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Journal articles on the topic 'Maximum absorbance'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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1

Brewster, Jeffrey D., and James L. Anderson. "On Absorbance Measurements in Spatially Inhomogeneous Fields." Applied Spectroscopy 43, no. 4 (1989): 710–14. http://dx.doi.org/10.1366/0003702894202427.

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The measured absorbance of a spatially inhomogeneous sample may be strongly affected by the relative spatial distribution of the absorbing medium and the optical beam. The measured absorbance is, in general, not the average of local absorbances across the beam, except when the maximum range of local absorbance values across the entire field is small (<0.1 AU). The measured transmittance of an optically inhomogeneous field is equal to the average transmittance only if incident intensity is everywhere uniform. The general problem is outlined and is illustrated by examples of transient spectro

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2

Bingjian, Yuan. "Application of the Maximum Sensitivity of the Photometric Method." Science Discovery 13, no. 2 (2025): 33–38. https://doi.org/10.11648/j.sd.20251302.13.

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The method of high content determination of photometry was optimized in the way of maximum sensitivity:1) Under strictly observing the “condition of repeatable measurement”, make the “calibration curve” of the method used .The line joining its upper and lower end points is to be taken as the &quot;calibration line&quot; for the sample, the equation of which is the &quot;two point form ”of the geometry, which indicating that &quot;the change △A in the absorbance of a substance, is directly proportional to the change △C in its substance content, i.e. △A=k△C&quot;, and the sen

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3

Wu, Dan, and Kai Xiao Zhang. "The Linear Relationship between Concentrations and UV Absorbance of Nitrobenzene." Advanced Materials Research 955-959 (June 2014): 1376–79. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.1376.

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This paper researched the linear relationship between UV absorbance and concentrations of nitrobenzene. It used the UV-1700 UV/VIS spectroscopy to get the absorbance diagram and analyze it. Then it calculated the absorbance of maximum absorption peak and the absorbance integration in a wavelength interval. There is a linear relationship between absorbance and concentration, the correlation coefficient is 0.981 of the maximum absorption peaks and the concentrations, and the largest correlation coefficient between concentrations and the integration of absorbance is 0.995 with the wavelength inte

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Lumbessy, Mirna, Jemmy Abidjulu, and Jessy J. E. Paendong. "Uji Total Flavonoid Pada Beberapa Tanaman Obat Tradisonal Di Desa Waitina Kecamatan Mangoli Timur Kabupaten Kepulauan Sula Provinsi Maluku Utara." Jurnal MIPA 2, no. 1 (2013): 50. http://dx.doi.org/10.35799/jm.2.1.2013.766.

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Penelitian ini bertujuan untuk menguji total kandungan flavonoid pada beberapa tanaman obat tradisional. Penentuan kandungan total flavonoid dilakukan dengan menggunakan metode etanol – HCl, sedangkan analisis flavonoid menggunakan Metode spektrofotometeyr UV-VIS . Hasil yang diperoleh menunjukan kandungan total flavonoid pada tanaman ketepeng cina (Cassia alata L) sebesar 26.8633 mg/mL , iler (Coleus scutellariodes L Benth) sebesar 14.425 mg/mL , rumput teki (Cyperus rotundus L) sebesar 6.505 mg/mL, pegagan (Centella asiatica) sebesar 3.816 mg/mL, rumput mutiara (Oldenlandia corymbosa) sebesa

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García Bermúdez, G., V. C. Chappa, M. F. del Grosso, and R. O. Mazzei. "Stopping power dependence of maximum grafting yield and absorbance measurements." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 266, no. 12-13 (2008): 3063–66. http://dx.doi.org/10.1016/j.nimb.2008.03.163.

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6

Mardison, NFN, Usman Ahmad, NFN Sutrisno, and Slamet Widodo. "KARAKTERISASI ABSORBANSI LARUTAN DAN PENDUGAAN DERAJAT SOSOH BERAS BERDASARKAN ABSORBANSI PADA SPEKTRUM ULTRA- VIOLET." Jurnal Penelitian Pascapanen Pertanian 15, no. 1 (2019): 43. http://dx.doi.org/10.21082/jpasca.v15n1.2018.43-51.

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<p>Teknologi non-destruktif seperti penggunaan gelombang ultra-violet (UV) dapat dijadikan sebagai alternatif dalam menentukan kualitas beras sosoh. Pengembangan metode pengukuran dan karakterisasi beras sosoh berdasarkan absorbansi spektrumnya pada daerah UV sangat berpotensi dalam evaluasi kualitas beras secara non-destruktif. Penelitian ini bertujuan untuk menganalisis spektrum absorbansi UV pada beberapa varietas beras dengan tingkat penyosohan bervariasi dan menentukan hubungan derajat sosoh beras varietas Ciherang dengan spektrum absorbansi UV dari larutan beras dalam pelarut n-hek

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Putri, Yulia Eka, and Mulda Muldarisnur. "Pengaruh Frekuensi Vibrasi Terhadap Kualitas Lapisan Tipis Opal yang Disintesis dengan Metode Deposisi Horizontal." Jurnal Fisika Unand 9, no. 1 (2020): 9–16. http://dx.doi.org/10.25077/jfu.9.1.9-16.2020.

