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Entry

L-Asparaginase-Based Biosensors

by
João C. F. Nunes
1,
Raquel O. Cristóvão
2,
Valéria C. Santos-Ebinuma
3,
Joaquim L. Faria
2,
Cláudia G. Silva
2,
Márcia C. Neves
1,
Mara G. Freire
1 and
Ana P. M. Tavares
1,*
1
CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
2
Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
3
Department of Engineering Bioprocess and Biotechnology, School of Pharmaceutical Sciences, Universidade Estadual Paulista-UNESP, Araraquara 14800-903, Brazil
*
Author to whom correspondence should be addressed.
Encyclopedia 2021, 1(3), 848-858; https://doi.org/10.3390/encyclopedia1030065
Submission received: 24 June 2021 / Revised: 31 July 2021 / Accepted: 13 August 2021 / Published: 20 August 2021
(This article belongs to the Section Material Sciences)
Browse Figures
Versions Notes

Definition

:
L-asparaginase (ASNase) is an aminohydrolase enzyme widely used in the pharmaceutical and food industries. Although currently its main applications are focused on the treatment of lymphoproliferative disorders such as acute lymphoblastic leukemia (ALL) and acrylamide reduction in starch-rich foods cooked at temperatures above 100 °C, its use as a biosensor in the detection and monitoring of L-asparagine levels is of high relevance. ASNase-based biosensors are a promising and innovative technology, mostly based on colorimetric detection since the mechanism of action of ASNase is the catalysis of the L-asparagine hydrolysis, which releases L-aspartic acid and ammonium ions, promoting a medium pH value change followed by color variation. ASNase biosensing systems prove their potential for L-asparagine monitoring in ALL patients, along with L-asparagine concentration analysis in foods, due to their simplicity and fast response.

