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Synthesis of gold nanoparticles using Euphorbia tirucalli latex and the microwave method 用大麻乳和微波法制备金纳米颗粒
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2018-06-16 DOI: 10.1007/s13404-018-0231-6
Claure N. Lunardi, Mirella P. F. Barros, Marina L. Rodrigues, Anderson J. Gomes
{"title":"Synthesis of gold nanoparticles using Euphorbia tirucalli latex and the microwave method","authors":"Claure N. Lunardi,&nbsp;Mirella P. F. Barros,&nbsp;Marina L. Rodrigues,&nbsp;Anderson J. Gomes","doi":"10.1007/s13404-018-0231-6","DOIUrl":"https://doi.org/10.1007/s13404-018-0231-6","url":null,"abstract":"<p>Uniformly sized and shaped gold nanoparticles (AuNP) were produced by microwave irradiation using <i>Euphorbia tirucalli</i> latex. The AuNPs were characterized by ultraviolet visible spectroscopy (UV–Vis), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering, zeta potential, and transmission electron microscopy (TEM). UV–Vis analysis was employed to detect the characteristic surface plasmon resonance pattern of the AuNPs (550?nm). The carboxylic and polyphenolic groups were associated with the euphol-capped AuNP, which was confirmed using FTIR spectroscopy. The AuNPs studied here show a <i>z</i>-average diameter varying from 35 to 500?±?0.8?nm. TEM reveals that the particles were spherical and polydispersed. The latex itself is very toxic and can be harmful during manipulation, thus highlighting a negative aspect in it use. However, we have demonstrated that the isolation procedure did not impair the reduction action of the dry latex powder. This study provides a robust solution for the synthesis of stable capped gold nanoparticles. Furthermore, the dried powdered <i>E. tirucalli</i> latex seems to be an attractive capping agent for nanoparticles in drug delivery.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2018-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-018-0231-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4652912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
A multi-size study of gold nanoparticle degradation and reformation in ceramic glazes 金纳米颗粒在陶瓷釉料中的降解和重整的多尺度研究
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2018-06-06 DOI: 10.1007/s13404-018-0230-7
Nathan NL. Dinh, Luke T. DiPasquale, Michael C. Leopold, Ryan H. Coppage
{"title":"A multi-size study of gold nanoparticle degradation and reformation in ceramic glazes","authors":"Nathan NL. Dinh,&nbsp;Luke T. DiPasquale,&nbsp;Michael C. Leopold,&nbsp;Ryan H. Coppage","doi":"10.1007/s13404-018-0230-7","DOIUrl":"https://doi.org/10.1007/s13404-018-0230-7","url":null,"abstract":"<p>Most traditional ceramic glazes employ high amounts of transition metal colorants that are toxic to the environment and can cause health issues in humans through surface leaching. Gold nanoparticles (Au-NPs) have been found to be environmentally friendly and non-toxic alternative metal colorant in ceramic glazes. The plasmon band observed with Au-NPs can result in vibrant solutions by manipulating NP size, shape, and concentration; however, the effects of traditional firing in both reductive and oxidative kilns on Au-NPs are poorly understood. Aside from ancient art processes whose mechanisms have not been fully explored, the use of Au-NPs as suspended ceramic glaze colorants remains somewhat unexplored. Au-NPs have been previously reported to diminish in size during sintering and possess significant differences in concentration with respect to reduction and oxidation firing atmospheres. As a means of studying possible degradation/renucleation processes within the glaze during firing, a systematic study introducing different diameter Au-NPs into the glaze materials was conducted with transmission electron microscopy and reflectance spectroscopy used to probe possible mechanisms which showed changes to Au-NP diameter and color intensity, making this work applicable to industry and art current practices.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2018-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-018-0230-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4256097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Au-Au composites with inverse opal structure for surface-enhanced Raman spectroscopy 具有反蛋白石结构的Au-Au复合材料的表面增强拉曼光谱