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Telah dilakukan sintesis dan karakterisasi lapisan tipis opal menggunakan metode deposisi horizontal dengan penambahan frekuensi vibrasi. Sintesis dilakukan pada suhu ruang dengan variasi frekuensi vibrasi 75 Hz, 200 Hz, 300 Hz, dan 400 Hz menggunakan speaker dalam keadaan volume tetap. Karakterisasi dilakukan menggunakan Mikroskop Optik, SEM (Scanning Electron Microscopy) dan Spektrofotometer UV-Vis. Hasil mikroskop optik menunjukkan permukaan sampel dengan frekuensi vibrasi rendah lebih homogen dan tebal dibandingkan frekuensi vibrasi tinggi. Hasil SEM menunjukkan lapisan multilayer terbentu

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8

Angelats-Silva, Luis M., David Asmat-Campos, Henry León-León, Kevin A. Wilkinson, Daniel A. Sánchez-Vaca, and Alcides López-Milla. "Synthesis of Colloidal Gold Nanorods with Plasmon Absorbance Wavelength in the Near Infrared Region." MRS Advances 1, no. 30 (2016): 2181–86. http://dx.doi.org/10.1557/adv.2016.486.

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ABSTRACTWe report preparation and characterization of colloidal gold nanorods (AuNR) with plasmon absorbance over 950 nm and an aspect ratio of 7.2 by tuning silver nitrate concentration and the CTAB/BDAC ratio during growth. Samples were analyzed by scanning transmission electron microscopy, X-ray diffraction, UV-vis absorption spectroscopy and measurement of zeta potential. Addition of 170 μM silver nitrate to the CTAB-containing reaction mixture allowed preparation of AuNRs with a maximum absorbance peak at 941.8 nm and a yield around 96%. Optimization of the BDAC/CTAB ratio allowed for a f

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9

Mohamed, Ashraf A. "Kinetic and maximum-absorbance spectrophotometric methods for the determination of olanzapine." Monatshefte für Chemie - Chemical Monthly 139, no. 9 (2008): 1005–10. http://dx.doi.org/10.1007/s00706-008-0894-4.

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10

AL-Jalali, Muhammad Ahmad. "P, Q, and R branches of the pure oxygen A-band at 762 nm." International Journal of Physical Research 13, no. 1 (2025): 12–22. https://doi.org/10.14419/h3rchs22.

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Oxygen A-band absorption spectra exhibit interference between O2 monomer (with a discrete line at 762 nm) and O2 dimol (which ‎also exhibits a band spectrum at 762 nm) absorption. Analysis of the absorbance spectrum between 750 nm and 770 nm reveals ‎P, Q, and R branches, characteristic of rovibrational transitions. Pure oxygen spectra were analyzed at pressures ranging from 1 to 25 bar and at temperatures of 298 K, 323 K, 348 K, and 373 K using advanced data analysis methods. Integrated absorbance, Gaussian and ‎Lorentzian full width at half maximum height (FWHM), and maximum absorbance peak

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Rakić, Violeta, Milena Miljković, Vojkan Miljković, and Nemanja Stančić. "SPECTROPHOTOMETRIC DETERMINATION OF COPPER COMPLEXES OF CHLOROPHYLLINS (E141ii)." International Conference on Technics, Technologies and Education, ICTTE 2019 (2019): 438–44. http://dx.doi.org/10.15547/ictte.2019.07.012.

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In this study, the water-soluble green food colorant copper complexes of chlorophyllins, E141ii, as one of the most popular within the food industry was investigated. First, the spectroscopic parameters, absorbance maximum, λmax-vis, and molar absorptivities, ε, of E141ii dye were determined. The impact of the presence of aspartame, citric acid and vitamin C on the change in the positions of the absorbance maximum and change of its intensity in the visible range of the E141ii spectra also was investigated. Recorded absorption spectra was show that this dye had two absorbance maxima. The averag

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12

Isaksson, Tomas, and Peter R. Griffiths. "Optimal Absorbance for Transmission or Reflection Spectra Measured under Conditions of Constant Detector Noise in the Presence of Stray Radiation." Applied Spectroscopy 56, no. 7 (2002): 916–19. http://dx.doi.org/10.1366/000370202760171608.

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The signal-to-noise ratio ( S/N) for absorption spectrometers can be expressed as absorbance/absorbance noise ( Am/ SAm), where Am is the measured absorbance and Smm is the standard deviation in Am, or as concentration/concentration noise ( c/sc) calculated from Beer's law. For measurements made under ideal conditions, Am/ SAm. However, when stray radiation, or an analogous phenomenon, such as detector nonlinearity in FT-IR measurements or surface reflection in diffuse reflection spectrometry, contributes to the spectrum, C/ Sc ≠ Am/ SAm. It is known that the optimum value of Am/ SAm in the ab

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CAN, Ziya, Büşra KESKİN, Ayşem ARDA, Erol ERÇAĞ, and Mustafa Reşat APAK. "Magnetite nanoparticles−based hydroxyl radical scavenging activity assay of antioxidants using N, N-dimethyl-p-phenylenediamine probe." TURKISH JOURNAL OF CHEMISTRY 44, no. 5 (2020): 1366–75. http://dx.doi.org/10.3906/kim-2006-9.