1. Introduction

Biosensors are analytical systems consisting of an immobilized biological element combined with a suitable transducer to quantify an analyte [1]. Depending on the biosensor purpose, the most common transducers are electrochemical, piezoelectric, optical, thermometric or magnetic [2]. Biosensors usually generate an electronic or optical signal proportional to the particular interaction between the analyte and the immobilized recognition compound. The low equipment costs, high sensitivity and precision and easy operation have led to increased demand for this type of systems compared to traditional analytical methods [3]. The biological component may be constituted by different bio-recognition elements, such as enzymes, bacteria, tissues, antibodies or nucleic acids, etc. Among them, enzyme-based biosensors have been increasingly used due to their recognized high specificity and exceptional biorecognition capabilities [4]. The enzyme immobilization procedure can influence the biosensor stability, specificity, sensitivity and reproducibility. Therefore, the method used to attach the enzyme onto the electrode must guarantee the stability of the active site and the biomolecule activity. The selection of a suitable technique depends on the biological component nature, the transducer type, the analyte characteristics and the operating conditions. The most used enzyme immobilization methods for the design and development of biosensors are classified into physical adsorption, covalent binding and entrapment [5]. Physical adsorption comprises low associated costs and improved enzymatic performance, whereas entrapment (within the framework of a support) allows enzyme preservation and high enzymatic activity levels. However, physical adsorption can lead to nonspecific adsorption and enzyme desorption, while entrapment can lead to mass transfer limitations and enzyme leakage. On the other hand, by applying a covalent bond between the enzyme and the immobilization support, the enzyme leaching is avoided, allowing for the recovery and reuse of the support/enzyme. Nevertheless, in this last option, the enzyme’s active center amino acids should not be involved in covalent bonding to guarantee high levels of enzyme activity, which is defined by the enzyme binding orientation [6,7].
The enzyme L-asparaginase (E.C.3.5.1.1, ASNase) is a chemotherapeutic agent for the treatment of lymphoproliferative disorders, specifically acute lymphoblastic leukemia (ALL), lymphomas and natural killer cell tumors. The tumor-inhibitory characteristics of ASNase were first reported in animal trials in the 1950s [8,9]. ASNase catalyzes the hydrolysis of L-asparagine into L-aspartic acid and ammonia. Since healthy cells can produce L-asparagine internally, whereas leukemic cells depend on this crucial extracellular amino acid for their growth, prolonged deprivation of L-asparagine in blood leads malignant lymphoid cells into apoptosis [10]. L-asparagine concentration varies from 10−6 to 10−4 M in healthy blood serum samples and from 10−3 to 10−2 M in leukemia blood serum samples [11]. Thus, monitoring L-asparagine depletion in ALL patients is essential to assess the efficacy of ASNase therapy [12]. Full L-asparagine depletion and high ASNase activity are both associated with improved outcomes in ALL patients [13].
ASNase also has an important application in the food industry for acrylamide mitigation from heat-processed foods. Acrylamide is referred to as a Group 2A carcinogen (“probably carcinogenic to humans”) by the International Agency for Research on Cancer (IARC) and by the World Health Organization (WHO) [14,15]. According to the Food and Drug Administration (FDA), the food products with the highest acrylamide concentrations (up to 8440 µg.kg−1) are cereals, french fries, potato chips and cookies, whose average daily acrylamide intake varies from 0.03 to 0.05 µg.kg−1 body weight [6,16]. Nevertheless, the tolerable daily acrylamide intake to avoid carcinogenic risk is 2.6 µg kg−1 body weight [17]. The pre-treatment of starchy foods with ASNase before cooking transforms L-asparagine into L-aspartic acid, and the Maillard reaction takes place without the contribution of L-asparagine, avoiding the acrylamide formation in the final food product [18]. Since the amino acid L-asparagine is not mainly responsible for the taste and appearance of the processed foods, the desired organoleptic characteristics are preserved [19]. Thus, ASNase is already used to lower the acrylamide dosage in several food products, such as potatoes, bread, french fries, coffee and biscuits [6].
ASNase-based biosensors are a promising and innovative technology that can be used both to detect and monitor the level of L-asparagine in blood serum samples of leukemic patients and in different food samples [6]. The methods currently used to detect L-asparagine are based on spectroscopy and chromatography techniques [20], whereas the biosensor operation mode is mostly based on colorimetric detection. The L-asparagine hydrolysis releases ammonium ions, promoting, consequently, a change in the pH value of the medium followed by a variation in the color [21], being the mode of action of colorimetric ASNase-based biosensors (Figure 1). Although there are few reports on the development of ASNase-based biosensors, biosensing systems prove to be imperative for pharmaceutical/food industrial applications due to their simplicity and fast response, while allowing online L-asparagine monitoring.

2. Types and Applications of L-Asparaginase-Based Biosensors

In 1983, the first ASNase-based biosensor was developed for ammonia detection through the combination of an online gas dialyzer, which successfully removed the high levels of ammonia nitrogen background interference from physiological samples, plus a potentiometric ammonia gas detector [22]. This electrode-based, ammonia-liberating ASNase assay system enabled the quick and accurate concentration analysis of L-asparagine in blood serum samples up to 10−4 M levels [22]. In 1995, an ASNase-based biosensor was designed for ammonia detection via the combination of ASNase in garlic tissue cells, responsible for L-asparagine transformation into ammonia, subsequently detected by an ammonia gas electrode. This biosensor displayed a L-asparagine detection limit between 10−4 and 10−1 M [23]. Throughout the years, ASNase-based biosensors have been developed towards the detection of ammonia due to L-asparagine hydrolysis used to monitor L-asparagine in ALL patients, along with L-asparagine concentration analysis in foods (Table 1; Figure 2). Other biosensors were further developed, as detailed below.

2.1. ASNase from Bacteria for the Development of Biosensors

Even though ASNase is broadly distributed in nature (plants, animals, tissues and microorganisms (bacteria, filamentous fungi and yeast)), the majority of commercialized ASNase are from recombinant microorganisms, i.e., Escherichia coli and Erwinia chrysanthemi [6,33,34]. Thus, a simple, safe and real time method suitable for biological applications, based on E. coli ASNase, was produced for ammonia detection by the connection of a conducting polymer, polypyrrole (PPY) probe, previously chemically deposited on the polyimide surface to a piezoelectric quartz crystal (PQC) in multi-channel series (MS) (PPY-MSPQC system) [24]. This method comprises three main elements: an eight-sample detection system, a microprocessor system (responsible for the signal transference from the frequency counter to a computer) and the data output system (Figure 3). In fact, the PPY-MSPQC system enabled an ASNase activity assay with the same accuracy as Nessler’s reagent method due to its excellent ammonia sensing features [24].

