cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
jkk.hydrogen@gmail.com
Phone
-
Journal Mail Official
jkk.hydrogen@gmail.com
Editorial Address
Jln. Pemuda No. 59A Mataram
Location
Kota mataram,
Nusa tenggara barat
INDONESIA
Hydrogen: Jurnal Kependidikan Kimia
Published by Universitas Pendidikan Mandalika
ISSN : 23386487     EISSN : 26563061     DOI : Prefix 10.33394
Core Subject : Science, Education,
Chemistry Education
Hydrogen: The Chemistry Education Journal published by the Chemistry Education Study Program which contains articles raised from the results of conceptual research and studies in chemistry and chemistry education including education and learning, device development, media and learning models.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 742 Documents
 71   72   73   74   75 
Influence of Solvent Polarity on Extract Yield and Phytochemical Profile of Kratom Leaves (Mitragyna speciosa) Anggi Nabila; Masriani; Lukman Hadi; Aldi Tobing; Firman Shantya Budi
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 4 (2026): August 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i4.22148

Abstract

Solvent polarity plays an important role in determining the amount and profile of secondary metabolites recovered from plant materials. However, comparative information on the effects of different solvent polarities on the extract yield and phytochemical profile of kratom leaves (Mitragyna speciosa) remains limited. This study aimed to compare the extract yield and qualitative phytochemical profile of kratom leaves extracted using ethanol, distilled water, and ethyl acetate. Ethanol and ethyl acetate extractions were performed using maceration for 3 × 24 h, whereas distilled water extraction was conducted using an infusion method at 90 °C for 15 min. The concentrated extracts were evaluated based on their yield, followed by qualitative phytochemical screening for alkaloids, flavonoids, phenolics, tannins, triterpenoids, steroids, and saponins. Ethanol produced the highest extract yield (12.00%), followed by distilled water (6.54%) and ethyl acetate (2.07%). The phytochemical screening revealed different profiles among the extracts. The ethanol extract showed alkaloids, flavonoids, phenolics, tannins, triterpenoids, and saponins; the distilled water extract showed alkaloids, flavonoids, phenolics, tannins, and saponins; while the ethyl acetate extract showed alkaloids, phenolics, tannins, and steroids. These findings demonstrate that solvent polarity influences both the extract yield and the range of phytochemical groups detected in kratom leaf extracts. The comparative findings provide a basis for selecting an appropriate solvent according to the desired phytochemical profile and support further investigation of kratom leaves as a source of bioactive compounds.
Guided-Inquiry E-Module for Critical Thinking in Reaction-Rate Learning Rini Rianti; Muntari; Sunniarti Ariani
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 4 (2026): August 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i4.22218

Abstract

This study aimed to develop a guided-inquiry e-module for reaction-rate learning and determine its validity, practicality, and initial effectiveness in fostering critical-thinking skills. The 4D research-and-development model was employed, followed by a limited one-group pretest–posttest trial involving 19 eleventh-grade science students at SMAN 1 Labuapi. The product, response questionnaires, and four-item essay test were reviewed by two chemistry-education lecturers and one chemistry teacher. The novelty of the product lies in the explicit alignment of each guided-inquiry stage with the critical-thinking indicators of interpretation, analysis, evaluation, and inference. Validity was analyzed using Aiken’s V, inter-rater reliability using Percentage of Agreement, practicality using response percentages, and learning improvement using normalized gain. The e-module achieved a mean Aiken’s V of 0.89 and 89% reliability. The teacher and student questionnaires achieved Aiken’s V values of 0.93 and 0.89 and reliability values of 94% and 89%, respectively; the critical-thinking test achieved an Aiken’s V of 0.93 and 92% reliability. Practicality was rated at 91% by the teacher and 85% by students. The mean N-Gain of 0.59 indicated a moderate improvement. Therefore, the e-module was highly valid, highly practical, and demonstrated initial effectiveness in the limited trial.

Page 75 of 75 | Total Record : 742

 71   72   73   74   75 

Filter by Year

2013 2026


Reset
Filter By Issues
All Issue Vol. 14 No. 4 (2026): August 2026 Vol. 14 No. 3 (2026): June 2026 Vol. 14 No. 2 (2026): April 2026 Vol. 14 No. 1 (2026): February 2026 Vol. 13 No. 6 (2025): December 2025 Vol. 13 No. 5 (2025): October 2025 Vol. 13 No. 4 (2025): August 2025 Vol. 13 No. 3 (2025): June 2025 Vol. 13 No. 2 (2025): April 2025 Vol 13, No 1 (2025): February 2025 Vol. 13 No. 1 (2025): February 2025 Vol. 12 No. 6 (2024): December 2024 Vol 12, No 6 (2024): December 2024 Vol 12, No 5 (2024): October 2024 Vol. 12 No. 5 (2024): October 2024 Vol 12, No 4 (2024): August 2024 Vol. 12 No. 4 (2024): August 2024 Vol 12, No 3 (2024): June-July 2024 Vol. 12 No. 3 (2024): June-July 2024 Vol 12, No 2 (2024): April-May 2024 Vol. 12 No. 2 (2024): April-May 2024 Vol. 12 No. 1 (2024): February 2024 Vol 12, No 1 (2024): February 2024 Vol. 11 No. 6 (2023): December 2023 Vol 11, No 6 (2023): December 2023 Vol 11, No 5 (2023): October 2023 Vol 11, No 4 (2023): August 2023 Vol 11, No 3 (2023): June 2023 Vol 11, No 2 (2023): April 2023 Vol 11, No 1 (2023): February 2023 Vol 10, No 2 (2022): Hydrogen: Jurnal Kependidikan Kimia Vol 10, No 1 (2022): Hydrogen: Jurnal Kependidikan Kimia Vol 9, No 2 (2021): Hydrogen: Jurnal Kependidikan Kimia Vol 9, No 1 (2021): Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 2 (2020): Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 2 (2019): Hydrogen: Jurnal Kependidikan Kimia Vol 7, No 1 (2019): Hydrogen: Jurnal Kependidikan Kimia Vol 6, No 2 (2018): Hydrogen: Jurnal Kependidikan Kimia Vol 6, No 1 (2018): Hydrogen: Jurnal Kependidikan Kimia Vol 5, No 2 (2017): Hydrogen: Jurnal Kependidikan Kimia Vol 5, No 1 (2017): Hydrogen: Jurnal Kependidikan Kimia Vol 4, No 2 (2016): Hydrogen: Jurnal Kependidikan Kimia Vol 4, No 1 (2016): Hydrogen: Jurnal Kependidikan Kimia Vol 3, No 2 (2015): Hydrogen: Jurnal Kependidikan Kimia Vol 3, No 1 (2015): Hydrogen: Jurnal Kependidikan Kimia Vol 2, No 2 (2014): Hydrogen: Jurnal Kependidikan Kimia Vol 2, No 1 (2014): Hydrogen: Jurnal Kependidikan Kimia Vol 1, No 2 (2013): Hydrogen: Jurnal Kependidikan Kimia Vol 1, No 1 (2013): Hydrogen: Jurnal Kependidikan Kimia More Issue