Nurhayati, Betty
Indonesian Association of Food Technologists

Published : 2 Documents

Found 2 Documents

Production and Application of Lactobacillus plantarum IBL-2 Bacteriocins as Meat Product Biopreservatives Wibowo, Marlia Singgih; Muzakiyah, Isra; Nurhayati, Betty; Padmasawitri, Tjokorde Armina; Widiastuti, Yantyati; Gusdinar, Tutus
Indonesian Food and Nutrition Progress Vol 14, No 1 (2017)
Publisher : Indonesian Association of Food Technologists

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ifnp.24278


Biopreservation is one of the alternatives to obtain safe food products. The produced bacteriocin by Lactic Acid Bacteria (LAB) is potential as biopreservatives, which is safe for consumption, since it was a protein degradable by proteolytic enzymes. This study aimed to optimize bacteriocin production from L. plantarum IBL-2 and to evaluate the effectiveness of bacteriocins in reducing the number of total plate count and Salmonella typhimurium in ground beef. Bacteriocin was produced through fermentation of L. plantarum IBL-2, under various conditions to yield the compound with the best antimicrobial activity. The total number of bacteria in ground beef after the addition of L. plantarum IBL-2 fermentation supernatant was determined. The result was compared with the sample without preservatives (control), and sample added with commercial Nissin. All three samples of ground beef were spiked with S. typhimurium and incubated for 0, 2, 6, 8, 12, 14 days at a temperature of 4-10 ° C. Total Plate Count (TPC) method was utilized to determine the number of bacteria in the samples. The fermentation process resulted in bacteriocin with the strongest antimicrobial activity when using low molecular weight liquid medium (LMWLM), followed by a series of refining process. From day 0-14, the number of S. typhimurium, in sample added with L. plantarum IBL-2 fermentation supernatant, was lower than control and sample added with Nissin. The most optimal antimicrobial activity of bacteriocin was obtained using LMWLM as fermentation media, and using a series of refining process consist of bacteriocin supernatant evaporation, membrane ultrafiltration, and gradual fractionation using 80% ammonium sulphate. Bacteriocin from L. plantarum IBL-2 showed antimicrobial activity against S. typhimurium.
The Antioxidant and Cytotoxic Effects of Cosmos caudatus Ethanolic Extract on Cervical Cancer Nurhayati, Betty; Rahayu, Ira Gustira; Rinaldi, Sonny Feisal; Zaini, Wawan Sofwan; Afifah, Ervi; Arumwardana, Seila; Kusuma, Hanna Sari Widya; Rizal, Rizal; Widowati, Wahyu
The Indonesian Biomedical Journal Vol 10, No 3 (2018)
Publisher : The Prodia Education and Research Institute (PERI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18585/inabj.v10i3.441


BACKGROUND: Oxidative stress is closely related to all aspects of cancer. Cosmos caudatus ethanolic extract (CCEE) has been proved to have antioxidant effect that inhibited cancer cell growth due to its bioactive compounds such as catechin, quercetin and chlorogenic acid. This study aimed to evaluate antioxidant and anticancer activity of CCEE and its compounds.METHODS: Total phenol was measured according to the Folin-Ciocalteu method. Catechin, quercetin and chlorogenic acid contained in CCEE were identified by high-performance liquid chromatography (HPLC). Antioxidant activity was evaluated by 2,2′-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS)-reducing activity, 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging activity, and ferric reducing antioxidant power (FRAP) activity test. The cytotoxic activity of CCEE was determined by MTS [3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium] assay on HeLa cells.RESULTS: The result showed that total phenol of CCEE was 181.64±0.93 µg Cathecin/mg extract. ABTSreducing activity test showed that catechin had the highest activity (2.90±0.04 µg/mL), while CCEE had moderate activity compared to other compounds. FRAP activity test demonstrated that catechin had the highest activity (315.83 µM Fe(II)/µg) compared to other compounds. DPPH scavenging activity of CCEE was 22.82±0.05 µg/mL. Cytotoxicity test on HeLa cell showed that CCEE had lower activity (inhibitory concentration (IC)50= 89.90±1.30 µg/mL) compared to quercetin (IC50 = 13.30±0.64 µg/ mL).CONCLUSION: CCEE has the lowest antioxidant activity compared to quercetin, catechin, and chlorogenic acid and has the lowest anticancer activity compared to quercetin. However, CCEE and its compounds has potential as antioxidant and anticancer properties.KEYWORDS: antioxidant, anticancer, catechin, Cosmos caudatus, quercetin