Quotation for sniffer

Olfactory detection port ODP4

ODP4 inherits all the features and advantages of ODP3. It is also a non retention simultaneous transfer, that is, the compounds separated by the chromatographic column enter the mass spectrometry MSD and ODP4 detection ports simultaneously through the Y-shaped interface. While analyzing the mass spectrometry properties of compounds, sensitive olfactory organs are utilized to detect odorous compounds. The sensitivity of MSD in SIM mode ranges from Pic PG (10-12) to Fick FG (10-15), while the sensitivity of the human nose can reach Ak AG (10-18). The nose is a more sensitive odor substance detector.

It's not enough to achieve both seamless and non discriminatory delivery. Our pursuit is to deliver without discrimination. Through minimal dead volume, comprehensive heating, and highly inert materials, we can ensure high boiling point, polarity, and active odor compounds enter the detection port without discrimination. As we all know, many odor compounds are polar, and if heated unevenly or at a low temperature, they can easily stick to the transmission pathway. Even though the set carrier gas flow rate and transmission line distance theoretically provide the possibility of them entering the nose at the same time, the actual result is that they have no intention of leaving. Zhestai's ODP can achieve comprehensive heating, with a transmission line temperature of 350 ° C and a mixing chamber temperature of up to 250 ° C. Generally, the set temperature of the transmission line is 10 to 20 degrees higher than the GC column box temperature. The following is a schematic diagram of the heating zone:

The new ODP4 is more user-friendly in terms of comfort, with the option to add moisture to ODP3. Even if smelled for a long time, it will not cause dryness in the nasal cavity. And it is equipped with different types of sniffing glass tools to meet different needs, including funnel shaped and short glass tube shaped ones. In years of communication with our clients, we have learned that long-term sniffing work requires correct sitting posture to avoid fatigue in the back and neck. Therefore, in the new ODP4 design, we have applied a flexible positioning bracket, the red part in the picture, so that every sniffer can find a suitable working position, making sniffing easier. The replaceable bayonet PTFE outer ring is easy to replace, and each sniffer can keep their own outer ring and glass tools to improve hygiene during work. Another important detail is the nose positioning point, where the sniffer can close their eyes and focus on sniffing. By touching the positioning point, they can keep the nose in the correct position and avoid deviation.

Sometimes when sniffing, one may encounter a situation where the odor can be smelled at a certain retention time, but there is no response on the mass spectrum. Possible scenarios are: 1 The concentration of the substance is too low, below the detection limit of the mass spectrometer detector. Do you remember the difference between being able to smell Ak AG with your nose and being able to smell Fek FG with a mass spectrometer, which is a whole three orders of magnitude. Or 2. Mass spectrometry detectors are not suitable for analyzing compounds such as nitrogen or sulfur, and specialized element detectors NPD and FPD are required. In either case, it would be great if the odor compounds detected could be captured through a thermal desorption tube with an adsorbent, and then enriched through multiple injections and captures. In this way, the enriched compounds can meet the detection limit of mass spectrometry and cope with various situations. Alternatively, the collected compounds can be subjected to thermal desorption analysis on other instruments equipped with elemental analysis detectors to address the second scenario. This is the dual function of "sniffing and capturing" in our ODP4. With a bayonet style adapter, any size of thermal desorption tube can be easily inserted into the olfactory detection port at any desired retention time. One in, one out, simple capture and enrichment functions can be achieved. The more advanced name is "offline two-dimensional chromatography technology". Greatly improve the sensitivity and flexibility of analysis without changing the instrument configuration.

Like ODP3, ODP4 can record the intensity of odors by pressing the button on the odor intensity recording handle while sniffing. The standard odor level has 4 levels, which means there are 4 buttons for recording. Nowadays, ODP4 has also launched a Level 6 controller that meets China's odor rating standards. Generally, level four can meet the majority of olfactory requirements, especially through odor dilution method, which can effectively evaluate the intensity and contribution of odors. At the same time, we also provide the function of recording voice, which can directly describe the odor characteristics when smelling, without the need for note taking. Of course, whether to use voice or hand recording is a choice based on the different habits of the sniffer.

In addition to the extensive hardware upgrades, the next step is the hardcore software ODI we provide to our customers,

Zhestai Olfactory Data Processing Software (ODI) allows you to quickly and reliably evaluate olfactory information to identify unknown odor active compounds. ODI can perform classic aroma extract dilution analysis (AEDA), odor evaluation group analysis, multivariate data analysis, and provide functions such as mass spectrometry database queries.

Accumulated olfactory mapIf GC/O is used to measure samples at different dilutions, it can be easily accumulated in ODI software to obtain an olfactory map, where ODI adds the respective odor intensities to the total value. Substances that are still considered to have odor activity or above the odor threshold at dilution levels produce high signal levels in the accumulated olfactory map. Therefore, the "cumulative olfactory map" function can quickly and reliably provide users with information on which compounds can still form odor impressions even at low concentrations, and these compounds belong to the odor active ingredients in the sample.

Aroma Extraction Dilution Analysis (AEDA)ODI software can perform classical aroma extract dilution analysis (AEDA) by determining the odor dilution factor (FD). The FD value of odor dilution factor refers to the ratio of the concentration of the odor substance in the initial extract to the concentration of the odor substance at its thinnest point (which can still be detected by GC/O), which can be used to reflect the effectiveness of the odor substance. This software can transfer the determined information to a printable report.

Analysis by odor assessment teamIf the sample is evaluated by an odor assessment team, ODI can collect sensory odor impressions from all team members. These pieces of information may be crucial for further analysis and identification of odors; However, manually generating them requires a considerable amount of work and time. The olfactory data processing software can perform analysis of odor evaluation teams with just a click of the mouse and immediately provide the detection frequency for each compound.

Mass spectrometry database query functionODI software integrates many functions related to mass spectrometry extraction, purification, and interpretation. Can perform graph recognition on databases with different file formats. Zhestai recommends the NIST AMDIS software, which can be called in ODI software and can perform deconvolution on data.

We hope that the new features of our ODP4, whether hardware or software, can help you with your sniffing and data analysis work in the future. Over the years, we have accumulated a lot of experience in the production and application of olfactory recognition. Every year, we also invite olfactory experts to our company for workshops, providing customers with theoretical and practical training on odor recognition. Finally, let's review the new features of ODP4 together: