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Strategies in Improving Sensitivity of Colorimetry Sensor Based on Silver Nanoparticles in Chemical and Biological Samples Hanim Istatik Badi'ah; Dinda Khoirul Ummah; Ni Nyoman Tri Puspaningsih; Ganden Supriyanto
Indonesian Journal of Chemistry Vol 22, No 6 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.73194

Colorimetric sensors-based silver nanoparticles (AgNPs) are very interesting to be studied and developed because of the simplicity and ease in the principle of detection. It does not require sophisticated and affordable tools but still has high sensitivity. The coefficient extinction of AgNPs is relatively higher than AuNPs of the same size, making the sensitivity of AgNPs higher than AuNPs. The principle of detection is based on the aggregation of nanoparticles with analytes that causes shifting in Localized Surface Plasmon Resonance (LSPR) to a larger wavelength, commonly called a bathochromic shift or redshift. It is a favorite phenomenon because it is more easily observed with naked eyes. This sensor shows a good analytic performance with high sensitivity due to strong LSPR and good strategies that selectively bring interaction between analytes and AgNPs. AgNPs are characterized using UV-Visible (Ultra Violet-Visible), TEM (Transmission Electron Microscope), FTIR (Fourier Transform Infrared), and DLS (Dynamic Light Scattering), and many analytes have been detected with this sensor successfully. This article discusses several important parameters in increasing the sensitivity of AgNPs colorimetric sensors. Finally, it can be used as guidelines in the development of methods in the future.

Edukasi Analisis Kesehatan tentang Keamanan Makanan Ringan dan Minuman Kemasan pada Santri Pondok Pesantren Queen Al Ishlah Banyuwangi Ani Qomariyah; Hanim Istatik Badi'ah
Aksiologiya: Jurnal Pengabdian Kepada Masyarakat Vol 7 No 3 (2023): Agustus
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/aks.v7i3.12792

Di lingkungan Pondok Pesantren, pada jam istirahat biasanya para santri membeli jajanan dan minuman di kantin atau koperasi Ponpes. Para santri yang kebanyakan usia anak sekolah, merupakan konsumen utama jajanan, seringkali tidak faham dan tidak memperhatikan keamanan makanan dan minuman yang dibelinya. Mereka cenderung memilih snack dan soft drink sesuai kesukaannya, tanpa memperhatikan dan mempertimbangkan kesehatan dan kebersihannya. Ponpes Queen Al-Ishlah yang berlokasi di Desa Tapanrejo Kecamatan Muncar Kabupaten Banyuwangi ini seperti lembaga-lembaga pada umumnya yang memiliki kantin dan koperasi. Namun, kondisi yang ada belum dapat dikatakan sebagai kantin yang sehat. Kegiatan Pengabdian kepada Masyarakat ini bertujuan untuk meningkatkan pengetahuan serta mengubah kebiasaan jajan pada anak-anak. Kegiatan berupa edukasi dengan metode penyuluhan selama 2 hari dengan jumlah santri 20 orang. Tim pelaksana terdiri dari 2 orang dosen dan dibantu 3 orang mahasiswa dari STIKES Banyuwangi. Pelaksanaan kegiatan dengan metode hybrid melalui Zoom dan offline di lokasi Pondok Pesantren. Hasil dari kegiatan ini, terungkap bahwa pengetahuan para santri terhadap keamanan snack dan soft drink tergolong rendah. Perhatian orang tua serta guru di Ponpes terhadap budaya jajan santri sangat diperlukan. Konsep pemahaman yang benar harus ditanamkan sejak dini agar dapat menentukan tumbuh kembang mereka di masa anak-anak.

Rapid Colorimetric Sensor Based on Gold Nanoparticles Functionalized 4-Amino-3-hydrazino-5-mercapto-1,2,4-triazole for Cortisol Detection in Saliva Sample Hanim Istatik Badi'ah; Ni Nyoman Tri Puspaningsih; Ganden Supriyanto; Nasronudin Nasronudin
Indonesian Journal of Chemistry Vol 23, No 4 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.80874

