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All Journal Logistik Hydrogen: Jurnal Kependidikan Kimia
Asfirah, Lia Retian
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Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Industrial & Manufacturing Engineering Transportation

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OPTIMIZING PLANNING AND INVENTORY CONTROL TO SUPPORT TRAINING PROGRAMS IN GOODS AND SERVICES Asfirah, Lia Retian; Khoirotun Nafillah; Widanto Mukti Adi; Novita Widyaningrum; Niken Devi Rosita
LOGISTIK Vol. 18 No. 01 (2025): Logistik
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/logistik.v18i02.55270

Abstract

Perencanaan dan pengendalian persediaan barang dan jasa merupakan aspek krusial dalam mendukung keberhasilan penyelenggaraan pendidikan dan pelatihan (diklat), khususnya dalam institusi pemerintahan atau pendidikan vokasi. Penelitian ini bertujuan untuk menganalisis secara mendalam proses perencanaan dan pengendalian persediaan barang dan jasa dalam penyelenggaraan diklat, dengan fokus pada ketersediaan perlengkapan peserta seperti seragam, alat tulis kantor (ATK), dan modul pembelajaran. Metode yang digunakan adalah pendekatan kualitatif deskriptif melalui wawancara, observasi, dan studi dokumentasi terhadap tujuh informan kunci yang terlibat langsung dalam proses perencanaan dan pengadaan. Hasil penelitian menunjukkan bahwa sering terjadi ketidaksesuaian antara jumlah peserta dengan perlengkapan yang tersedia, yang disebabkan oleh tidak adanya sistem prediksi kebutuhan yang memadai, keterlambatan dalam pengadaan, serta rotasi penyedia barang/jasa yang tidak konsisten. Selain itu, keterbatasan sumber daya manusia (SDM) yang memiliki sertifikasi dan kemampuan teknis dalam bidang pengadaan juga menjadi kendala utama. Penelitian ini merekomendasikan penerapan sistem perencanaan yang terintegrasi, pemilihan rekanan tetap, serta peningkatan kompetensi SDM melalui pelatihan dan sertifikasi. Dengan sistem perencanaan dan pengendalian yang optimal, diharapkan kebutuhan peserta diklat dapat terpenuhi secara tepat waktu dan efisien, sekaligus meningkatkan kepuasan dan kualitas penyelenggaraan diklat secara keseluruhan.
Alpha Amylase Inhibitory Activity of Curcumin Analogs and Its Synergy with Ferulic Acid in Vitro Nafillah, Khoirotun; Ariyani, Helena Devi; Asfirah, Lia Retian
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 3 (2025): June 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i3.15683

Abstract

Curcumin analog compounds are α,β unsaturated compounds through simplifying the beta diketo group to monoketo, which has better bioavailability and a more stable structure than curcumin compounds. This study aims to determine the α-amylase inhibitory activity on symmetric curcumin analog compounds, namely the compounds 2,6-bis(3,4-dimethoxybenzylidine)cyclohexanone (A) and 2,6-bis(3,4-dimethoxybenzylidine)cyclopentanone (B). as well as testing its synergistic interaction with ferulic acid in vitro. The α-amylase inhibition test was carried out using an iodine reagent and a starch solution as a substrate. The absorbance value was measured using a UV-vis spectrophotometer (λ 568 nm), and the % inhibition was calculated. The average value of the optimum α-amylase inhibition percentage for compounds A, B, and ferulic acid, respectively is 58.17%; 22.95%, and 93.52%. Based on the synergistic interaction, it was concluded that compounds A and B showed synergistic activity with ferulic acid. The percentage of α-amylase inhibition in the concentration ratio of curcumin analog A: ferulic acid (1:8) was 98.65%, and curcumin analog B: ferulic acid (1:4) was 98.37%. This shows that combining compounds between symmetrical curcumin analogs and ferulic acid can increase the activity of antidiabetic drug candidate compounds compared to single compounds. This study offers a new approach by testing the potential combination of curcumin and ferulic acid analogues as α-amylase inhibitors in vitro, demonstrating a synergy that has not been widely explored and opening up opportunities for developing more effective natural antidiabetic therapies.
Co-Authors Ariyani, Helena Devi Khoirotun Nafillah Niken Devi Rosita Novita Widyaningrum Widanto Mukti Adi