2.1.1. Pharmaceutical Industry

An E. coli ASNase-based colorimetric biosensor was established for L-asparagine monitoring in ALL patients via nitrocellulose membrane, silicon gel and calcium alginate beads methods (Table 2) [25]. These methods included the co-immobilization of ASNase solution (0.16 U) and pH indicator phenol red on nitrocellulose membranes, silicon gel coated on glass slides and sodium alginate solution (3%), respectively. While silicon gel showed a L-asparagine detection limit between 10−10 and 10−1 M, calcium alginate beads and nitrocellulose membrane displayed a smaller range of detection (10−9–10−1 M and 10−1 M, respectively). The production of ammonium ions (and L-aspartic acid) by L-asparagine deamination led to a color change from red to violet, which ranged from 5 s to 7 min and 10 s for 10−1 M; 1 to 2 min for 10−5 M; and 3 to 4 min for 10−10 M. In particular, calcium alginate beads presented color change response times of 2 min and 35 s for healthy blood serum samples (10−4 M) and 3 min and 10 s for leukemia blood serum samples (10−2 M), whose biocomponent remained stable for 25 to 30 days [25].

2.1.2. Food Industry

Although most ASNase-based biosensors have been applied to the pharmaceutical industry, certain developed biosensors have been used in the food industry. A fiber optic biosensor developed through the co-immobilization of ASNase producing Coliform bacterial cells, previously isolated from Fortis Hospital, Mohali (India) wastewater and phenol red onto circular plastic discs using tetramethyl orthosilicate (TMOS) sol-gel, was applied to study the L-asparagine concentration of four drinks, namely, tea, pineapple plus mango juice and wine [26]. The biosensor displayed a 7-min response time, detection limit of 1 × 10−9 M and a biocomponent storage stability of 40 days at 4 °C [26]. To surpass a major limitation of enzyme-based biosensors, i.e., the low stability of enzymes, a biosensor for L-asparagine was developed through the immobilization of a thermostable recombinant ASNase from Archaeoglobus fulgidus expressed in E. coli as a fusion protein in front of an ammonium-selective glass electrode, able to operate at high temperatures [27]. This biosensor with increased stability displayed a L-asparagine detection limit of 6 × 10−5 M, enabling its use in the food industry. In fact, ASNase remained stable at 85 °C, keeping 70% of its activity, in addition to showing a higher affinity for L-asparagine at 70 °C (Michaelis constant (KM) of 5 × 10−6) than at 37 °C (KM of 8 × 10−5). This was the first report of a potentiometric biosensor applying a thermostable ASNase [27]. Nevertheless, ASNase with negligible glutaminase activity is required since L-glutamine is an amino group donor for numerous biosynthetic reactions [28,35]. Prolonged low L-glutamine levels impair several biochemical functions, mainly in the liver [28,35]. While ASNase type I is a homodimeric cytosolic constitutive enzyme with high specific activity towards L-glutamine, plus relatively low affinity for L-asparagine, ASNase type II meets all the requirements since it is a homotetrameric periplasmic enzyme with high L-asparagine affinity, plus low activity towards L-glutamine, which is secreted only as a response to exposure to low nitrogen concentrations [6,34]. Instead, an ASNase cuvette-based biosensor was developed through the immobilization of a variant of ASNase from Erwinia carotovora with a single point mutation (Leu71Ile), which showed negligible glutaminase activity, via cross-linking with glutaraldehyde onto the inner surface of a plastic cuvette [28]. However, this biosensor displayed low ASNase activity in addition to low stability [28,29]. Thus, a highly specific ASNase microplate-based biosensor was designed by applying recombinant ASNase from E. carotovora expressed in E. coli, which showed high ASNase, along with low L-glutaminase activity [29]. ASNase extracted from E. carotovora and expressed in E. coli was initially mixed with bovine serum albumin (BSA), which functioned as the enzyme carrier, followed by cross-linking using glutaraldehyde, and deposition of the mixture into the wells of a 96-well microplate. While immobilized ASNase kept half of its initial activity within 30 days, free ASNase lost its activity following 8 days at 4 °C. Moreover, the biosensor presented a L-asparagine detection limit of 10 × 10−6 M, allowing around 20 cycles of sample analysis before total deterioration (ASNase activity below 60% of its initial value). This biosensor enabled micro-volume and high-throughput L-asparagine monitoring in foods, e.g., potatoes (720 ± 35 µg.g−1 to 1560 ± 45 µg.g−1 fresh weight), cheese, juices and asparagus [29].

