Airborne bacteria refer to microorganisms such as bacteria, fungi, and actinomycetes suspended in the air, and their quantity and activity directly affect environmental cleanliness, product quality, and human health. As a core device for accurately capturing such microorganisms, the planktonic bacteria sampler, with its scientific sampling principles and intelligent design, has become a monitoring tool in the fields of pharmaceuticals, medicine, food, biosafety, etc., building an "invisible defense line" for clean environments.

　　1、 The working principle of planktonic bacteria sampler: the core logic of scientifically capturing microorganisms

The core of the planktonic bacteria sampler is to physically separate microorganisms from the air, enabling them to be separated from the airflow and effectively collected. The core principle is based on the following three mainstream technologies:

1. Impact method (mainstream technology): Using the principle of "inertial impact", a stable airflow is generated by a high-speed fan, and the air is sprayed at a specific speed onto the surface of the agar medium in the culture dish. Microorganisms in the air, due to their inertia greater than the airflow, cannot change direction with the airflow and directly collide and adhere to the culture medium, achieving the separation of microorganisms from the air. This technology can be subdivided into the "Anderson cascade impact method" (simulating the structure of the human respiratory tract and capturing microorganisms of different particle sizes in stages) and the "single-stage impact method", among which the Anderson impact method can accurately collect microorganisms of 0.65-10 μ m, which meets the needs of actual infection risk monitoring.

2. Filtration method: Utilizing the retention effect of porous membranes (such as polytetrafluoroethylene and cellulose membranes), microorganisms are intercepted by the pores of the membrane when air passes through it. After sampling, transfer the filter membrane to the culture medium for cultivation, which is suitable for low concentration microbial environments (such as cleanliness areas) and has the advantages of large sampling volume and low detection limit.

3. Centrifugal method: By generating centrifugal force through high-speed rotation, microorganisms in the air are separated from the airflow under the action of centrifugal force and thrown into a pre placed culture medium or collection solution. This technology does not require high-pressure airflow, has low noise, and is suitable for small spaces or scenarios that are sensitive to airflow (such as biosafety laboratories).

Regardless of the technique used, the collected microbial culture medium must be placed in a constant temperature incubator for cultivation after sampling. By counting the number of colonies and combining with the sampling volume, the concentration of planktonic bacteria per unit volume of air (CFU/m ³) can be calculated to complete quantitative analysis.

　2、 The core function of the planktonic bacteria sampler is to adapt to monitoring needs in multiple dimensions

Modern planktonic bacteria samplers have evolved from single sampling to integrated "sampling recording safety intelligence", with core functions including:

1. Precise sampling control: The sampling flow rate can be accurately adjusted (common range 10-100L/min), with a flow error of ≤± 2%. It supports custom sampling time (1-24 hours) and sampling volume (0.1-100m ³), meeting the monitoring requirements of different cleanliness levels (such as ISO 1-9 levels). Some devices have the function of "automatic flow compensation", which can resist the influence of changes in air pressure and temperature on sampling accuracy.

2. Full process data traceability: Equipped with a built-in storage chip, it can record thousands of sampling data (including sampling time, flow rate, environmental temperature and humidity, operator information, etc.), support USB, RS485 and other export methods, and meet the data traceability requirements of GMP, ISO and other industry certifications.

3. Environmental adaptability design: The sampling head is made of sterile materials (such as stainless steel, polycarbonate), which can be sterilized at high temperatures or ultraviolet radiation to avoid cross contamination; The host has dust-proof, moisture-proof, and anti electromagnetic interference performance, suitable for various scenarios such as clean rooms, laboratories, workshops, and outdoor environments. Some explosion-proof models can be used in high-risk areas of chemical and pharmaceutical industries.

4. Safety protection and sterility assurance: equipped with ultraviolet disinfection module (automatic disinfection of sampling pipeline before and after sampling), anti backflow design (to avoid contamination of culture medium), and some equipment supports aseptic chamber operation, reducing the risk of operators coming into contact with pathogenic microorganisms.

5. Intelligent control: supports touch screen, mobile APP or remote control on computer, and can set timed sampling and cyclic sampling tasks; Some devices integrate temperature, humidity, and particle concentration monitoring functions to achieve synchronous collection of multiple parameters.