The rapid, simple, and selective colorimetric sensing method of cortisol has been successfully developed using AuNPs modified with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AuNPs-AHMT). The principle of this method is based on the color change from wine red to purple (redshift) when AuNPs-AHMT interacts with cortisol. The hydrogen bonding between the hydroxyl group from cortisol and the amine group from AHMT induces the aggregation of AuNPs. The modification of the AuNPs surface with AHMT aims to increase its stability. The properties of AuNPs and AuNPs-AHMT were characterized by UV-vis spectrophotometer. The interaction between AuNPs-AHMT and cortisol was studied by UV-vis and FTIR spectroscopies. The proposed method was optimized and validated. Au(III) was reduced to AuNPs at an optimum NaBH4 concentration of 1.0 mM. Validation of the proposed method showed good analytical performance with linearity from 1.0–50.0 nM, accuracy 91.07–102.77%, intra-day precision < 2.22% and inter-day precision < 2.17%, detection limit 0.76 nM, quantification limit 2.54 nM, and sensitivity 0.0112 nM/mL. The proposed method also showed good selectivity with the presence of some interferences in the sample. The proposed method was successfully applied for the determination of cortisol in the saliva by the standard addition method with acceptable recovery.

Chitosan as a Capping Agent of Silver Nanoparticles Badi'ah, Hanim Istatik
Indonesian Journal of Chemical Research Vol 9 No 1 (2021): Edition for May 2021
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.9-han

Silver nanoparticles have been developed in many applications because of their optical and reactivity properties. One of the disadvantages of silver nanoparticles is their low level of stability because their surface is easy to aggregate. It is necessary to have other materials such as chitosan as a capping agent on the surface of silver nanoparticles to prevent aggregation. This study aimed to determine the ability of chitosan as a capping agent for silver nanoparticles. The ability of chitosan was evaluated based on the stability test and characterization using a UV-Vis, PSA, and FTIR spectrophotometer. The silver nanoparticles formed producing a yellow color with a wavelength of 401 nm and a size of 13.48 nm. The volume of chitosan that gave optimal results in stabilizing silver nanoparticles was 2.0 mL.

Sintesis dan Karakterisasi Nanopartikel Tembaga dengan Bioreduktor Limbah Kulit Buah Naga (Hylocereus costaricensis) Qomariyah, Ani; Istatik Badi'ah, Hanim
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 9 No. 2 (2024): Volume 9, ISSUE 2,2024
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol9.iss2.art3

The green chemistry technique was carried out for the very first time to synthesize copper nanoparticles (Cu-NPs) by applying CuSO4 as a precursor and red dragon fruit peel extract as a reducing agent. The extracting procedure of red dragon fruit peel was conducted by maceration technique with solvent of methanol. Cu-NPs were produced through green chemistry by the reduction method. Cu-NPs were prepared by combining CuSO4 solution with red dragon fruit peel extract in the compositions of 1:1, 1:2, 1:3, 1:4, and 1:5. The successfully synthesized Cu-NPs were analyzed using Scanning Electron Microscopy (SEM), Particle Size Analyzer (PSA), and UV-Visible Spectrophotometer. The variation in the volume of reducing agent affect the maximum wavelength produced. The optimum concentration of reducing agent (1:5) shows the highest intensity at 650 nm. The optimum pH for the synthesis of copper nanoparticles (Cu-NPs) with dragon fruit extract was 6. Cu-NPs were stable at 20 minutes to 1 hour. From the SEM figure of Cu-NPs, it can be observed that the particles are of round shape. Volume or weight analyzes of Cu-NPs employing PSA provided particle diameters between 80 and 120 nm with an approximate distribution of 100 nm.

Edukasi Analisis Kesehatan tentang Keamanan Makanan Ringan dan Minuman Kemasan pada Santri Pondok Pesantren Queen Al Ishlah Banyuwangi Qomariyah, Ani; Badi'ah, Hanim Istatik
Aksiologiya: Jurnal Pengabdian Kepada Masyarakat Vol 7 No 3 (2023): Agustus
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/aks.v7i3.12792