2.2. ASNase from Plant Species for the Development of Biosensors

As depicted in Table 1, ASNase is present in certain plant species, such as Capsicum annum, Citrus limon, Withania somnifera, Cannabis sativa and Catharanthus roseus, enabling the development of various plant-ASNase-based colorimetric biosensors (Table 2) [11,21,23,30,31,32]. Table 3 summarizes the plant-ASNase-based biosensors, immobilization supports, L-asparagine detection limit, response time range, response time for leukemic blood serum samples and biocomponent stability found in the literature. The co-immobilization of ASNase extracted from the plant C. annum and phenol red via gelatin, polyacrylamide, agar and calcium alginate beads created a cost-effective diagnostic ASNase-based biosensor for L-asparagine monitoring in ALL patients [30]. The biocomponent was coupled with an ammonium ion-selective electrode responsible for the potential detection across its membrane. The immobilization methods include the addition of ASNase solution (0.5 U) to gelatin aqueous solution, acrylamide and bis-acrylamide solution (10%), agar solution (4%) or sodium alginate slurry (3%), followed by phenol red. While all methods displayed a L-asparagine detection limit between 10−9 and 10−1 M, their response time ranged from 10 to 21.6, 10 to 20, 7.5 to 14.2 and 7.1 to 12.3 s, whereas the biocomponent remained active for more than 15 days, 1 month, 15 days and 4 months for gelatin, polyacrylamide, agar, plus calcium alginate beads, respectively. Since the calcium alginate beads presented the fastest time response, in addition to stability for 4 months, this method was applied for L-asparagine detection in healthy (10−4 M) and leukemic blood serum samples (10−2 M), displaying color change response times of 9.4 and 11.2 s, respectively [30]. An alternative plant-ASNase-based biosensor for L-asparagine monitoring in ALL patients was developed through co-immobilization of ASNase extracted from the plant C. limon and phenol red via agar, agarose, gelatin, polyacrylamide and calcium alginate beads methods [31]. These methods consist of the addition of ASNase solution (0.3 U) to agar solution (4%), agarose solution (1.5%), gelatin aqueous solution (10%), acrylamide and bis-acrylamide solution (10%) or sodium alginate slurry (3%), followed by phenol red. All methods showed an L-asparagine detection limit between 10−10 and 10−1 M, while the color change response times were 11, 14, 16, 15, and 9.3 s for healthy (10−4 M), plus 13, 16, 20, 18, and 11 s for leukemia blood serum samples (10−2 M), respectively. The biocomponent remained stable for 1 month, 25, 9 and 25 days, plus 3 months in agar cakes, agarose pieces, gelatin, polyacrylamide gel blocks and calcium alginate beads, respectively. Among these, calcium alginate beads were selected as the best immobilization method [31]. Further developments in cost-effective plant-ASNase-based biosensors for L-asparagine monitoring in ALL patients was achieved by the co-immobilization of ASNase extracted from the plant W. somnifera and phenol red through gelatin, agarose, agar and calcium alginate beads methods [21]. Immobilization methods comprised the addition of ASNase solution (0.5 U) to gelatin aqueous solution (10%), agarose solution (1.5%), agar solution (4%) or sodium alginate slurry (3%), followed by phenol red. All methods presented a L-asparagine detection limit between 10−10 and 10−1 M. Color change response times were 16, 13, 11 and 9.3 s for healthy blood serum samples (10−4 M) and 19, 15, 12 and 11 s for leukemic blood serum samples (10−2 M), respectively. Since the biocomponent remained stable for more than 4, 12, 4 days and 2 months, respectively, along with the lowest response time, calcium alginate was selected as the best method for L-asparagine detection [21].
A different cost-effective plant-ASNase-based biosensor was created by the co-immobilization of ASNase extracted from C. sativa and phenol red using the same immobilization methods, along with Whatman filter paper and hydrosol gel on nylon membrane methods [32]. While all methods displayed the same L-asparagine detection limit (10−10–10−1 M), the response time of the biosensors ranged from 9 to 21 s for leukemic blood serum samples (10−2 M) and from 7.25 to 16 s for healthy blood serum samples (10−5 M). Hydrosol gel on nylon membrane was selected as the best method due to its fastest response time for both leukemic and healthy blood serum samples (9 and 7.25 s). Furthermore, ASNase remained active in air tight containers for more than 4 months after drying [32]. Additionally, ASNase extracted from C. roseus was co-immobilized with phenol red via agar, soil, clay and k-carrageenan methods [11]. Although all methods showed a L-asparagine detection limit ranging from 10−10 to 10−1 M, their response time varied from 7 to 14, 4 to 12, 3 to 11 and 3 to 10 s for agar, soil, clay and k-carrageenan, respectively. Therefore, the k-carrageenan method was selected for the development of a plant ASNase-based biosensor, which enabled L-asparagine concentration quantification in leukemic (10−3–10−2 M) and healthy blood serum samples (10−6–10−5 M) [11]. However, to date, we believe C. sativa-based biosensor using the hydrosol gel on nylon membrane method is the best plant-ASNase-based biosensor since it presented the second lowest response time for leukemia blood serum samples (9 s) in addition to having the highest biocomponent stability (more than 4 months).
All ASNase-based biosensors reported the use of blood serum samples, showing that the interference of the matrix has been considered and can be overcome. However, further studies are required to validate the use of whole blood samples able to overcome interferences of this more complex matrix. On the other hand, biofouling should be considered as well, i.e., the spontaneous macromolecules or microorganisms accumulation, which can physically limit the target analyte diffusion to the sensor surface [36,37,38]. If that is the case, strategies such as antifouling surface coatings with high biocompatibility, which inhibit biofouling through hydrophilic interactions, steric or electrostatic repulsions, plus low surface energy or physical (e.g., physical adsorption, mechanical coating, superhydrophobic, nanoporous structure) plus chemical (e.g., self-assembled monolayers and polymer brushes) strategies must be developed [39].

