17 research outputs found
μλ¬Ό λ΄ μμ²μ νΈλΆμ κ²μΆμ μν κΈ λλ Έμ μ-λ¨μΌλ²½ νμλλ ΈνλΈ κΈ°λ° νλ©΄μ¦κ°λΌλ§μ°λ μΌμ ν©μ±
νμλ
Όλ¬Έ(μμ¬) -- μμΈλνκ΅λνμ : λμ
μλͺ
κ³Όνλν λλ¦Όμλ¬ΌμμνλΆ, 2023. 2. κ³½μ μ.Detection of the plant signaling molecules before developing visible symptoms is important for early diagnosis of the plant's disease. In this study, a single-walled carbon nanotube (SWNT)-based surface-enhanced Raman scattering (SERS) nanosensor was fabricated for detecting plant signaling molecules under abiotic stress. SWNT was functionalized with a single-strand DNA (ssDNA) to prepare a SERS template, which provided binding sites for positively charged gold nanoparticles (AuNPs). Initially, AuNPs were grown on the surface of SWNT, but this process was relatively uncontrollable and caused large agglomerates. On the other hand, positively charged poly (diallyldimethylammonium chloride) capped AuNPs (PDDA-AuNPs) could densely assemble along the sidewall of the SWNT through electrostatic interaction and create a large number of hot spots. In vitro SERS spectra of the endogenous plant signaling molecules such as nasturlexin B, thiamine, and ATP were obtained using the nanosensor, and distinct SERS bands of each analyte were shown in the SERS spectra. Biocompatibility of the nanosensor in living plants was demonstrated by measuring the chlorophyll contents and propidium iodide (PI) assay. The strong G band of the SWNT identified the location of the nanosensor in the plants. In addition, the SERS band of the nasturlexin B, one of the plant stress signaling molecules, was presented in SERS mapping obtained upon wounding the leaf. Through our study, plant stress was detected in advance using a SERS nanosensor, which will be of great help in preventing crop loss by monitoring continual plant stress.μλ¬Ό μμ°μ± μ¦μ§μ μν΄μλ κ°μμ μΈ μ¦μ μ΄ λνλκΈ° μ μ μλ¬Όμ μ€νΈλ μ€λ₯Ό μ§λ¨νλ κ²μ΄ νμνλ€. λ³Έ μ°κ΅¬μμλ λΉμλ¬Όμ μ€νΈλ μ€ μΈ μμ²μ μν΄ μμ±λλ μλ¬Ό μ νΈ λΆμλ₯Ό κ°μ§νκΈ° μν λ¨μΌλ²½ νμλλ
ΈνλΈ (SWNT) κΈ°λ°μ νλ©΄μ¦κ°μ°λ (SERS) λλ
Έ μΌμλ₯Ό μ μνλ€. SWNTλ₯Ό (GT)15 μμ΄μ κ°μ§ λ¨μΌ κ°λ₯ DNAλ‘ κΈ°λ₯ν ν (GT)15-SWNTλ₯Ό κΈ λλ
Έμ
μλ₯Ό μ§μμκ² μ§ν©μν€κΈ° μν ν
νλ¦ΏμΌλ‘ μ¬μ©νμλ€. (GT)15-SWNT νλ©΄ μμμ L-μμ€μ½λ₯΄λΈμ°μ μν κΈ λλ
Έμ
μ ν©μ± μ ν΅μ λΆκ°λ₯ν κΈ λλ
Έμ
μ μμ§μ νμ±νκΈ° λλ¬Έμ AuNPλ₯Ό λ°λ μκ² μμΉμν€λ λ° ν¨κ³Όμ μΈ λ°©λ²μ΄ μλμλ€. λ°λ©΄μ, PDDA κ³ λΆμλ‘ κΈ°λ₯νλμ΄ μμ νλ₯Ό λλ κΈ λλ
Έμ
