?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Potensi+Antibakteri+Ekstrak+Metanol+Gracilaria+sp.+terhadap+Escherichia+coli+dengan+Metode+Difusi+Cakram+&rft.creator=Ammanda+Sadiva%2C+++Ajeng++Pawesti&rft.subject=500+ilmu+pengetahuan+alam+dan+matematika&rft.subject=570+Biologi&rft.description=Penggunaan+sumber+daya+laut+sebagai+alternatif+bahan++antibakteri+alami+semakin+berkembang++dalam++beberapa++tahun++terakhir.++Gracilaria++sp.%2C++sejenis++alga++merah%2C+diketahui++memiliki++kandungan++metabolit++sekunder++yang++berpotensi++sebagai++agen+antibakteri%2C++khususnya++terhadap++Escherichia++coli.++Penelitian++ini++bertujuan++untuk+menentukan+potensi+antibakteri+ekstrak+metanol+Gracilaria+sp.+terhadap++++E.+coli+menggunakan++metode++jenis++eksperimental++dengan++Rancangan++Acak++Lengkap+(RAL)+dengan+analisis+data+One-Way+ANOVA+dan+dilanjutkan+dengan+Uji+Tukey.+Larutan++stok++ekstrak++dibuat++dengan++konsentrasi++100++mg%2FmL++dan++diuji++pada+konsentrasi++0%2C05%25%2C++1%25%2C++5%25%2C++dan++10%25++dengan++kontrol++positif++ciprofloxacin++dan+kontrol++negatif++akuades++steril.++Pengujian+dilakukan++dalam++tiga++kali++pengulangan.+Hasil+penelitian+menunjukkan+bahwa+ekstrak+metanol+Gracilaria+sp.+menghasilkan+zona+hambat+yang+terbentuk+pada+konsentrasi+tertinggi+10%25+dan+5%25+dengan+rata-+rata+hanya+mencapai+(0%2C075+mm).+Dengan+demikian%2C+ekstrak+metanol+Gracilaria+sp.+memiliki++potensi++antibakteri++yang++lemah++terhadap++Escherichia++coli%2C++karena++zona+hambat+yang+terbentuk+jauh+lebih+kecil+dibandingkan+kontrol+positif+yang+mencapai+1%2C7+mm.+%0D%0AKata+kunci%3A+Gracilaria+sp.%2C+antibakteri%2C+Escherichia+coli%2C+difusi+cakram%2C+ekstrak+metanol.+%0D%0A%0D%0AThe+use+of+marine+resources+as+an+alternative+source+of+natural+antibacterial+agents+has+been+increasingly+developed+in+recent+years.+Gracilaria+sp.%2C+a+type+of+red+algae%2C+is++known++to++contain++biologically++active++compounds++that++have++potential++as+antibacterial++agents%2C++particularly++against++Escherichia++coli.++This++study++aimed++to+determine++the++antibacterial++potential++of++the++methanolic++extract++of++Gracilaria++sp.+against+E.+coli+using+an+experimental+method+based+on+a+Completely+Randomized+Design+(CRD).+Data+were+analyzed+using+One-Way+ANOVA+followed+by+Tukey%E2%80%99s+test.+A+stock+solution+of+the+extract+was+prepared+at+a+concentration+of+100+mg%2FmL+and+tested+at+concentrations+of+0.05%25%2C+1%25%2C+5%25%2C+and+10%25%2C+with+ciprofloxacin+as+the+positive++control++and++sterile++distilled++water++as++the++negative++control.++The++test++was+conducted++in++three++replicates.++The++results++showed++that++the++methanolic++extract++of+Gracilaria+sp.+produced+an+inhibition+zone+at+the+highest+concentrations+(10%25+and+5%25)+with+an+average+diameter+of+only+0.075+mm.+Therefore%2C+the+methanolic+extract+of+Gracilaria+sp.+has+weak+antibacterial+potential+against++Escherichia+coli%2C+as+the+inhibition++zone++formed++is++significantly++smaller++than++that++of++the++positive++control%2C+which+reached+1.7+mm.+%0D%0AKeywords%3A++Gracilaria++sp.%2C++antibacterial%2C++Escherichia++coli%2C++disk++diffusion%2C+methanolic+extract.+&rft.publisher=FAKULTAS+MATEMATIKA+DAN+ILMU+PENGETAHUAN+ALAM&rft.date=2025-05-21&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F88304%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F88304%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F88304%2F3%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++Ammanda+Sadiva%2C+Ajeng+Pawesti++(2025)+Potensi+Antibakteri+Ekstrak+Metanol+Gracilaria+sp.+terhadap+Escherichia+coli+dengan+Metode+Difusi+Cakram.++FAKULTAS+MATEMATIKA+DAN+ILMU+PENGETAHUAN+ALAM%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F88304%2F