Di lingkungan Pondok Pesantren, pada jam istirahat biasanya para santri membeli jajanan dan minuman di kantin atau koperasi Ponpes. Para santri yang kebanyakan usia anak sekolah, merupakan konsumen utama jajanan, seringkali tidak faham dan tidak memperhatikan keamanan makanan dan minuman yang dibelinya. Mereka cenderung memilih snack dan soft drink sesuai kesukaannya, tanpa memperhatikan dan mempertimbangkan kesehatan dan kebersihannya. Ponpes Queen Al-Ishlah yang berlokasi di Desa Tapanrejo Kecamatan Muncar Kabupaten Banyuwangi ini seperti lembaga-lembaga pada umumnya yang memiliki kantin dan koperasi. Namun, kondisi yang ada belum dapat dikatakan sebagai kantin yang sehat. Kegiatan Pengabdian kepada Masyarakat ini bertujuan untuk meningkatkan pengetahuan serta mengubah kebiasaan jajan pada anak-anak. Kegiatan berupa edukasi dengan metode penyuluhan selama 2 hari dengan jumlah santri 20 orang. Tim pelaksana terdiri dari 2 orang dosen dan dibantu 3 orang mahasiswa dari STIKES Banyuwangi. Pelaksanaan kegiatan dengan metode hybrid melalui Zoom dan offline di lokasi Pondok Pesantren. Hasil dari kegiatan ini, terungkap bahwa pengetahuan para santri terhadap keamanan snack dan soft drink tergolong rendah. Perhatian orang tua serta guru di Ponpes terhadap budaya jajan santri sangat diperlukan. Konsep pemahaman yang benar harus ditanamkan sejak dini agar dapat menentukan tumbuh kembang mereka di masa anak-anak.

Potensi Nanopartikel Emas (AuNp) sebagai Sensor Kolorimetri untuk Deteksi Asam Sialat Istatik Badi’ah, Hanim; Qomariyah, Ani
Paradigma: Jurnal Filsafat, Sains, Teknologi, dan Sosial Budaya Vol. 29 No. 4 (2023): Paradigma: Jurnal Filsafat, Sains, Teknologi, dan Sosial Budaya
Publisher : Universitas Insan Budi Utomo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33503/paradigma.v29i4.478

Gold nanoparticles (AuNp) have LSPR absorption at visible wavelengths, which can be used for colorimetric sensors. The sialic acid colorimetric sensor using AuNp is an analysis based on the color change when there is an interaction between AuNp and the sialic acid analyte. The research method was carried out by synthesizing AuNp and then characterizing it using a UV-Vis spectrophotometer. The synthesis results were then used to detect sialic acid in serum samples. The success of AuNp synthesis was marked by the formation of a red AuNp colloid with a maximum wavelength of 518 nm. AuNp has potential as a colorimetric sensor for sialic acid and is characterized by a color change in the AuNp solution from red to purple. Apart from that, the spectrophotometry results show that there is a new peak at a wavelength of 655 nm. Next, AuNp was used for the detection of sialic acid in serum samples. The results of the analysis of sialic acid in serum samples showed that the recovery value was 105.6%.

Fabrication of Hydrophobic Graphene-Cellulose Composite Paper Using Rice Husk Ash Silica Sariwahyuni; Herlina Rahim; Hanim Istatik Badi'ah; Andi Haslinah; Mega Fia Lestari
Science Journal Get Press Vol 2 No 4 (2025): October, 2025
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v2i4.233

This study presents the fabrication and characterization of a sustainable graphene–cellulose composite paper reinforced with rice husk ash (RHA)–derived amorphous silica. Silica was extracted via alkaline leaching–acid precipitation, yielding a porous, high-purity amorphous phase well-suited for reinforcement. Composite papers were prepared by incorporating varying loadings of graphene nanoplatelets (0.5–2 wt%) and silica (5–15 wt%) into cellulose pulp, followed by ultrasonication, vacuum filtration, and hot pressing. Structural and morphological analyses (FTIR, XRD, SEM) confirmed effective dispersion and strong filler–matrix interactions. The incorporation of graphene and silica significantly enhanced surface hydrophobicity, raising the water contact angle from 62.5° for neat cellulose to 152.7°—indicative of a near-superhydrophobic state. Mechanical testing revealed an optimal formulation (1 wt% graphene + 10 wt% silica) that improved tensile strength by 42% and Young’s modulus by 36% compared to neat cellulose. Higher filler concentrations slightly reduced tensile strength due to filler agglomeration. This work demonstrates a valorization pathway for low-cost agricultural residues to produce eco-friendly composite materials with superior mechanical and surface properties, suitable for applications in packaging, filtration, or protective coatings.

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