| 1 |
What is the main advantage of using nanomaterials in electrochemical sensors for medical diagnostics?
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3. They enhance sensitivity and surface area for detection |
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หนึ่งในคุณูปการที่สำคัญที่สุดของนาโนเทคโนโลยีต่อการวินิจฉัยทางการแพทย์คือการเพิ่มความไวและความจำเพาะเช่น อนุภาคนาโนทองคำสามารถเพิ่มสัญญาณไฟฟ้าเคมีได้โดยการให้พื้นที่ผิวขนาดใหญ่สำหรับการตรึงไบโอโมเลกุล ส่งผลให้มีความไวในการตรวจจับไบโอมาร์กเกอร์ที่มีปริมาณน้อย
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1.3.1. Enhancing sensitivity and specificity
One of the most significant contributions of nanotechnology to
medical diagnostics is the enhancement of sensitivity and specificity.
Nanomaterials such as nanoparticles, nanowires, nanotubes, quantum
dots, and graphene have unique electrical, optical, and chemical properties that can significantly improve the detection capabilities of electrochemical sensors (Table 3) [15]. For instance, gold nanoparticles can
enhance the electrochemical signal by providing a large surface area for
the immobilization of biomolecules, leading to higher sensitivity in
detecting low-abundance biomarkers [21].
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| 2 |
Which of the following nanomaterials is frequently mentioned as enhancing sensor conductivity?
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2. Gold nanoparticles |
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การตรวจจับลำดับ DNA หลายตัวพร้อมกัน ไบโอมาร์กเกอร์ใฃ้อนุภาคทองคำในการผลิตด้วยวิธีElectrochemical
Arrays
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Table 5
Details on various multiplexing techniques, the materials used, and their applications for detecting multiple analytes.
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| 3 |
Why are carbon-based nanomaterials such as carbon nanotubes (CNTs) useful in electrochemical sensors?
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1. They block interference from enzymes |
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นาโนทิวบ์ โดยเฉพาะคาร์บอนนาโนทิวบ์ (CNT) เป็นโครงสร้างนาโนทรงกระบอกที่มีคุณสมบัติทางไฟฟ้า เชิงกล และความร้อนที่ยอดเยี่ยมมีหมู่ฟังก์ชันที่สามารถนำไปใช้ในการปรับปรุงเพิ่มเติม ซึ่งทำให้สามารถตรึงเอนไซม์ แอนติบอดี และองค์ประกอบการจดจำอื่นๆ ได้
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They come in two main forms: single-walled carbon
nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs).
The SWCNTs have a single layer of graphene rolled into a tube and
exhibit excellent electrical conductivity and high surface area, making
them suitable for detecting various analytes, including DNA, proteins,
and gases. The MWCNTs consist of multiple layers of graphene tubes and
offer high mechanical strength and stability. They are used in sensors for
detecting glucose, dopamine, and other biomolecules. Quantum dots
(QDs) are semiconductor nanocrystals with sizes typically below 10 nm.
They possess unique optical and electronic properties, such as sizetunable fluorescence and high electron mobility [50].
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| 4 |
What is one challenge in integrating nanotechnology with electrochemical sensors for medical use?
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3. Issues in reproducibility and standardization |
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แม้ว่าเซ็นเซอร์ที่เสริมประสิทธิภาพด้วยนาโนเทคโนโลยีจะมีคุณสมบัติที่น่าสนใจ แต่การนำไปใช้งานในตลาดอาจล่าช้าเนื่องจากต้นทุนการพัฒนาที่สูง การขาดมาตรฐาน และการแข่งขันกับเทคโนโลยีการวินิจฉัยที่มีอยู่เดิม การแสดงให้เห็นถึงข้อได้เปรียบที่ชัดเจนของเซ็นเซอร์ที่เสริมประสิทธิภาพด้วยนาโนเทคโนโลยี
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4.3.1. Technical and material challenges
Nanomaterials often exhibit high sensitivity and specificity, but their
stability over time can be a significant issue [79]. The reproducibility of
sensor performance can also be affected by variations in nanomaterial
synthesis and sensor fabrication processes [73,80]. To address stability,
researchers are developing surface modifications and encapsulation
techniques that protect nanomaterials from environmental degradation.
Standardizing synthesis and fabrication protocols can improve reproducibility.
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| 5 |
Which technique is commonly used to enhance the signal in nanotechnology-based electrochemical sensors?
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2. Enzyme labeling |
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Enzymes, with their high catalytic efficiency and specificity, are also crucial in signal amplification. They facilitate the detection of small amounts of targets by catalyzing reactions that produce measurable signals. Methods like enzyme immobilization (physical adsorption, covalent binding, encapsulation, or cross-linking) are used to enhance signal generation.