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Excessive amounts of reactive oxygen species (ROS), unless counterbalanced by antioxidants, can cause cellular damage under oxidative stress conditions; therefore, antioxidative defenses against ROS must be measured. With the development of nanotechnology, nanoparticles have found numerous applications in science, health, and industries. Magnetite nanoparticles (Fe3O4:MNPs) have attracted attention because of their peroxidase-like activity. In this study, hydroxyl radicals (•OH) generated by MNPs-catalyzed degradation of H2O2 converted the N,N-dimethyl-p-phenylenediamine (DMPD) probe into its

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14

Lórenz-Fonfría, Víctor A., and Esteve Padrós. "Maximum Entropy Deconvolution of Infrared Spectra: Use of a Novel Entropy Expression without Sign Restriction." Applied Spectroscopy 59, no. 4 (2005): 474–86. http://dx.doi.org/10.1366/0003702053641504.

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Absorbance and difference infrared spectra are often acquired aiming to characterize protein structure and structural changes of proteins upon ligand binding, as well as for many other chemical and biochemical studies. Their analysis requires as a first step the identification of the component bands (number, position, and area) and as a second step their assignment. The first step of the analysis is challenged by the habitually strong band overlap in infrared spectra. Therefore, it is useful to make use of a mathematical method able to narrow the component bands to the extent to eliminate, or

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15

Hawryshyn, Craig W., Theodore J. Haimberger, and Mark E. Deutschlander. "Microspectrophotometric measurements of vertebrate photoreceptors using CCD-based detection technology." Journal of Experimental Biology 204, no. 14 (2001): 2431–38. http://dx.doi.org/10.1242/jeb.204.14.2431.

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SUMMARY We have developed a charge-coupled-device (CCD)-based microspectrophotometer (MSP) system and provide the first report on the successful employment of this technology to measure the spectral absorbance properties of vertebrate photoreceptors. The principal difference between the CCD-based MSP system and wavelength-scanning MSP systems, commonly used in vision biology, is that a short duration (800–1200ms), broad-spectrum flash is employed rather than ascending and descending wavelength scanning. Data acquisition is thus significantly faster, with the added possible advantages of less v

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Goblet, Madeleine, Farnaz Matin, Thomas Lenarz, and Gerrit Paasche. "Optical absorbance of the tympanic membrane in rat and human samples." PLOS ONE 16, no. 7 (2021): e0254902. http://dx.doi.org/10.1371/journal.pone.0254902.

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Chronic infections are often connected to biofilm formation. In presence of implants, this can lead to loss of the implant. Systemic or local application of drugs is relatively ineffective in case of biofilm formation. One technique to provide antibacterial properties on demand is the antibacterial photodynamic therapy (aPDT). Using this technique, these properties can be “switched on” by light illumination. In the middle ear with the semitransparent tympanic membrane, it might be possible in future to activate the antibacterial effect without opening the membrane. Therefore, we investigated t

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17

McEwen, D. J., C. A. Drumm, and J. C. Smith. "Improved Sample Holder for Internal Reflection Infrared Spectroscopy." Applied Spectroscopy 43, no. 8 (1989): 1432–35. http://dx.doi.org/10.1366/0003702894204344.

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A sample clamp and prism holder have been made to improve the contact between sample and prism surfaces for quantitative internal reflection infrared spectroscopy. The efficacy of the clamp design was checked with several automotive paint samples by measuring the clamp pressure at which maximum band absorbance and constant absorbance ratios were achieved.

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18

Shealy, Dana B., Rolf Lohrmann, Jerry R. Ruth, et al. "Spectral Characterization and Evaluation of Modified Near-Infrared Laser Dyes for DNA Sequencing." Applied Spectroscopy 49, no. 12 (1995): 1815–20. http://dx.doi.org/10.1366/0003702953965858.

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Several derivatives of IR-144, a commercially available near-infrared (near-IR) laser dye, have been synthesized with different moieties, which produce bathochromic shifts of the absorbance maximum without affecting their fluorescence emission spectrum. With this capability, the absorbance maximum of the dye can be adjusted to coincide with the maximum output wavelength of various semiconductor laser diodes. This capability allows compatibility with a multidye fluorescence system that has different excitation sources but a common near-IR detector. The utility of IR-144 derivatives with an abso

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19

Panigrahi, Suraj Kumar, and Ashok Kumar Mishra. "Study on the dependence of fluorescence intensity on optical density of solutions: the use of fluorescence observation field for inner filter effect corrections." Photochemical & Photobiological Sciences 18, no. 2 (2019): 583–91. http://dx.doi.org/10.1039/c8pp00498f.

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Poojitha, Ravipati, Arpita Shrivastav, Neeraj Shrivastava, et al. "Inhibitory effect of spices on beta lactamase enzyme of resistant bacteria isolatedfrom milk of healthy cattle." Indian Journal of Dairy Science 76, no. 5 (2023): 466–72. http://dx.doi.org/10.33785/ijds.2023.v76i05.007.

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Present study was undertaken to observe the effect of spices on the extended Spectrum beta lactamase enzyme of ESBL Producing Enterobacteriaceae Group of Bacteria isolated from healthy cattle milk. Out of 100 samples collected randomly from various dairy farms located at the different areas of Rewa 14samples characterized by the phenotypic standard methods were found to be ESBL positive giving a prevalence rate of 14%.Inhibitory potential and per cent inhibition of beta lactamase enzyme were observed against dry powder of Methi seeds(Trigonella foenum-graecum), dry zinger, (Zingiberofficinale)

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Masdor, Noor Azlina, Y. Noor Aseha, K. Noorzila, Mohd Yunus Abd Shukor, R. I. Mohammad, and I. Zamri. "Comparison of the sensitivity and cross-reactivity between heat-killed and formalin-killed cells during the development of indirect competitive ELISA for the detection of Salmonella Typhimurium." Journal of Environmental Bioremediation and Toxicology 2, no. 1 (2014): 23–27. http://dx.doi.org/10.54987/jebat.v2i1.144.