　3、 Application scenarios of planktonic bacteria sampler: covering microbial prevention and control in multiple fields

The application of planktonic bacteria samplers runs through the entire chain of "production medical public health scientific research" and is a key tool for microbial prevention and control:

1. Pharmaceutical industry: used for monitoring the cleanliness of drug production workshops (such as sterile preparation and biological product workshops) and pharmaceutical excipient warehouses, ensuring that the production environment meets GMP certification requirements and avoiding microbial contamination that may cause drug spoilage.

2. Medical field: hospital operating rooms ICU、 Monitoring of airborne microorganisms in high-risk departments such as neonatology and hematology to promptly warn of the risk of hospital acquired infections; Validation of disinfection and sterilization effects of medical devices (such as endoscopy centers and disinfection supply centers).

3. Food processing: Hygiene monitoring of production workshops for dairy products, meat products, baked goods, etc., controlling the number of microorganisms in the air, preventing food mold and spoilage, and ensuring food safety.

4. Biosafety and scientific research: pathogen monitoring in biosafety laboratories (BSL-2/3 level) and virus research institutions to prevent aerosol leakage; Microbial community analysis in environmental science research, such as haze and indoor air quality.

5. Public places and special industries: hygiene monitoring in densely populated areas such as airports, subways, and shopping malls; Microbial control in clean workshops of the electronics and semiconductor industries to prevent the failure of chips and other products due to microbial contamination.

　　4、 Technical advantages of planktonic bacteria sampler

Compared to traditional microbial sampling methods such as sedimentation and natural exposure, planktonic bacteria samplers have significant advantages:

1. Higher sampling efficiency: Traditional sedimentation methods rely on natural microbial sedimentation, which takes a long sampling time (usually more than 30 minutes) and can only capture large particle size microorganisms; The sampler can complete high volume sampling in 10-30 minutes by actively inhaling, effectively capturing suspended microorganisms above 0.5 μ m and covering a wider range of particle sizes.

2. More accurate and quantitative data: Traditional methods can only qualitatively determine the presence or absence of microorganisms, or roughly estimate their quantity; The sampler can achieve quantitative analysis (unit: CFU/m ³) by accurately controlling the sampling volume and flow rate, combined with colony counting. The data has strong repeatability and meets industry standards.

3. More convenient and safe operation: Traditional methods require manual placement and retrieval of culture dishes, which can easily cause secondary pollution; The sampler has a high degree of automation, a closed sampling process, and some models support disposable sterile sampling heads to reduce operational risks.

4. Adapt to complex scenarios: Traditional methods are greatly affected by environmental airflow and temperature, and are only suitable for static environments; The sampler has flow compensation and anti-interference design, and can stably sample in dynamic environments such as workshop production and personnel flow.

　　5、 The development trend of planktonic bacterial samplers: precision, intelligence, and multifunctional integration

With the upgrading of microbial monitoring requirements and technological iteration, planktonic bacterial samplers are developing in the following directions:

1. Precision upgrade: Optimize the design of the sampling head (such as multi-stage impact structure) to improve the capture efficiency of microorganisms with small particle sizes (0.3-0.5 μ m); Using laser assisted counting technology to achieve real-time quantification of microorganisms without the need for cultivation waiting.

2. Intelligent integration: Combining AI algorithms and big data to predict microbial pollution trends by analyzing historical monitoring data; Integrate wireless communication modules (5G, NB IoT) to achieve multi device networking management and remote warning.

3. Multi functional integration: In addition to planktonic bacteria, it integrates air particle counting, temperature and humidity, formaldehyde, VOC and other parameter monitoring to create a "one-stop environmental monitoring terminal" that adapts to the comprehensive monitoring needs of multiple scenarios.

4. Miniaturization and portability: We have launched a handheld portable sampler with a weight control of 1-3kg, equipped with rechargeable batteries, to meet the needs of outdoor emergency monitoring (such as epidemic prevention and control, sudden pollution incidents) and mobile sampling.

5. Aseptic and automated: using disposable sterile sampling consumables and automatic sterilization pipelines to reduce manual intervention; Some equipment can be linked with the incubator to achieve automation of the entire process of sampling, cultivation, and counting.

The emergence of planktonic bacteria samplers has promoted the transformation of air microbial monitoring from "qualitative extensive" to "quantitative accurate", providing core technical support for product quality and safety, public health protection, and biosafety prevention and control. In the future, with the continuous upgrading of technology, this "microbial catcher" will become more intelligent, efficient, and portable, building solid microbial prevention and control barriers in more fields, and helping to achieve the sustainable development goal of "clean environment and safety guarantee".