Scientists in the 1980s worked really hard to make monumental discoveries. Some of them served a single purpose while some others found abundant widespread usage. MALDI is one such discovery that was intended for just protein and peptide analyses but has found a sea full of applications. From its use in clinical labs for identifications of pathogens, bacteria, mycobacteria, etc to its use in academic labs for DNA and RNA analyses, MALDI has proven its extraordinary potential over the past decades.
In a mass spectrometer, there are a variety of ionization options; two of the most important ones being ESI and MALDI. When students are introduced to the idea of molecular mass measurement of a sample, they tend to get intimidated due to the involvement of several physics, chemistry, and biology concepts that tend to work together for the method.
How a technique that works majorly at the interface of physics and chemistry concepts can decipher the molecular mass of a biological macromolecule is both enthralling and overwhelming for young learners. With a variety of core concepts and novel ideas, summarizing the crux of this MALDI technique can be a task for many educators and teachers.
We, at Labster, understand the complexities faced by students and teachers alike. To solve these issues, we have compiled some resources here. This article can provide some help as it attempts to identify the major issues encountered by students while studying this topic. It also lists practical solutions that teachers and educators can incorporate while teaching the same in their next class. By the end, we’ll convince you why a virtual lab simulation will prove useful not only for your students but also for you as an educator to deliver concepts more efficiently.
There are 3 reasons why students dread and confuse the topic of MALDI. Acknowledging these issues is the first step towards making the topic more approachable.
Most of the time, teaching and learning about such techniques is a task because the basic underlying principles of the technique aren’t clear and crisp. Not being able to follow the premise of molecular mass and ways to determine the same can be very demotivating for students. Understanding the rationale behind the utilization of mechanisms of ionization, excitation of molecules, fragmentation, desorption, etc also poses challenges to most students. Not knowing the basic structures of molecules of interest whether they are proteins, peptides, DNA, RNA, bacteria or others can also lead to difficulty in comprehending how MALDI works for all these different types of molecules.
Most students are unaware of the technique’s utilization when they are taught both theory and lab handling. The same applies to MALDI. Students find this activity of learning the MALDI’s underlying principles a futile exercise since they are not usually acquainted with the art to use those techniques in their experiments and research work. Furthermore, most educators miss out on instilling a habit of scientifically designing experiments and postulating testable and logical hypotheses. Not knowing how to propose null and alternative hypotheses and then testing them lands most students in a situation where they have data from MALDI-MS experiments but don’t know how to analyze and prove them as “scientifically legit”.
There is a serious dearth of visually interactive teaching tools. Instrumentation and equipment for MALDI and mass spectrometry aren’t always available in all high school and university/college setups. In such situations, educators usually try to look out for video or visual demonstrations to bridge these gaps. Not many interactive options are available in the public domain to demonstrate the MALDI and related techniques. This makes the steps of MALDI difficult to follow and comprehend for students. It sometimes also makes teaching sessions monotonous.
To address the issues encountered while teaching about MALDI, educators can engage the under-listed solutions in their classes. Not only can they make teaching easier for educators like you but will also make lessons clearer and easier to assimilate for your students.
Before explaining the different steps of MALDI, we recommend educators explain the basic science topics to students. This can help build a strong foundation over which the entire technique can be built and discussed. We list a few topics you can begin with in your next class.
Idea behind ionization
Idea behind desorption
Idea behind fragmentation
The idea behind the excitation of molecules
The basic structure of the bacterial cell (You can use the Bacterial Cell Structure simulation from Labster)
We think that students shouldn’t be forced to learn the steps of MALDI or any technique per se without knowing “why that step is important”. We recommend educators engage their students in more open-ended discussions when doing wet lab work and analyzing data. We list a few topics that you can explain in depth to deliver the essence of each step of the MALDI technique.
Different types of ionization methods (& how ESI is different from MALDI)
Importance of UV laser
Importance of matrix
Importance of dissolving the sample molecule in matrix
Nature of matrix (solvent)
Importance of selecting the appropriate wavelength of laser
Importance of drying the mixture before analysis
Importance of sterile conditions (dust-free environment, filtered water, etc)
Most often equipment and instrumentation for performing a MALDI-MS experiment are not available in high schools and universities/colleges. In such a case, we recommend educators use meaningful flowcharts and infographics that can precisely deliver the crux of the topic to the students. Educators can use audio cum video demonstrations to bridge the gap. When students see how UV lasers ionize the solid matrix and molecule of interest transforms into ionized molecules, they can better understand what goes on at the molecular level.
You can use diagrams, flowcharts, illustrations, infographics, and GIFs to deliver the essence of the technique.
MALDI is widely used across different fields. It has genuinely served a wider audience than it was intended to when developed in the first place. Educators can inform their students about its utilization across academic research labs and clinical applications. WE list a few of them, to begin with.
Use for studying DNA, RNA, and nucleic acids
Used for studying proteins and peptides
Used for studying and rapid and accurate identification of fungal, bacterial, and mycobacterial pathogens in the clinical microbiology laboratory
Used for protein identification and characterization
Used for viral identification
Used for mutation analysis
Used for genotyping
Used for antiviral resistance studies
Used for early identification of pathogenic species in blood cultures, stool samples, urinary tract infections (UTIs), respiratory tract infections, cerebrospinal fluids
Used for specific identification of Gram-negative and Gram-positive bacteria
Since the topic of MALDI is a practical technique that is best learned with maximum practical lab handling, most educators are disappointed when instrumentation isn’t available at their disposal. This is why we recommend modern-day educators make the maximum use of the MALDI simulation from Labster.
With our visually engaging simulation, your students can virtually learn about the different aspects of this technique. They can collaborate with an anti-doping agent at a bicycle race and investigate if any athlete has used doping substances to boost their endurance and performance. They can virtually apply their knowledge about MALDI and operate a mass spectrometer (MALDI-MS). As they collect and prepare urine samples from different participants, they can learn how samples are processed for the MALDI analysis. They can learn why matrices are so important in MALDI via the short quiz questions and interactive activities. As they move forward, they can learn how mass spectrometry (MALDI-MS) histograms are interpreted and peaks are compared to tell if athletes abused the doping substance or not.
Teachers and educators can make more insightful points as students are rendered with better Pictionary options where they can follow the different concepts in a free-flowing manner. By using this way of active and immersive teaching, our virtual learning platform takes an advent in the field of Science to make the upcoming scientists thorough with the “basics of their respective subjects”.
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