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Newer discovery of Salmonella strains warranted the development of newer ELISA system. Theaim of this works is to develop a sensitive and simple indirect ELISA for the detection ofSalmonella Typhimurium using formalin- and heat-killed cells as immunogens. The parameters ofthe resultant calibration curve for the formalin-killed cells (FKC) were minimum absorbance of0.101Â± 0.011, maximum absorbance of 2.804Â± 0.020, slope parameter of 1.197, while c, theconcentration that results in 50% response was 4.22 x 106 CFU/ml. The LOD and LOQ were19,300 and 52,700 CFU/mL, respectively. The parameters of

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Walmsley, T. A., M. H. Abernethy, and H. P. Fitzgerald. "Effect of daylight on the reaction of thiols with Ellman's reagent, 5,5'-dithiobis(2-nitrobenzoic acid)." Clinical Chemistry 33, no. 10 (1987): 1928–31. http://dx.doi.org/10.1093/clinchem/33.10.1928.

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Abstract The reaction of 5,5'-dithiobis(2-nitrobenzoic acid) (DTNB, Ellman's reagent) with thiols is sensitive to daylight, in particular to ultraviolet radiation at wavelengths around 325 nm. Exposure to light at the absorbance maximum of the yellow product (the thionitrobenzoate ion) at 410 nm had no effect on the reaction. The light-sensitive species is apparently the DTNB, because a spectral-irradiation experiment showed that the wavelength of light that produced the maximum rate of absorbance change coincided with the peak absorbance of DTNB, and it was well separated from the thionitrobe

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Özdemir, Kadir, İsmail Toröz, and Vedat Uyak. "Assessment of Trihalomethane Formation in Chlorinated Raw Waters with Differential UV Spectroscopy Approach." Scientific World Journal 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/890854.

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In this study, the changes in UV absorbance of water samples were characterized using defined differential UV spectroscopy (DUV), a novel spectroscopic technique. Chlorination experiments were conducted with water samples from Terkos Lake (TL) and Büyükçekmece Lake (BL) (Istanbul, Turkey). The maximum loss of UV absorbance for chlorinated TL and BL raw water samples was observed at a wavelength of 272 nm. Interestingly, differential absorbance at 272 nm (ΔUV272) was shown to be a good indicator of UV absorbing chromophores and the formation of trihalomethanes (THMs) resulting from chlorination

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Tran, Cat-Van, and Jay R. Vargas. "Determination of Specific Absorbance (A¦) for Six Psychoactive Drugs Encountered in Forensic Toxicology." Journal of Analytical Toxicology 44, no. 6 (2020): 531–40. http://dx.doi.org/10.1093/jat/bkz091.

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Abstract Specific absorbance (A¦) is defined as the maximum absorbance of a 1% solution over a 1-cm path length measured via spectroscopy. Finding a reliable value for specific absorbance for a drug provides an important tool for the quantitative verification of concentration of analytical standards. Although many new drugs have emerged within the last ten years, many either do not have a reliable value for A¦, or a value simply has never been published. This work focused on determining the quantitative value of the specific absorbance of six psychoactive drugs using ultraviolet-visible spectr

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Kumbhar, S. C., and V. R. Salunkhe. "U.V.Spectrophotometric Method development for Capecitabine Eudragit and Chitosan based Microspheres and its Validation." Indian Journal of Pharmaceutical and Biological Research 1, no. 03 (2013): 32–38. http://dx.doi.org/10.30750/ijpbr.1.3.7.

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A simple, rapid, accurate, precise, and economic Spectrophotometric method for formulated microspheres dosage form has been developed. Capecitabine shows absorbance maximum at different wavelength in different solvents, so absorbance was measured and the same wavelengths used for the estimation of Capecitabine in respective solvents. Capecitabine obey the beer lamberts’ law. Method is validated according to ICH guideline and carried out for analysis of Capecitabine

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Rastuti, Undri, and Purwati Purwati. "UJI AKTIVITAS ANTIOKSIDAN HASIL DEGRADASI LIGNIN DARI SERBUK GERGAJI KAYU KALBA (Albizia falcataria) DENGAN METODE TBA (Thio Barbituric Acid)." Molekul 5, no. 2 (2010): 98. http://dx.doi.org/10.20884/1.jm.2010.5.2.82.

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Antioxidants are compounds that can delay, retard or inhibit the oxidation reaction. Lignin is a natural polymer consisting of monomeric substituted phenols. Wood lignin degradation Kalba (Albizia falcataria) yields substituted phenol. The purpose of this study was to test the antioxidant activity of compounds of lignin degradation products Kalba using TBA (Thiobarbituric Acid). Wood lignin degradation products Kalba tested antioxidant activity using the TBA method. Phase test phase of this antioxidant activity is sample preparation, determination of the maximum wavelength, determination of eq

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Lu, Keru, Zhilin Li, and Man Sing Wong. "Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration." Sustainability 15, no. 1 (2022): 138. http://dx.doi.org/10.3390/su15010138.