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2018-06-03 DOI: 10.1007/s13404-018-0234-3
N.A. Martynova, A.E. Goldt, A.V. Grigorieva
{"title":"Au-Au composites with inverse opal structure for surface-enhanced Raman spectroscopy","authors":"N.A. Martynova,&nbsp;A.E. Goldt,&nbsp;A.V. Grigorieva","doi":"10.1007/s13404-018-0234-3","DOIUrl":"https://doi.org/10.1007/s13404-018-0234-3","url":null,"abstract":"<p>Golden inverse opals additionally decorated with 15.5?±?1.5?nm gold nanoparticles are proposed as reusable substrates for surface-enhanced Raman spectroscopy (SERS). Gold nanoparticles are found to be uniformly distributed making an input of enhancement ability of spectral characteristics with the colloidal system by ten times. This technique is demonstrated to be efficient in spectral features tuning via a combination of different gold derivatives. Two lasers served for resonant, pre-resonance, and non-resonance signal analyses. Reusability of the Au-Au composite films is demonstrated for methylene blue as a stable dye deposited onto the SERS chips using a 632.8-nm resonant laser for exciting. The enhancement factor for methylene blue achieved 10<sup>8</sup> and for rohodamine 6G was of about 10<sup>5</sup>. It was observed that rinsing of Au-Au nanocomposite SERS films with distilled water and heating up to 100?°C followed by dropping on a new portion of Au colloids onto the platform regenerates the substrates.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2018-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-018-0234-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4126828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Highlights from recent literature 近期文献亮点
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2018-05-17 DOI: 10.1007/s13404-018-0229-0
Trevor Keel
{"title":"Highlights from recent literature","authors":"Trevor Keel","doi":"10.1007/s13404-018-0229-0","DOIUrl":"https://doi.org/10.1007/s13404-018-0229-0","url":null,"abstract":"","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2018-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-018-0229-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4695313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Au monolayer film coating with graphene oxide for surface enhanced Raman effect 用氧化石墨烯涂覆金单层膜以增强表面拉曼效应
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2018-04-09 DOI: 10.1007/s13404-018-0226-3
Qiang Ma, Xianpei Ren, Liuqing Pang, Min Zhu, Yuzhen Zhao, Siyi Ding, Shaopeng Tian, Huaping Ren, Zongcheng Miao
{"title":"Au monolayer film coating with graphene oxide for surface enhanced Raman effect","authors":"Qiang Ma,&nbsp;Xianpei Ren,&nbsp;Liuqing Pang,&nbsp;Min Zhu,&nbsp;Yuzhen Zhao,&nbsp;Siyi Ding,&nbsp;Shaopeng Tian,&nbsp;Huaping Ren,&nbsp;Zongcheng Miao","doi":"10.1007/s13404-018-0226-3","DOIUrl":"https://doi.org/10.1007/s13404-018-0226-3","url":null,"abstract":"<p>A self-terminated electrochemical atomic layer deposition process is developed to fabricate Au monolayer (ML) film layer-by-layer. It is found that the under potential deposited hydrogen (H<sub>upd</sub>) provides perfect termination after each ML deposition and the further ML growth can be replicated after a surface activation using a positive potential to remove the H<sub>upd</sub> layer. Voltammetric measurements, deposition current analysis, and EQCM show clear characteristics of UPD hydrogen surface termination and the ML deposition. Both XRR and HREED confirm the Au ML film formation. Moreover, the Au ML film appears to be effective for surface enhanced Raman effect of GO on the Au ML film.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2018-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-018-0226-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4367151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Conjugation study of 5-aminolevulinic acid with microbial synthesized gold nanoparticles to evaluate its effect on skin melanoma and epidermoid carcinoma cell lines using photodynamic cancer therapy 5-氨基乙酰丙酸与微生物合成金纳米粒子的结合研究，评价其光动力治疗皮肤黑色素瘤和表皮样癌细胞系的作用
