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Dr.

Helmina Br. Sembiring

M.Si.
Helmina Br. Sembiring

Dr. Helmina Br. Sembiring, M.Si.

NIP

197602022000122002

NIDN

0002027601

Program Studi
Program Studi S1 Kimia
Program Studi S2 Kimia
Program Studi S3 Ilmu Kimia
Bidang Keilmuan
Jabatan
Lektor Kepala
Media Penelitian
Google Scholar Sinta Scopus
Kontak:
E-mail

helmina.sembiring@usu.ac.id, helmina02@yahoo.com

Alamat Kantor

Fakultas Matematika dan Ilmu Pengetahuan Alam

Curriculum Vitae file_download
Publikasi
Publikasi Lainnya

Publikasi Nasional

Antioxidants Activity of Face Toner from Ethyl Acetate Fraction of Okra Seeds

SOVIA LENNY , HELMINA BR SEMBIRING , FATMAWATI LUBIS

Isolation and Identification of Flavonoid Compound from the Rambutan Stem Bark (Nephelium lappaceum L.)

HELMINA BR SEMBIRING

Antioxidant Activity Assay of Eucalyptus pellita Leaf Extract

SOVIA LENNY , HELMINA BR SEMBIRING

Training in the Manufacture of Softener Fragrance Aroma Therapy in Tembung Village, District Percut Sei Tuan

AMRU DAULAY , MARPONGAHTUN , AGUNG PRATAMA , ANDRIAYANI , HELMINA BR SEMBIRING , ANIZA SALVIANA PRAYUGO

AKTIVITAS ANTIOKSIDAN SENYAWA FLAVONOIDA DARI DAUN BENALU KAKAO (Dendrophthoe pentandra (L.) Miq.)

HELMINA BR SEMBIRING , SOVIA LENNY

Publikasi Internasional

Phytochemical Insights into Plantation Timber: Cudracusisoflavone and Bioactivities of Eucalyptus pellita Leaf Extracts from North Sumatran Clones

SOVIA LENNY , HELMINA BR SEMBIRING , MURNI SURYANI LUMBANTORUAN

Microwave-assisted enzymatic production of cosmetic ester 2-ethylhexyl oleate and myristate

EKO K SITEPU , HELMINA BR SEMBIRING , JULIATI BR TARIGAN , ELLA PARAWITA , DEA HAFIZAH , NOVIA RAMADHANI , MAYA RANI SHAHIRA SIREGAR , Emilia Abdulmalek , Rodiah N. Sari , Firman Sebayang

Fatty acid methyl ester (FAME) production from sludge solid waste as K2O/ SiO2 catalyst

HELMINA BR SEMBIRING , SABARMIN PERANGINANGIN

Qualitative Determination of Secondary Metabolites and Antioxidant Activity of Betel (Piper betle L.)

SOVIA LENNY , HELMINA BR SEMBIRING

GLYCOSYLATED FLAVONOID COMPOUND FROM COCOA PARASITE LEAVES (Dendrophthoe pentandra (L.) Mig.)

HELMINA BR SEMBIRING , LAMEK MARPAUNG , MOHAMMAD BASYUNI , Prof. Dr. Partomuan Simanjuntak, M.Sc.

Waste Passion Fruit Peel as a Heterogeneous Catalyst for Room-Temperature Biodiesel Production

Dr. KERISTA TARIGAN, M.Eng.Sc. , JULIATI BR TARIGAN , MINTO SUPENO , HELMINA BR SEMBIRING , EKO K SITEPU

Calcium carbonate from chicken eggshells as adsorbents

NURHAIDA PASARIBU , HELMINA BR SEMBIRING

Facile method to synthesize of n-graphene nano sheets

ANDRIAYANI , NURHAIDA PASARIBU , SAUR LUMBANRAJA , MINTO SUPENO , SABARMIN PERANGINANGIN , HELMINA BR SEMBIRING , HERLINCE SIHOTANG , RIKSON A F SIBURIAN

Isolation and Characterization of Flavonoids Isolated from Leaves of Benalu Jeruk (Scurrula fusca G. Don) as Antioxidant

HELMINA BR SEMBIRING

Antioxidant and antibacterial activity of some leaves extracts (Methanol, ethyl acetate and N-Hexane

HELMINA BR SEMBIRING