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The sulphur dioxide (SO2) concentration can be monitored via its absorbance in the ultraviolet (UV) region. To address the absence of a systematic study on the UV absorbance of varying SO2 concentrations, a multispectral imaging method was implemented in the present study. SO2 concentrations and various environmental conditions were controlled by a purpose-built environmental control system with a light path of 4.2 m. Five narrow-band-pass filters in front of a UV camera were used to implement multispectral imaging. Regression models of the relationship between UV absorbance and SO2 concentrat

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Starova, Viktoriia, Mykhailo Ianchuk, Olga Zaporozhets та Anne-Marie Caminade. "Physico-chemical properties of β-diketone phosphorus-containing dendrimers". French-Ukrainian Journal of Chemistry 5, № 2 (2017): 128–35. http://dx.doi.org/10.17721/fujcv5i2p128-135.

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Protolytic, absorbance and fluorescence properties of β-diketone phosphorus-containing dendrimers based on cyclotriphosphazene core were studied. Dendrimer solutions in acetone are characterized by intense absorbance band at ≈ 340 nm (ε340≈ 8.5·104L/mol·сm) and fluorescence band with maximum at 440 nm. Position of these maxima does not change in various solvents, unlike the bands of monomer β-diketone. It was found that dendrimer aggregation is accompanied by appearance of a second absorbance band ε400≈ 4.5·103L/mol·сm, by red shift of emission spectra ∆λ ≈ 10 nm and also by decrease in surfac

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Latheeshjlal, L., P. Parthiban, V. Alagarsamy, M. Sunil, J. Vaidhya Mahul, and T. Rama Mohan. "Spectrophotometric Determination of Lorsartan Potassium and its Dosage Form by Bromothymol Blue and Phosphate Buffer." E-Journal of Chemistry 7, no. 1 (2010): 320–24. http://dx.doi.org/10.1155/2010/869598.

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Simple, rapid and accurate, spectrophotometric method for the determination of losartan potassium by using bromothymol blue as a chromogen and phosphate buffer solution (pH 3-4) as a diluting agent was developed. The developed colour shows maximum absorbance at 620 nm and it was observed that the absorbance of different dilution from the plots the calibration curve between the concentrations in x-axis, absorbance at y-axis. The recovery studies were also carried out to ensure the reproducibility and repeatability. This recovery studies shows between 96.82-100.08% for the different formulation.

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Harizal, Harizal, Jumina Jumina, and Tutik Dwi Wahyuningsih. "C-4-metoksifenilkaliks[4]pirogalaril Dodekasinamat: Sintesis dan Uji Pendahuluan sebagai Bahan Aktif Tabir Surya." Journal of Pharmaceutical and Health Research 3, no. 3 (2022): 95–101. http://dx.doi.org/10.47065/jharma.v3i3.2819.

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Synthesis and preliminary study of C-4-methoxyphenyl[4]pyrogallaryl dodecacinnamate were successfully performed. Synthesis of target molecule was conducted in two steps including preparation of calix[4]pyrogallarene derivative, and O-cinnamoylation of the calix[4]pyrogallarene. The product obtained was pre-evaluated as sunscreen active compound through UV spectroscopy (UV absorbance profile, maximum wavelength, and molar absorption coefficient), and photostability tests. The results of evaluation indicated dominant absorbance in UVC/UVB region with exceptionally high molar absorption coefficie

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Miladina, Rizka Aziza, Maulana Eka, Mudjirahardjo Panca, and Jumiadi. "Performance improvement of dye-sensitized solar cells by using natural chlorophyll and anthocyanin dyes." Performance improvement of dye-sensitized solar cells by using natural chlorophyll and anthocyanin dyes 29, no. 3 (2023): 1290–99. https://doi.org/10.11591/ijeecs.v29.i3.pp1290-1299.

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Natural dye-sensitized solar cells (DSSC) have gained so much attention in recent years due to its low-cost fabrication process, ease of fabrication, and environmentally friendly. In order to improve the DSSC performance, the absorbance spectral of dyes must reach the maximum visible spectrum values. The combination of two dyes with different absorbance spectra can be utilized to expand the absorbance spectral. Here, we demonstrated the combination of natural chlorophyll and anthocyanin dyes from cassava leaves and black sticky rice, respectively, to enhance the DSSC performance. Our findings

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Jyothsna, Modugula 1. *. Dr. Manohar Babu. S. 2. Manohar reddy. J. 1. and Sushma R. 1. "A STABILITY INDICATING METHOD DEVELOPMENT AND VALIDATION OF CLOZAPINE BY UV SPECTROSCOPIC METHOD IN BULK AND TABLET DOSAGE FORM." Journal of Scientific Research in Pharmacy 8, no. 5 (2019): 48–53. https://doi.org/10.5281/zenodo.2677994.

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<strong><em>ABSTRACT</em></strong> <strong><em>Objective:</em></strong><em> To develop a stability indicating method development and validation of Clozapine by UV spectroscopic method in bulk and tablet dosage form and validate a simple, precise and cost-effective UV spectrophotometric method for the estimation of Clozapine according to the ICH Q2 (R1) guideline. </em> <strong><em>Methods:</em></strong><em> standard Clozapine solution was scanned over UV-Visible range for its wavelength of maximum absorbance. Various calibration standards of Clozapine were prepared and absorbance was recorded

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Fakhri, Muhammad, and Nasrullah B. Arifin. "KARAKTERISTIK PERTUMBUHAN Tetraselmis sp. DAN Nannochloropsis sp." Jurnal Perikanan Universitas Gadjah Mada 18, no. 1 (2016): 15. http://dx.doi.org/10.22146/jfs.10749.