3. Conclusions and Future Perspectives

ASNase-based biosensors have been increasingly emerging, not only for pharmaceutical applications through the L-asparagine monitoring in blood serum samples, but in the food industry via L-asparagine concentration analysis in foods as well. These biosensing systems display high potential, which is due to their low-cost, simplicity, ease of use, micro-volume, nanolevel L-asparagine detection, fast response and high biocomponent stability.
Thus far, the best developed biosensor within the pharmaceutical field is the C. sativa-based biosensor applying the hydrosol gel on nylon membrane method due to displaying the second lowest response time for leukemia blood serum samples (9 s), in addition to having the highest biocomponent stability (more than 4 months). On the other hand, regarding the food industry, the highly specific ASNase microplate-based biosensor with recombinant ASNase from E. carotovora expressed in E. coli should be highlighted, which kept half of its initial activity within 30 days at 4 °C, allowing around 20 cycles of sample analysis before total deterioration, enabling micro-volume and high-throughput L-asparagine monitoring in potatoes, cheese, juices and asparagus.
Based on these promising results, it is expected the development of additional ASNase-based biosensors using alternative ASNase sources, immobilization supports and methods, leading to the design and subsequent low-cost and scalable production of cutting-edge biosensors. These should be designed to avoid interferences and be able to deal with more complex matrices, such as whole blood samples and more complex food samples. On the other hand, low-cost and novel devices whose mode of action is beyond the color change, as well as with higher accuracy and sensitivity for L-asparagine, along with higher operational stability, should be investigated as alternative strategies.