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2017-12-18 DOI: 10.1007/s13404-017-0224-x
S. Aishwarya, K. R. Sanjay
{"title":"Conjugation study of 5-aminolevulinic acid with microbial synthesized gold nanoparticles to evaluate its effect on skin melanoma and epidermoid carcinoma cell lines using photodynamic cancer therapy","authors":"S. Aishwarya,&nbsp;K. R. Sanjay","doi":"10.1007/s13404-017-0224-x","DOIUrl":"https://doi.org/10.1007/s13404-017-0224-x","url":null,"abstract":"<p>Cancer therapy using minimal invasive technique has been a challenge since decades. In the present research, the concept of photodynamic cancer therapy (PDT) has been applied on biologically synthesized nanoparticles for the treatment of skin melanoma (B16F10) and epidermoid carcinoma (A431) cells. The biologically synthesized nanoparticles have been conjugated with a photosensitizer drug 5-aminolevulinic (5-ALA) acid to treat cancer cells by activating the protoporphyrin IX (PpIX) formation through irradiation. Bacterial strain <i>Escherichia coli</i> was used for the synthesis of gold nanoparticles. The size and characteristics of nanoparticles were studied with scanning electron microscope, dynamic light scattering and zeta potential analysis. The gold nanoparticles were encapsulated with polyethylene glycol (PEG) and tagged with 5-aminolevulinic acid, a photosensitizer drug. The drug was activated using a halogen lamp to enhance the production of reactive oxygen species (ROS) molecules. The cytotoxicity of pure nanoparticles and conjugated nanoparticles were assessed on skin melanoma and epidermoid carcinoma cell lines and compared against standard drug 5-ALA, and the production of ROS molecules was measured using a 2,7 dichlorofluorescein-diacetate (DCFH-DA) probe. The results indicated that pure gold nanoparticles had greater cytotoxicity on cells compared to 5-ALA and gold-5-ALA conjugate. But when the cells were subjected to irradiation, the gold-5-ALA conjugate showed higher cytotoxicity than 5-ALA and pure nanoparticles. The cytotoxic levels of gold-5-ALA conjugates were doubled which indicated greater reactive oxygen molecule production compared to other samples.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2017-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-017-0224-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4711405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Highlights from recent literature 近期文献亮点
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2017-11-21 DOI: 10.1007/s13404-017-0223-y
Trevor Keel
{"title":"Highlights from recent literature","authors":"Trevor Keel","doi":"10.1007/s13404-017-0223-y","DOIUrl":"https://doi.org/10.1007/s13404-017-0223-y","url":null,"abstract":"","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2017-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-017-0223-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4834795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Core size matters! High Raman enhancing core tunable Au/Ag bimetallic core-shell nanoparticles 核心尺寸很重要!高拉曼增强核可调金/银双金属核壳纳米粒子
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2017-10-27 DOI: 10.1007/s13404-017-0220-1
Diptiranjan Paital, Tapasi Sen, Amitava Patra, Krishna Kanta Haldar
{"title":"Core size matters! High Raman enhancing core tunable Au/Ag bimetallic core-shell nanoparticles","authors":"Diptiranjan Paital,&nbsp;Tapasi Sen,&nbsp;Amitava Patra,&nbsp;Krishna Kanta Haldar","doi":"10.1007/s13404-017-0220-1","DOIUrl":"https://doi.org/10.1007/s13404-017-0220-1","url":null,"abstract":"<p>Bimetallic core-shell nanostructures have been attracted tremendous attention due to their ability to form novel materials with unique chemical, optical, and physical properties. Here, we have studied the influence of core size of Au/Ag bimetallic core-shell nanostructures on the Raman enhancement efficiency with the Raman-active probe methylene blue. The surface-enhanced Raman scattering intensity is increased with increase in the core size of Au/Ag bimetallic core-shell nanoparticles. Interestingly, the enhancement factor is found to be 6.58?