the sterilized powder should be properly loaded to ensure the effectiveness of sterilization.

4. Microwave Drying and Sterilization

Microwave drying method is based on the principle of traditional Chinese medicine original powder or Chinese medicine decoction pieces being heated in high frequency electromagnetic field. Water can strongly absorb microwave, so that the polar molecule rotation, due to the friction between molecules and heat, heat is generated in the heated material, After microwave treatment, the effective ingredients of the original powder of Traditional Chinese medicine or decoction pieces of Traditional Chinese medicine are basically not destroyed, and the general sterilization time is 3 ~ 6min.

5. Radiation Sterilization

Radiation sterilization method refers to the method of killing microorganisms by putting the original powder of Traditional Chinese medicine or Chinese medicine decoction pieces into Y rays radiated by suitable radioactive source or electron beam produced by suitable electron accelerator. The most commonly used radiation sterilization method before is 60Co-Y ray radiation sterilization, the irradiation time is 24h to the original powder of Traditional Chinese medicine or Chinese medicine decoction pieces should be as far as possible with low radiation dose to destroy. During sterilization, appropriate chemical or physical methods should be used to monitor the absorbed radiation dose of sterilized primary drug powder to fully prove that the absorbed dose of sterilized primary drug powder is within the specified limit (this sterilization method is not recommended).

Method Steam sterilize Dry heat sterilize Ozone sterilize Microwave sterilize Radiation sterilize
Toxic residual None None None None None
Time About 1 hour Few hours About 1 hour Few minutes Electric bean
Method Batch Batch Batch Succesive Electric bean
Condition High temperature High temperature Room temperature High temperature Special room and facility
Treatment quantity Small Small Middle Big Big
After sterilization Cool down Cool down Stored to be decomposed Cool down N/A
Limit High carbonhydrate and volatile herb is not suitable High carbonhydrate and volatile herb is not suitable Volatile herb is not suitable Not suitable for heat sensitive herb and herb with low wwater content Suitable for majority herbs
microbial/% 95 95 80 95 80
Bactrial/ % 99 〜100 78 〜95 93 〜98 82 〜95 98 〜100
Mold/ % 100 85 〜100 95 〜97 88 〜100 99 〜100

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