Author Contributions

J.C.F.N. and R.O.C., writing—original draft preparation; J.C.F.N., M.C.N., A.P.M.T. and M.G.F., conceptualization; V.C.S.-E., J.L.F., C.G.S., M.C.N., M.G.F. and A.P.M.T., review—editing and supervision. All authors have read and agreed to the published version of the manuscript.

Funding

This work was developed within the scope of the project CICECO—Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. This work was also financially supported by Base Funding—UIDB/EQU/50020/2020 of the Associate Laboratory LSRE-LCM-funded by national funds through FCT/MCTES (PIDDAC), and POCI-01-0145-FEDER-031268-funded by FEDER, through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI), and by national funds (OE), through FCT/MCTES, and by FAPESP (2018/06908-8).

Acknowledgments

Ana P. M. Tavares acknowledges the FCT for the research contract CEECIND/2020/01867. Valéria C. Santos-Ebinuma acknowledges FAPESP for financial support. Raquel O. Cristóvão acknowledges FCT funding under DL57/2016 Transitory Norm Programme. João C. F. Nunes acknowledges SPQ and FCT for the PhD fellowship (SFRH/BD/150671/2020).

Conflicts of Interest

The authors declare no conflict of interest.

Entry Link on the Encyclopedia Platform

https://encyclopedia.pub/14463.