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Monitoring of microalgae growth (Tetraselmis sp. and Nannochloropsis sp.) is one of the essential factors in fish and shrimp cultures. The purpose of this study was to determine the growth characteristics of Tetraselmis sp. and Nannochloropsis sp. by measuring optical density using spectrophotometry method. Absorbance of 600 nm was used for both species. The results showed that the maximum growth was achieved at day 6 for both microalgae with OD value of 1.734±0.013 and 1.329±0,002 for Tetraselmis sp. and Nannochloropsis sp., respectively. Tetraselmis sp. had a maximum growth rate of 0.74/day

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Dipannita, Naskar Dr. Subharota Majumdar Banhishikha Kar. "UV Spectrophotometric Method Development and Validation for the Determination of Fluoxetine Hydrochloride in Bulk Drug and Commercial Formulation." International Journal of Pharmaceutical Sciences 3, no. 5 (2025): 4827–34. https://doi.org/10.5281/zenodo.15547480.

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The simple and rapid spectrophotometric technique has been developed to measure and validate the absorbance of antidepressant drug fluoxetine hydrochloride. This study's objective is to use UV spectroscopy to precisely and accurately estimate the maximum wavelength of the bulk drug and the pH at which the bulk drug exhibits the highest absorbance. According to Beer’s law concentration range of bulk drug and sample is 2-20µg/ml in buffer at pH 1.2, 6.8 and 7.4 respectively. The ℷmax of the bulk drug is 226nm. The linear regression equations of bulk drug were determined to be y = 00.

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Larisa, Alagić-Džambić, Gjuraj Mergime, Dacić Minela, Hukić Minela, and Džambić Mirsad. "UV VIS method of estimation for Glimepiride in Tablets." Chemistry Research Journal 8, no. 6 (2023): 1–4. https://doi.org/10.5281/zenodo.11390450.

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<strong>Abstract </strong> A simple spectrophotometric method was developed and validated for determination of Glimepiride in pharmaceutical products. The method was based using 0.1 mol / L sodium hydroxide as solvent. The absorbance maximum was at 235 nm, 233 nm, and 237 nm. The correlation coefficients on three absorbance point were r=0.9989. The method was validated, and results obtained for the assay of five different brands of Glimepiride tablets. The proposed method was successfully applied to the spectrophotometric determination Glimepiride.

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Warlina, Lenny, Ilim ., and Wasinton Simanjuntak. "Pengolahan Limbah Cair Hotel Dengan Kombinasi Metode Elektrokoagulasi Dan Adsorpsi Menggunakan Karbosil." Jurnal Sylva Lestari 1, no. 1 (2014): 85. http://dx.doi.org/10.23960/jsl1185-92.

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This study was carried out to investigate treatment of hotel wastewater using a combination of electrocoagulation and adsorption using carbosil prepared from rice husk with pyrolysis method. Electrocoagulation was applied with the aim to remove natural organic matter in the sample, using aluminim as electrodes, with the particular purpose to study the effect of potentials.The treated water was then subjected to adsorption process at different contact times and the performance of the process was evaluated in term of the reduction of the absorbance at maximum wavelength.The performance of the me

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Ilyas, Irfan, Muhammad Imam Surya, Intani Quarta Lailaty, Frisca Damayanti, and Tri Rini Nuringtyas. "Metabolite Profile and Antibacterial Potential of Leaf And Stem Extract Castanopsis tungurrut (Blume) A.DC. against Escherichia coli and Staphylococcus aureus." BIO Web of Conferences 75 (2023): 03002. http://dx.doi.org/10.1051/bioconf/20237503002.

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Giving antibiotics or antibacterial drugs is one of the therapeutic strategies used to overcome the problem of infectious diseases caused by microorganisms. The emergence of bacteria that are resistant to various types of antibacterials can delay the recovery period from infectious disorders and cause treatment with antibiotics to become ineffective to use. For this reason, research to find new alternative antibacterial drugs from natural materials needs to be carried out. This study aims to determine the potential of Castanopsis tungurrut leaf and stem extracts as natural antibacterials again

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Rizka Aziza, Miladina, Eka Maulana, Panca Mudjirahardjo, and Jumiadi Jumiadi. "Performance improvement of dye-sensitized solar cells by using natural chlorophyll and anthocyanin dyes." Indonesian Journal of Electrical Engineering and Computer Science 29, no. 3 (2023): 1290. http://dx.doi.org/10.11591/ijeecs.v29.i3.pp1290-1299.

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<span lang="EN-US">Natural dye-sensitized solar cells (DSSC) have gained so much attention in recent years due to its low-cost fabrication process, ease of fabrication, and environmentally friendly. In order to improve the DSSC performance, the absorbance spectral of dyes must reach the maximum visible spectrum values. The combination of two dyes with different absorbance spectra can be utilized to expand the absorbance spectral. Here, we demonstrated the combination of natural chlorophyll and anthocyanin dyes from cassava leaves and black sticky rice, respectively, to enhance the DSSC p

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Prakash, K. Vanitha, and Jangala Venkateswara Rao. "Spectrophometric Determination of Nelfinavir Mesylate." E-Journal of Chemistry 3, no. 2 (2006): 78–82. http://dx.doi.org/10.1155/2006/160909.