×?10<sup>7</sup> for the Au<sub>100</sub>/Ag core-shell nanoparticles and allows easy detection of analyte methylene blue. Thus, surface-enhanced Raman scattering properties of the metal nanoparticles are significantly enhanced due to the Au/Ag core-shell structures and the enhancement factor is dependent on the size of the core of the bimetallic nanoparticles.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2017-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-017-0220-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5507156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Evaluation of the radiotherapy and proton therapy improvements using gold nanoparticles 金纳米颗粒对放射治疗和质子治疗改善的评价
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2017-08-23 DOI: 10.1007/s13404-017-0216-x
L. Torrisi
{"title":"Evaluation of the radiotherapy and proton therapy improvements using gold nanoparticles","authors":"L. Torrisi","doi":"10.1007/s13404-017-0216-x","DOIUrl":"https://doi.org/10.1007/s13404-017-0216-x","url":null,"abstract":"<p>An evaluation of the improvement in radiotherapy obtained using gold nanoparticles embedded in the tumor tissues is presented for traditional treatments using X-rays and electrons and for innovative proton therapy. The possible nanoparticles’ preparation via physical, by laser ablation in liquids, and chemical techniques is presented. The use of functionalized gold nanoparticles is discussed and results from the study of uptake and decay from mice living systems are reported.</p><p>The improvement obtainable in medical images and in the dose distribution enhancement in disease tissues with respect to healthy ones is investigated.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2017-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-017-0216-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4881878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Rapid synthesis of gold nanoparticles using silk fibroin: characterization, antibacterial activity, and anticancer properties 利用丝素蛋白快速合成金纳米粒子:表征、抗菌活性和抗癌特性
IF 2.2 4区 工程技术
Gold Bulletin Pub Date : 2017-08-22 DOI: 10.1007/s13404-017-0218-8
B. Lakshmeesha Rao, Mahadev Gowda, S. Asha, K. Byrappa, B. Narayana, R. Somashekar, Y. Wang, L. N. Madhu, Y. Sangappa
{"title":"Rapid synthesis of gold nanoparticles using silk fibroin: characterization, antibacterial activity, and anticancer properties","authors":"B. Lakshmeesha Rao,&nbsp;Mahadev Gowda,&nbsp;S. Asha,&nbsp;K. Byrappa,&nbsp;B. Narayana,&nbsp;R. Somashekar,&nbsp;Y. Wang,&nbsp;L. N. Madhu,&nbsp;Y. Sangappa","doi":"10.1007/s13404-017-0218-8","DOIUrl":"https://doi.org/10.1007/s13404-017-0218-8","url":null,"abstract":"<p>In the present work, well-dispersed gold nanoparticles (AuNPs) were synthesised by the reduction of HAuCl<sub>4.</sub>xH<sub>2</sub>O using silk fibroin as a reducing agent. UV-visible spectroscopy confirmed the formation of AuNPs by showing surface plasmon resonance (SPR) at 526–518?nm. The FT-IR study revealed that the hydroxyl groups in the Tyr residue and the carboxyl groups in the Asp and/or Glu residues were the most active functional groups for the conversion of Au ion reduction. The transmission electron microscope (TEM) images showed that the formed nanoparticles were uniformly embedded in the silk fibroin solution. The AuNPs are spherical in shape with smooth edges and around 5–8?nm in diameter. Also, these possess very good stability and dispersity and can be stored for a long period. Further, the X-ray diffraction (XRD) study confirmed the nanocrystalline phase of the gold with cubic crystal structure. The biogenic gold nanoparticles displayed antibacterial activity against Gram-positive and Gram-negative bacteria, and also showed promising anticancer properties.</p>","PeriodicalId":55086,"journal":{"name":"Gold Bulletin","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13404-017-0218-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4846861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 31
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