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Encyclopedia 01 00065 g001 550
Figure 1. Mode of action of colorimetric ASNase based biosensors.
Figure 1. Mode of action of colorimetric ASNase based biosensors.
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Figure 2. ASNase-based biosensors: ASNase sources, detection methodologies and immobilization supports.
Figure 2. ASNase-based biosensors: ASNase sources, detection methodologies and immobilization supports.
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Encyclopedia 01 00065 g003 550
Figure 3. Schematic diagram of the polypyrrole probe, deposited on the polyimide surface to a piezoelectric quartz crystal in multi-channel series (PPY-MSPQC system).
Figure 3. Schematic diagram of the polypyrrole probe, deposited on the polyimide surface to a piezoelectric quartz crystal in multi-channel series (PPY-MSPQC system).
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Table
Table 1. Industry, application, detection methodology, ASNase source and immobilization supports of ASNase-based biosensors.
Table 1. Industry, application, detection methodology, ASNase source and immobilization supports of ASNase-based biosensors.
IndustryApplicationDetection MethodologyASNase 1 SourceImmobilization
Supports		Ref.
__Ammonia sensingPotentiometric ammonia gas detectorEscherichia coli―[22]
__Ammonia sensingAmmonia gas electrodeGarlic tissue cells―[23]
__Ammonia sensingPolypyrrole probeE. coli―[24]
PharmaceuticalL-asparagine
monitoring in ALL 2
patients		Phenol redNitrocellulose membrane; silicone gel; calcium alginate beads[25]
FoodL-asparagine
concentration analysis in foods		Phenol redColiform
bacterial cells		Tetramethyl orthosilicate sol-gel[26]
Ammonia sensingAmmonium-selective glass electrodeArchaeoglobus
fulgidus		―[27]
Food; pharmaceuticalL-asparagine
concentration analysis in foods; L-asparagine monitoring in ALL 2
patients		Nessler’s
reagent		Erwinia
carotovora		Plastic cuvette[28]
96-well microplate[29]
PharmaceuticalL-asparagine
monitoring in ALL 2
patients		Phenol redCapsicum
annum		Gelatin; polyacrylamide; agar; calcium alginate beads[30]
Citrus limonAgar; agarose; gelatin; polyacrylamide; calcium alginate beads[31]
Withania
somnifera		Gelatin; agarose; agar; calcium alginate beads[21]
Cannabis sativaGelatin; agarose; agar; calcium alginate beads; Whatman filter paper; hydrosol gel on nylon membrane[32]
Catharanthus roseusAgar; soil; clay; k-carrageenan[11]
1 ASNase—L-asparaginase; 2 ALL—acute lymphoblastic leukemia.
Table
Table 2. Colorimetric ASNase-based biosensors: detection methodologies, medium conditions and color change.
Table 2. Colorimetric ASNase-based biosensors: detection methodologies, medium conditions and color change.
Detection MethodologiesMedium ConditionsColor ChangeRef.
Phenol Red↑ pH Encyclopedia 01 00065 i001 Encyclopedia 01 00065 i002 Encyclopedia 01 00065 i003[11,21,25,26,30,31,32]
Nessler’s
reagent		↑ NH4+ Encyclopedia 01 00065 i004 Encyclopedia 01 00065 i005 Encyclopedia 01 00065 i006[28,29]
Table
Table 3. Plant-ASNase-based biosensors, immobilization supports, L-asparagine detection limit (M), response time range (s), response time for leukemic blood serum samples (s) and biocomponent stability.
Table 3. Plant-ASNase-based biosensors, immobilization supports, L-asparagine detection limit (M), response time range (s), response time for leukemic blood serum samples (s) and biocomponent stability.
Plant-ASNase 1-Based BiosensorsImmobilization SupportsL-Asparagine Detection Limit (M)Response Time Range (s)Response Time for Leukemic Blood Serum Samples (s)Biocomponent StabilityRef
C. annum-based biosensorGelatin10−9–10−110–21.620>15 days[30]
Polyacrylamide10–2018.7>1 month
Agar7.5–14.212.5>15 days
Calcium alginate beads7.1–12.311.2>4 months
C. limon-based biosensorAgar10−10–10−16–14.2131 month[31]
Agarose9–16.41625 days
Gelatin10–22209 days
Polyacrylamide10–201825 days
Calcium alginate beads7–12113 months
W. somnifera-based biosensorGelatin10−10–10−110–2219 ± 0.5>4 days[21]
Agarose10–1715>12 days
Agar7–1412>4 days
Calcium alginate beads7–1211>2 months
C. sativa-based biosensorGelatin10−10–10−18–2119―[32]
Agarose9.17–1615.8―
Agar7.3–1513.3―
Calcium alginate beads7–1111.1―
Whatman filter paper11–2321―
Hydrosol gel on nylon membrane5–109>4 months
C. roseus-based biosensorAgar10−10–10−17–14――[11]
Soil4–12――
Clay3–11――
k-carrageenan3–107―
1 ASNase—L-asparaginase.
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Nunes, J.C.F.; Cristóvão, R.O.; Santos-Ebinuma, V.C.; Faria, J.L.; Silva, C.G.; Neves, M.C.; Freire, M.G.; Tavares, A.P.M. L-Asparaginase-Based Biosensors. Encyclopedia 2021, 1, 848-858. https://doi.org/10.3390/encyclopedia1030065

AMA Style

Nunes JCF, Cristóvão RO, Santos-Ebinuma VC, Faria JL, Silva CG, Neves MC, Freire MG, Tavares APM. L-Asparaginase-Based Biosensors. Encyclopedia. 2021; 1(3):848-858. https://doi.org/10.3390/encyclopedia1030065

Chicago/Turabian Style

Nunes, João C. F., Raquel O. Cristóvão, Valéria C. Santos-Ebinuma, Joaquim L. Faria, Cláudia G. Silva, Márcia C. Neves, Mara G. Freire, and Ana P. M. Tavares. 2021. "L-Asparaginase-Based Biosensors" Encyclopedia 1, no. 3: 848-858. https://doi.org/10.3390/encyclopedia1030065

APA Style

Nunes, J. C. F., Cristóvão, R. O., Santos-Ebinuma, V. C., Faria, J. L., Silva, C. G., Neves, M. C., Freire, M. G., & Tavares, A. P. M. (2021). L-Asparaginase-Based Biosensors. Encyclopedia, 1(3), 848-858. https://doi.org/10.3390/encyclopedia1030065

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