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Two new simple, sensitive, rapid and economical Spectrophotometric Methods (A and B) have been developed for the determination of Nelfinavir Mesylate in pharmaceutical bulk and tablet dosage form. The method A is based on the reaction of Nelfinavir with ferric chloride, potassium ferricyanide and hydrochloric acid to form a bluish green colored chromogen. The Method B is based on the formation of blood red colored chromogen with Ferric chloride and 1,10-phenanthroline. The absorbances of the chromogen were measured at their respective wavelength of maximum absorbance against the corresponding

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Reddy, J. Sudhakar, MD S. Maqsood Ahmed, I. E. Chakravarthy, and K. Prabhavathi. "Spectrophotometric Determination of Zidovudine in Pharmaceutical Dosage Forms." E-Journal of Chemistry 9, no. 1 (2012): 89–92. http://dx.doi.org/10.1155/2012/757916.

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A simple, sensitive and economical spectrophotometric method has been developed for the determination of zidovudine in commercial dosage forms. The method was based on the formation of chloroform extractable complex of zidovudine with wool fast blue. The absorbance of the extractable ion pair complex is measured at the wavelength of maximum absorbance 590 nm against the reagent blank treated similarly. Statistical analysis proves that the proposed methods are reproducible and selective for the estimation of zidovudine in bulk drug and in its tablet dosage form.

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Gaurav Manglaprasad Prajapati, Amol Shekhar Shinde, Kartikey Ashok Pawar, and Kiran Gotiram Chavan. "Method development and validation for the estimation of mirtazapine by using UV spectrophotometer with different order of derivatives." GSC Biological and Pharmaceutical Sciences 19, no. 2 (2022): 196–204. http://dx.doi.org/10.30574/gscbps.2022.19.2.0191.

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A precise, accurate, effortless, and inexpensive UV spectrophotometric was developed and authenticated for the appropriate estimation of Mirtazapine in bulk and marketed formulation. The solution consisting of Mirtazapine was being scanned over by UV- visible rays, ranging from its maximum wavelength absorbance. The numerous calibrations of standard Mirtazapine were formulated, and the absorbance for each was documented in response to the maximum wavelength. A graph was then plotted with the documented values of Concentration with that of the absorbance. Owing to this graph, the range and line

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Gaurav, Manglaprasad Prajapati, Shekhar Shinde Amol, Ashok Pawar Kartikey, and Gotiram Chavan Kiran. "Method development and validation for the estimation of mirtazapine by using UV spectrophotometer with different order of derivatives." GSC Biological and Pharmaceutical Sciences 19, no. 2 (2022): 196–204. https://doi.org/10.5281/zenodo.6627735.

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A precise, accurate, effortless, and inexpensive UV spectrophotometric was developed and authenticated for the appropriate estimation of Mirtazapine in bulk and marketed formulation. The solution consisting of Mirtazapine was being scanned over by UV- visible rays, ranging from its maximum wavelength absorbance. The numerous calibrations of standard Mirtazapine were formulated, and the absorbance for each was documented in response to the maximum wavelength. A graph was then plotted with the documented values of Concentration with that of the absorbance. Owing to this graph, the range and line

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Sachin, Bhusari *. Tejal Chaudhari Gaurav Shrangare Pravin Wakte. "DEVELOPMENT AND VALIDATION OF UV-VISIBLE SPECTROPHOTOMETRIC METHOD FOR ESTIMATION OF BUDESONIDE IN BULK AND FORMULATION." Journal of Pharma Research 7, no. 12 (2018): 300–304. https://doi.org/10.5281/zenodo.2529189.

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<strong><em>ABSTRACT</em></strong> <strong><em>Aim: </em></strong><em>To develop and validate a simple, precise and cost-effective UV- visible spectrophotometric method for the estimation of Budesonide according to the ICH Q2 (R1) guideline.</em> <strong><em>Methods: </em></strong><em>Spiked Budesonide solution was scanned over UV-visible range for its wavelength of maximum absorbance. Various calibration standards of Budesonide were prepared and absorbance was recorded at wavelength of maximum absorbance. Calibration curve of concentration vs. absorbance was plotted and linearity and range wa

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Kalidoss, P., S. Venkatachalapathy, and S. Suresh. "Optical and Thermal Properties of Therminol 55-TiO2 Nanofluids for Solar Energy Storage." International Journal of Photoenergy 2020 (January 22, 2020): 1–9. http://dx.doi.org/10.1155/2020/7085497.

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The present experimental study focuses on the energy storage performance of Therminol 55-TiO2 nanofluids for the absorption of solar energy. Photothermal conversion efficiency is enhanced using Fresnel lens and secondary reflectors with a glass-type evacuated absorber tube. The focal length of the Fresnel lens is 150 mm, and that of the secondary reflector is 70 mm. The optical absorbance, extinction coefficient, and thermal conductivity of nanofluids at 100, 250, 350, and 500 ppm are reported. The optical path length of the energy storage medium is 1 cm. The optical performance of the nanoflu

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Michinomae, M., H. Masuda, M. Seidou, and Y. Kito. "STRUCTURAL BASIS FOR WAVELENGTH DISCRIMINATION IN THE BANKED RETINA OF THE FIREFLY SQUID WATASENIA SCINTILLANS." Journal of Experimental Biology 193, no. 1 (1994): 1–12. http://dx.doi.org/10.1242/jeb.193.1.1.