μλ μ μ κΈ°μ μνΈμμ©μ ν΅ν΄ (GT)15-SWNTμ μΈ‘λ²½μ λ°λΌ μ‘°λ°νκ² μμΉν μ μμκ³ , λ§μ μμ ν«μ€νμ μ±κ³΅μ μΌλ‘ μμ±νμμΌλ©° 4.07 β
Ή 10^6μ enhancement factor κ°μ κ°μ‘λ€. SERS λλ
ΈμΌμλ₯Ό μ¬μ©νμ¬ nasturlexin B, TA, ATPμ κ°μ λ΄μΈμ± μλ¬Ό μ νΈ λ¬Όμ§μ SERS μ€ννΈλΌμ μ»μμΌλ©°, νΌν©λ¬Όμμλ κ° λΆμλ¬Ό μ΄ κ°μ§λ κ³ μ μ SERS νΌν¬κ° SERS μ€ννΈλΌμ λνλ¨μ ν΅ν΄ λ€μ€κ²μΆμ΄ κ°λ₯ν¨μ νμΈνλ€. μ물체 λ΄ SERS λλ
ΈμΌμμ μ체μ ν©μ±μ μ½λ‘μμ λλμ PI λΆμμ ν΅ν΄ νμΈνκ³ , SWNTμ κ°ν λΌλ§ μ νΈλ₯Ό μ΄μ©ν΄ λλ
ΈμΌμκ° μ물체 λ΄λ‘ μ λμ
λμμμ μ¦λͺ
νλ€. λλ
ΈμΌμκ° λμ
λ μλ¬Ό μμ μμ²λ₯Ό λΈ ν, 785 nm λ μ΄μ λ₯Ό μ¬μ©ν΄ μ»μ SERS μ€ννΈλΌμμ nasturlexin B μ νΈλ₯Ό μ€μκ° κ²μΆν μ μμλλ°, μ΄λ λ¬Όλμ΄ μλ¬Όκ³Ό κ°μ μμνκ³Ό μλ¬Όμ μ£Όμ μ€νΈλ μ€ μ νΈ λ¬Όμ§ μ€ νλμ΄λ€. λ³Έ μ°κ΅¬λ₯Ό ν΅ν΄ κ°λ°λ SERS λλ
ΈμΌμλ₯Ό μ΄μ©νλ©΄ μλ¬Όμ μ€νΈλ μ€λ₯Ό μ§μμ μΌλ‘ λͺ¨λν°λ§ν¨μΌλ‘μ¨ λμλ¬Ό μμ°μ± ν₯μμ κΈ°μ¬ν μ μμ κ²μΌλ‘ κΈ°λλλ€.β
. INTRODUCTION 1
β
‘. LITERATURE SURVEY 5
2.1. Surface-enhanced Raman scattering (SERS) 5
2.1.1. Principle of SERS 5
2.1.2. Biological application of SERS 6
2.2. Carbon nanomaterial for SERS template 7
2.2.1. Utilization of SWNT as a SERS template 7
2.2.2. Utilization of graphene as a SERS template10
2.3. Nanosensor for detecting plant endogenous signaling molecules in living plants 11
β
’. MATERIALS AND METHOD 13
3.1. Materials 13
3.2. Synthesis of (GT)15-SWNT 13
3.3. Gold nanoparticle decorated (GT)15-SWNT 15
3.4. Fabrication of PDDA-AuNP@SWNT 15
3.5. In vitro SERS spectrum acquisition 17
3.6. Plant growth 17
3.7. Biocompatibility of PDDA-AuNP@SWNT in plants 18
3.8. Monitoring of endogenous stress-dependent biomolecules in living 18
β
£. RESULTS AND DISCUSSION 20
4.1. Characterization of (GT)15-SWNT 20
4.2. Gold nanoparticle decorated (GT)15-SWNT 24
4.2.1. Gold nanoparticle growth on (GT)15-SWNT 24
4.2.2. PDDA capped gold nanoparticles decorated (GT)15-SWNT 29
4.3. Multiplex detection of endogenous plant signaling molecules in vitro 38
4.4. Biocompatibility of PDDA-AuNP@SWNT in plants 41
4.5. Monitoring of wound signal in living plants using nanosensor 43
β
€. CONCLUSION 47
References 49
κ΅λ¬Έμ΄λ‘ 61μ
λ΄κ° κ±Έμ΄μ¨ μμ¬νμ κΈΈ
λλ νκ΅μ λμ΄ 75μΈλ‘ μμ§ κ³Όκ±°λ₯Ό νκ³ ν λμ΄λ μλκ³ , κΈλ
μλ γμ¨κ³‘ μ΄μ΄νμ γκ³Ό 200μ μκ³ μ§ μ½ 1λ§ 2μ² λ§€ λΆλμ γκ³Όκ±°, μΆμΈμ μ¬λ€λ¦¬ - 쑱보λ₯Ό ν΅ν΄λ³Έ μ‘°μ μλ λ¬Έκ³ΌκΈ μ μμ μ λΆμ΄λγ(μ 4κΆ)μ μ§νμ μλ£ν μνμ΄λ€.
μμ§μ νμ¬ μ§ν μ€μΈ λμ μ°κ΅¬μκ°μ΄ μ΄λ»κ² λ³ν μ§λ λͺ¨λ₯΄λ μν©μμ κ³Όκ±°λ₯Ό νμνλ μ΄ μλ¦¬κ° λΆλ΄μ€λ¬μ΄ κ²μ΄ μ¬μ€μ΄λ€. νμ§λ§, μ€κ°λ³΄κ³ λ μ ν 무μλ―Έν κ²μ μλ κ²μ΄λΌλ μκ°μμ μ΄ μ리μ λμ€κ² λμμμ μν΄νμ¬ μ£ΌκΈ° λ°λλ€