This study employed a selective and high adsorption performance for meropenem. Molecularly imprinted polymer for meropenem (MeIP) as the selective sorbent was prepared through a bulk polymerization reaction. Methacrylic acid, ethylene glycol dimethacrylate, benzoyl peroxide, and dimethyl sulfoxide were applied as functional monomer, crosslinker agent, initiator, and solvent, respectively. Scanning electron microscopy, thermogravimetric analysis, Brunauer-Emmett-Teller analysis, and Fourier transform infrared spectroscopy were used to characterize the morphology, pore size, and structure of imprinted polymers. The maximum adsorption capacity was achieved at pH = 3, after 4 h contacted, under 150 rpm, and 25 mg of polymer applied. The maximum adsorption capacity of MeIP for meropenem was 51.963 mg/L; the synthesized polymer had superior selectivity to meropenem compared to that of the other antibiotics (imprinting factor, IF = 2.58). Furthermore, the thermodynamic and kinetic analyses indicated that the results were in accord with the Freundlich model and the pseudo-second-order kinetic model, respectively. MeIP was selective in batch adsorption, and molecularly imprinted solid-phase extraction protocols were selective to meropenem. It was then applied to analyze meropenem in human blood plasma and resulted in 78.52 ± 2.71 of recovery.

Reaksi antara amina primer dengan karbonil menghasilkan basa Schiff (Schiff base) yang secara teori memiliki sifat antibakteri. Sifat antibakteri ini dapat ditingkatkan dengan pembentukan kompleks Schiff base dengan logam tertentu. Telah dilakukan sintesis senyawa Schiff base dan kompleksnya dari 4,4-diamino difenil eter, ortohidroksi benzaldehid dan ion logam Fe (III). Senyawa Schiff base dan kompleks yang terbentuk dikarakterisasi gugus fungsinya dengan spektrometer FT-IR. Senyawa yang terbentuk kemudian diuji aktivitas antibakterinya terhadap bakteri Staphylococcus aureus menggunakan metode difusi agar. Spektra senyawa Schiff base mempunyai puncak pada bilangan gelombang 1620,21 cm-1 dan spektra senyawa kompleks mempunyai puncak pada bilangan gelombang 1612,49 cm-1. Puncak pada senyawa Schiff base mengindikasikan adanya ikatan CH=N, pergeseran puncak pada kompleks Schiff base menunjukkan adanya ikatan antara nitrogen dengan ion logam. Hasil pengujian senyawa Schiff base dan kompleks terhadap bakteri S. aureus menunjukkan positif sebagai antibakteri S. aureus.

AbstrakSenyawa Schiff base adalah senyawa dengan gugus fungsional azometin (-CH=N-), yang terbentuk dari kondensasi amin primer dengan senyawa karbonil. Beberapa senyawa Schiff base yang berhasil disintesis terbukti bersifat sebagai antimikroba. Telah disintesis senyawa Schiff base dari 4,4 diamino difenil eter, ortohidroksi benzaldehid serta kompleksnya dengan ion logam Cu (II). Senyawa Schiff base yang terbentuk dan kompleks dikarakterisasi gugus fungsinya dengan spektrometer FT-IR. Senyawa yang terbentuk kemudian diuji aktivitas antibakterinya terhadap bakteri Escherichia coli menggunakan metode difusi agar. Spektrum senyawa Schiff base mempunyai puncak pada bilangan gelombang 1620,21 cm -1 dan spektrum senyawa kompleks mempunyai puncak pada bilangan gelombang 1612,49 cm -1 . Puncak pada senyawa Schiff base mengindikasikan adanya ikatan CH=N, pergeseran puncak pada kompleks Schiff base menunjukkan adanya ikatan antara nitrogen dengan ion logam. Hasil pengujian senyawa Schiff base dan kompleks terhadap bakteri Escherichia coli menunjukkan snyawa ini positif sebagai antibakteri Escherichia coli. Aktivitas sebagai antibakteri, baik Schiff base maupun kompleksnya lebih kecil dibandingkan aktivitas yang diberikan oleh kontrol, yaitu kloramfenikol. Kata kunci: Antibakteri, ortohidroksi benzaldehid, Schiff-base, 4,4 diaminodifenil eter Synthesis and Characterization of Antibacteria Schiff Base with Copper (Cu) ComplexAbstract A Schiff base is a compound that has azomethine group (-CH=N-). It is can be formed by reacting primary amines and carbonyl group. The Schiff base and its complex that has been synthesized before, showed that it has antibacteria effect. The synthesis of Schiff base and its complex from 4.4 diamino diphenyl ether (primary amine), orthohidroxy benzaldehyde (aldehyde, a carbonyl group) and metal ions Cu(II) has been done. The functional group of Schiff base and the complex are then characterized using the IR-spectrometer. The IR spectrum of Schiff base compounds have a sharp peak at wave number of 1620.21 cm -1 that indicates the azomethine group. The IR spectrum of complex compounds have a peak of 1612.49 cm -1 due to the nitrogen-Cu bond. Schiff base and the complex are also tested on antibacteria effect, through diffusion method. The result showed that Schiff base and complex has antibacteria effect. The antibacterial effect given both Schiff base and its complex are lower than the antibacterial effect given by the control, chloramphenicol.

The synthesis of film chitosan- ZnO nanoparticles-CTAB were studied. The aims of this research were synthesis of the film chitosan-ZnO nanoparticles-CTAB, its characterization and, application of the film chitosan-ZnO nanoparticles-CTAB as an antibacterial of Staphylococcus aureus. The film of chitosan-ZnO nanoparticles-CTAB was synthesized by the casting method and characterized by FTIR spectroscopy and X-ray diffraction, respectively. The film of chitosan-ZnO nanoparticles-CTAB was used as an antibacterial agent with the agar disk diffusion method. The result showed that the Zn-O group at the film of chitosan-ZnO nanoparticles-CTAB was detected at a wavenumber between 578-619 cm-1. The band at 2852.72-2854.65 cm-1 is the band of C-H groups in the film of chitosan-ZnO nanoparticles-CTAB. The effect of ZnO nanoparticles-CTAB changed of the physical structure of chitosan. The average of the inhibition zone in the film of chitosan-ZnO nanoparticles-CTAB I, II and III was 10.37 ± 0.55, 11.31± 1.27 and 10.38 ± 0.24 mm respectively.

Antibiotics have recently gained in popularity due to their usage in medical treatment and the process of removing them from the environment. Amoxicillin is one of the antibiotics that constitutes the study's subject. On a Pt disc electrode and a cobalt hydroxide modified-Pt electrode, the scan rate and pH in the electrochemical oxidation of amoxicillin were investigated. The voltammetry measurement's current peak revealed that changing the electrode surface could increase the electrochemical response and sensitivity of the working electrodes. The Pt/Co(OH)2 modification working electrode had a high sensitivity in the electro-oxidation determination of amoxicillin, with a linear range of the sensor of 20 to 80 M and a limit of detection of 7.15 M for the Pt disc electrode and 3.64 M for the cobalt hydroxide modified Pt electrode. The findings of determination in real samples with electro-oxidation using a modified electrode were in good agreement with a confidence level of 95 percent, according to the comparing method with HPLC.