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There is a greatly thickened region of retina in the ventral part of the eye of the firefly squid Watasenia scintillans, with an outer segment (OS) layer around 600 &micro;m thick. The distal two-thirds of this OS layer is yellow and contains a visual pigment, based on 4-hydroxyretinal (A4), with an absorbance maximum at 470 nm. The proximal third is pink and contains a visual pigment, based on dehydroretinal (A2), with an absorbance maximum at 500 nm. Light and electron microscopic investigations demonstrate the presence of four types of photoreceptor cell. In the pink layer, three of the

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Shah, Paresh B., and Kilambi Pundarikakshudu. "Spectrophotometric, Difference Spectroscopic, and High-Performance Liquid Chromatographic Methods for the Determination of Cefixime in Pharmaceutical Formulations." Journal of AOAC INTERNATIONAL 89, no. 4 (2006): 987–94. http://dx.doi.org/10.1093/jaoac/89.4.987.

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Abstract Three simple and sensitive spectrophotometric, difference spectroscopic, and liquid chromatographic (LC) methods are described for the determination of cefixime. The first method is based on the oxidative coupling reaction of cefixime with 3-methyl-2-benzothiazolinon hydrazone HCl in presence of ferric chloride. The absorbance of reaction product was measured at the maximum absorbance wavelength (max), 630 nm. The difference spectroscopic method is based on the measurement of absorbance of cefixime at the absorbance maximum, 268 nm, and minimum, 237 nm. The measured value was the ampl

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Amorim Filho, Volnei Resta, Vanessa Pezza Franzini, and José Anchieta Gomes Neto. "Exploring potentialities of the HR-CS FAAS technique in the determination of Ni and Pb in mineral waters." Eclética Química Journal 33, no. 1 (2018): 49. http://dx.doi.org/10.26850/1678-4618eqj.v33.1.2008.p49-56.

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National Health Surveillance Agency (ANVISA) established in the decree number 54 maximum allowed levels for Ni and Pb in mineral and natural waters at 20 μg L-1 and 10 μg L-1, respectively. For screening analysis purposes, the high-resolution continuum source flame atomic absorption spectrometry technique (HR-CS FAAS) was evaluated for the fast-sequential determination of nickel and lead in mineral waters.Two atomic lines for Ni (232.003 nm – main and 341.477 nm – secondary) and Pb (217.0005 nm – main and 283.306 nm - secondary) at different wavelength integrated absorbance (number of pixels)

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Amorim Filho, V. R., V. P. Franzini, and J. A. Gomes Neto. "Exploring potentialities of the HR-CS FAAS technique in the determination of Ni and Pb in mineral waters." Eclética Química 33, no. 1 (2008): 49–56. http://dx.doi.org/10.1590/s0100-46702008000100007.

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National Health Surveillance Agency (ANVISA) established in the decree number 54 maximum allowed levels for Ni and Pb in mineral and natural waters at 20 µg L-1 and 10 µg L-1, respectively. For screening analysis purposes, the high-resolution continuum source flame atomic absorption spectrometry technique (HR-CS FAAS) was evaluated for the fast-sequential determination of nickel and lead in mineral waters.Two atomic lines for Ni (232.003 nm - main and 341.477 nm - secondary) and Pb (217.0005 nm - main and 283.306 nm - secondary) at different wavelength integrated absorbance (number of pixels)

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Yudistira, Hadi Teguh, and Kiki Kananda. "The Preliminary Microwave Metamaterial Absorber Based on Ring-Shaped for Stealth Technology." IOP Conference Series: Earth and Environmental Science 1209, no. 1 (2023): 012028. http://dx.doi.org/10.1088/1755-1315/1209/1/012028.

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Abstract Controlling electromagnetic waves on the material is needed by several applications such as sensors, stealth technology, and energy harvesting. An artificial material that could control electromagnetic waves is called metamaterial. Meanwhile, a metamaterial absorber can absorb the electromagnetic wave. Two concepts can be used to explain the absorbing phenomena on metamaterial absorber: the matching impedance of the air and the part of the imaginary that is high of the index of refractive collectively or the theory of interference that is destructive. The correlation of matching air i

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Pieters, Marlien, Martin Guthold, Claudia M. Nunes, and Zelda de Lange. "Interpretation and Validation of Maximum Absorbance Data Obtained from Turbidimetry Analysis of Plasma Clots." Thrombosis and Haemostasis 120, no. 01 (2019): 044–54. http://dx.doi.org/10.1055/s-0039-1698460.

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AbstractTurbidimetry is used to characterize fibrin clot properties. In purified systems, maximum absorbance (MA) directly relates to fibrin fiber cross-sectional area. However, in plasma samples there are discrepancies in the relationships between MA and fibrinogen concentration, fiber diameter, other clot properties, and cardiovascular disease outcomes, which complicate data interpretation. This study aims to advance understanding of MA of plasma clots through testing how well it relates to fundamental dependence on fibrinogen concentration and fiber diameter as predicted by light scattering

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