Background: Stimulation of inflammatory cells such as polymorphonuclear cells (PMN) will initiate to release free radicals in destroying bacteria. Excessive free radicals can damage cells in the body. Antioxidants as one of the body's defense systems will neutralize existing free radicals. Chitosan from Haruan scales in addition to being antimicrobial turned out to also be antioxidants. Objective: To know the antioxidant potential of chitosan from haruan (Channa striata) scales. Methods: This study is a pure experimental (true experimental design) with a post-test only with control group design using two treatment groups, with quantitative tests to calculate the amount of antioxidant activity of chitosan from fish scales using DPPH radical reduction method. The first treatment is 4, 6, 8 and 10 ppm standard ascorbic acid concentration with DPPH solution as positive control, and the second treatment is 200, 250, 300 and 350 ppm chitosan from Haruan scales concentration with DPPH solution. Results: The results showed that chitosan from Haruan fish scales have antioxidant activity with 50.513% percentage of inhibition at a maximum concentration of 350 ppm with an IC50 value of 356.98 ppm. The results of the independent T-test showed that there was a significant difference between the inhibition percentage of chitosan from haruan fish scales and the inhibition percentage of ascorbic acid (p = 0,000) (p <0.05). Conclusion: Chitosan from Haruan fish scales proved to have antioxidant activity.Keywords: Antioxidants, Chitosan, Haruan fish scalesABSTRACTBackground: Stimulation of inflammatory cells such as polymorphonuclear cells (PMN) will initiate to release free radicals in destroying bacteria. Excessive free radicals can damage cells in the body. Antioxidants as one of the body's defense systems will neutralize existing free radicals. Chitosan from Haruan scales in addition to being antimicrobial turned out to also be antioxidants. Objective: To know the antioxidant potential of chitosan from haruan (Channa striata) scales. Methods: This study is a pure experimental (true experimental design) with a post-test only with control group design using two treatment groups, with quantitative tests to calculate the amount of antioxidant activity of chitosan from fish scales using DPPH radical reduction method. The first treatment is 4, 6, 8 and 10 ppm standard ascorbic acid concentration with DPPH solution as positive control, and the second treatment is 200, 250, 300 and 350 ppm chitosan from Haruan scales concentration with DPPH solution. Results: The results showed that chitosan from Haruan fish scales have antioxidant activity with 50.513% percentage of inhibition at a maximum concentration of 350 ppm with an IC50 value of 356.98 ppm. The results of the independent T-test showed that there was a significant difference between the inhibition percentage of chitosan from haruan fish scales and the inhibition percentage of ascorbic acid (p = 0,000) (p <0.05). Conclusion: Chitosan from Haruan fish scales proved to have antioxidant activity.    Keywords: Antioxidants, Chitosan, Haruan fish scales.

ABSTRAKHerba pecut kuda (Stachytarpheta jamaicensis (L.) Vahl) secara tradisional dapat digunakan untuk mengobati berbagai penyakit, seperti infeksi dan batu saluran kencing, diuretik, rheumatik, sakit tenggorokan (faringitis), pembersih darah, datang haid tidak teratur, keputihan, hepatitis A. Penelitian ini bertujuan untuk mengetahui keamanan penggunaan herba pecut kuda pada hewan uji. Ekstrak air herba pecut kuda dibuat dengan metode perebusan dalam air suling selama 30 menit. Pengujian toksisitas akut dilakukan mengacu pada pedoman BPOM. Pengujian toksisitas akut dilakukan pada mencit Swiss Webster jantan dan betina dengan pemberian tunggal ekstrak air herba pecut kuda pada dosis 100, 500, 2.000, 5.000 dan 10.000 mg/kg bb. Pengamatan dilakukan selama 14 hari. Hasil menunjukkan bahwa selama 14 hari setelah pemberian tunggal ekstrak air herba pecut kuda, tidak ada kematian pada seluruh hewan uji. Dapat disimpulkan bahwa LD50 ekstrak air herba pecut kuda lebih besar dari 5.000 mg/kg bb. Kata kunci: pecut kuda, Stachytarpheta jamaicensis, toksisitas akut, ekstrak air, LD50 ABSTRACT Traditionally, Pecut kuda (Stachytarpheta jamaicensis (L.)Vahl) is used to treat various