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4.2. Fabrication techniques
The fabrication of electrochemical sensors incorporating nanomaterials requires precise and reliable techniques to ensure high performance, reproducibility, and scalability. The choice of fabrication
technique depends on the desired properties of the sensor, the type of
nanomaterials used, and the specific application. Key fabrication techniques include chemical vapor deposition (CVD), electrospinning,
lithography, self-assembly, and drop-casting [63–78].
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| 6 |
Why is biocompatibility crucial in designing electrochemical sensors for medical diagnostics?
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2. To prevent rejection or toxicity in biological systems |
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Biocompatibility is crucial in designing electrochemical sensors for medical diagnostics because it ensures the sensor can safely interact with biological systems without causing harm or adverse reactions.
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A biocompatible sensor minimizes the risk of inflammation, rejection, or toxicity, allowing for accurate and reliable measurements of biomarkers within the body.
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| 7 |
How do label-free electrochemical sensors differ from labeled ones?
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3. They do not rely on additional reagents or markers |
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Label-free electrochemical sensors detect analytes by measuring changes in the sensor's inherent properties upon binding, without needing labels like enzymes or fluorescent tags.
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Nanoparticles can be physically adsorbed onto the electrode surface
through van der Waals forces or electrostatic interactions, providing a
simple and effective method for enhancing sensor performance.
Layer-by-layer assembly is a versatile technique for creating multilayered nanostructures on the electrode surface. This method involves
sequentially depositing alternating layers of nanomaterials and other
functional molecules [60].
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| 8 |
What is one promising application of nanotech-based electrochemical sensors?
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2. Early detection of disease biomarkers |
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Addressing these challenges requires a multidisciplinary approach, combining expertise in nanotechnology, materials science, engineering, and regulatory affairs. By overcoming these obstacles, nanotechnology-enhanced electrochemical sensors can fulfill their promise of revolutionizing medical diagnostics, offering highly sensitive, rapid, and portable solutions for detecting a wide range of health conditions.
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5.1. Detection of biomarkers
The detection of biomarkers is crucial for the diagnosis, monitoring, and management of various diseases. Electrochemical sensors enhanced with nanotechnology have significantly advanced the field of biomarker detection due to their high sensitivity, specificity, and rapid response times. This section explores the detection of key biomarkers such as glucose, cholesterol, and cancer biomarkers using nanotechnology-enhanced electrochemical sensors.
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| 9 |
Which of the following factors most directly affects the sensor's detection limit?
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1. Sample pH |
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นาโนวัสดุอาจมีความไวสูงต่อการเปลี่ยนแปลงของอุณหภูมิ ค่า pH และปัจจัยด้านสิ่งแวดล้อมอื่นๆ ซึ่งอาจทำให้ค่าที่อ่านได้ผิดพลาดหรือผลลัพธ์ไม่สอดคล้องกัน
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Nanomaterials can be highly sensitive to changes in temperature, pH, and other environmental factors, which may lead to false readings or inconsistent results [[71], [72], [73], [74], [75], [76], [77], [78], [79], [80], [81], [82], [83], [84], [85]]. Encapsulating nanomaterials in protective coatings or integrating them into stable matrix materials can mitigate the effects of environmental fluctuations. Additionally, developing calibration protocols that account for environmental variations can improve the reliability of sensor readings. Ensuring the biocompatibility of nanomaterials is crucial for in vivo applications. Some nanomaterials may induce cytotoxicity or immune responses, limiting their clinical utility [74].
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| 10 |
What is one of the primary goals of using digital sensing technologies in cancer care?
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2. Eliminate the need for imaging scans |
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Which type of sensor is often used to monitor physical activity in cancer patients?
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3. Accelerometers |
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Why are patient-reported outcomes important in digital cancer care systems?
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5. They are required for insurance approval |
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| 13 |
What is one major advantage of real-time digital sensing in cancer treatment?
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3. Rapid detection of deterioration in patient condition |
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Which of the following is a key barrier to implementing digital sensing in routine oncology practice?
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4. Overabundance of clinical evidence |
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Which stakeholders are considered central to the adoption of digital cancer care platforms?
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2. Patients and healthcare providers |
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Digital sensing systems collect which combination of data types for cancer care optimization?
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1. Blood type and genetic code |
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How do digital sensors contribute to improving the quality of life in cancer patients?
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3. By enabling symptom tracking and early intervention |
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| 18 |
What does the article suggest about the future direction of digital sensing in cancer care?
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3. It holds promise for widespread personalized care |
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| 19 |
Based on the diagram, which of the following would most likely result in a false signal output in an electrochemical sensor for medical diagnostics?
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5. Applying nanomaterials to enhance the electron flow at the electrode |
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| 20 |
Based on the image, which of the following scenarios best demonstrates the advantage of using emerging digital platforms in cancer diagnostics?
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4. A pathologist freezes a tumor sample for histological staining |
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