Dr. Helmina Br. Sembiring, M.si. | Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara

Dr. Helmina Br. Sembiring, M.Si.

Employee ID Number

197602022000122002

National Lecturer Registration Number

0002027601

Study Program

Program Studi S3 Ilmu Kimia

Program Studi S1 Kimia

Program Studi S2 Kimia

Field Of Knowledge

Positions

Associate Professor

Research Media

Contacts:

E-mail

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

Office Address

USU Faculty of Mathematics and Natural Sciences

Curriculum Vitae file_download

Profile

Helmina Br. Sembiring Dr. S.Si., M.Si., born in Sukaramai on February 02, 1976, is a Chemistry lecturer at the Universitas Sumatera Utara. She completed her doctoral degree in Chemistry at USU in 2016.

Publications

Other Publications

National Publications

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

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

HELMINA BR SEMBIRING , SOVIA LENNY

International Publications

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.

Researches

Other Researches

Pembuatan Bahan Kosmetik 2-Etilheksil Asam Lemak Melalui Reaksi Esterifikasi Enzimatis Menggunakan Radiasi Mikrowave

HELMINA BR SEMBIRING , EKO K SITEPU , Prof. Dr. Emilia Binti Abd. Malik

PENGARUH KOMPOSISI DARI POLIETILEN OKSIDA-POLIPIROL (PEO-PPy) NANOFIBER PADA UJI ANTIBAKTERI TERHADAP E.coli DAN BIOKOMPATIBILITAS SEL FIBROBLAS L929

HELMINA BR SEMBIRING , SABARMIN PERANGINANGIN

KARAKTERISASI SENYAWA AKTIF DARI DAUN SIRIH (Piper betle) SEBAGAI ANTIOKSIDAN DAN TOKSISITASNYA

HELMINA BR SEMBIRING , SOVIA LENNY

Isolasi dan Penentuan Struktur Senyawa Flavonoida Daun Benalu Kakao (Dendrophtoe petandra (L) Miq Serta Uji Aktivitas Antioksidan dan Sitotoksisitas

HELMINA BR SEMBIRING , SOVIA LENNY

Community Services

Pelatihan pembuatan sabun batangan dan lilin berbasis minyak jelantah bagi Moria GBKP Rayon Medan Sekitar di GBKP Sunggal Asam Kumbang Kecamatan Medan Selayang Kotamadya Medan

GBKP Sunggal Asam Kumbang, Medan. JULIATI BR TARIGAN , HELMINA BR SEMBIRING , LINA TARIGAN , SABARMIN PERANGINANGIN , EKO K SITEPU . 2023

Intellectual Property Rights

Other Intellectual Property Rights

Courses Taught

No data available