By: 1Setyawardani, T., 2*Rahayu, W. P., 3Maheswari, R. R., and 2Palupi, N. S.
1Department of Animal Production, Faculty of Animal Science, Jenderal Soedirman University, Indonesia, 2Department of Food Science and Technology, Faculty of Agricultural Engineering and Technology, Bogor Agricultural University, Campus IPB Darmaga, PO Box 220, Bogor 16002, Indonesia. 3Department of Animal Production and Technology, Faculty of Animal Science, Bogor Agricultural University, Indonesia

To be categorized as probiotic bacteria, lactic acid bacteria (LAB) must have at least antimicrobial activity and adhesion ability on intestinal mucosal surfaces. The aim of this study was to determine the antimicrobial activity and adhesion ability of eight LAB strains isolated from goat milk. The isolates passed initial selection on low pH (2.0, 2.5, and 3.0) and bile salt tolerance (0.3% Oxgall). Three strains of L. rhamnosus (TW2, TW3, TW32); five strains of L. plantarum (TW4, TW10, TW14, TW26, and TW28) were examined for their antimicrobial activity against both spoilage and pathogenic bacteria (S. Typhimurium ATCC 14028, E. coli ATCC 8739, B. cereus ATCC 13061, S. aureus ATCC 25923 and     P. aeruginosa ATCC 9027). Five isolates (TW2, TW4, TW14, TW28, and TW32) were evaluated for their ability to adhere to intestinal mucosal surfaces. A modified well diffusion method was used to assess the antimicrobial activity. A modification of an animal model was also used to analyze the LAB adhesion ability. The adhesion of the bacteria on jejunum and ileum was examined by using Scanning Electron Microscope. The result showed that the isolates had diameters of inhibition ranging from 12.6 to 19.9 mm for      S. Typhimurium, 11.3 to 21.4 mm for E. coli, 7.5 to 19.9 mm for B. cereus, and                9.9 to 24.7 mm for P. aeruginosa. L. plantarum TW10 and TW26 had no inhibition activity for S. aureus. The adhesion ability of the bacteria was 0.54-2.19 log CFU/cm2 on the intestinal mucosal surfaces. The highest adhesive level in jejunum and ileum was showed by L. rhamnosus TW2.

Keywords: adhesion ability, antimicrobial, lactic acid bacteria, goat milk

Published at Int. Food Res. Journal 1(3): 959-964. 2014. ISSN 19854668/e:22317546

{Abstract} PEMENUHAN REGULASI PELABELAN PRODUK INDUSTRI RUMAH TANGGA PANGAN (IRTP) DI BOGOR (Fulfillment of Food Labeling Regulations for Small Medium Enterprises (SMEs) Products in Bogor)

By: Wijaya, WA and Rahayu WP

Department of Food Science and Technology, Bogor Agricultural University

A food label is an important tools for food trade activities, thus it required to be regulated and controlled so the information about the food that delivered to the public was true and not mislead. This research was a descriptive research with aimed to evaluate the degree of fulfillment of food product labels of Small Medium Enterprises (SMEs) in Bogor compared with existing regulations (Indonesian Act Number 18 of 2012). Samples were chose from three majority of SMEs products in Bogor, there were flour products and its processing; products from the process of grains and tubers; and softdrink and powdered beverages products. Four group of element were tested: 1) technical labeling, 2) format content, 3) minimum information, and 4) prohibited information. The results showed the level of fulfillment for those three types of products were: 1) technical labeling: 44, 45, and 73%, 2) format content: 75, 80, and 60%, 3) minimum information: 69, 64, and 66%; and 4) prohibited information: 99, 100, 96%, respectively. The average level of fulfillment for those three types of products were 72, 72, and 74%, respectively. This low result of level of fulfillment showed that it still need further development of SMEs, especially about food labelling criteria according to the existing regulations.

Keywords: Label, level of fulfillment, regulations, SMEs

Dimuat di Jurnal MUTU PANGAN 1(1): 67-73. ISSN 2355-5017. 2014.

{abstract} DAMPAK KONDISI EKSTRIM SUHU DAN KELEMBABAN TERHADAP PERTUMBUHAN Aspergillus flavus DAN PEMBENTUKAN AFLATOKSIN PADA KEDELAI (Impact of Extreme Condition (Temperature and Relative Humidity)for Aspergillus flavus Growth and Aflatoxin Production on Soybean)

By: Rahayu WP1),2), Broto W3), Ambarwati S4), Dian Herawati1),2), Lioe HN1), Pratiwi C5). 1)Department of Food Science and Technology-IPB, 2)SEAFAST Center-IPB, 3)Agency for Research and Development of Agricultural Postharvest, Ministry of Agriculture. 4)SEAMEO BIOTROP, 5) Food Science Post Graduate Student.

 http://www.clt.astate.edu/mhuss/Aspergillus flavus pict.jpg

http://www.clt.astate.edu/mhuss/Aspergillus flavus pict.jpg

Aspergillus flavus producing aflatoxin is found contaminating crops such as soybean. The growth of this mold on soybean and other food is affected by temperature and relative humidity (RH). The aim of this study was to measure the growth and aflatoxin production of A.flavus at different temperature and relative humidity. A. flavus Bio 2237 was inoculated on  medium namely Czapek Dox Agar (CDA), and soybean,  and incubated for 10 days at 20, 30, 40oC and RH 70, 80, 90%, respectively. Aflatoxin analysis was conducted using RP-HPLC equipped by fluorescent detector and post column photochemical reactor. These instruments had LoD 0.45, 0.26, 0.05, and 0.13 ppb, while the LoQ were 1.50, 0.88, 0.18, and 0.43 ppb,  for aflatoxin B1, B2, G1, and G2 respectively. Optimum growth for  A. flavus Bio 2237 on CDA medium and soybean were reached at 30oC with RH 90%. Maximum aflatoxin (999 ppb) production on soybean was reached at those conditions as well. A. flavus could not grow as well as produce aflatoxin at extreme condition (40ºC and RH70%) on soybean.


Keywords: aflatoxin, Aspergillus flavus, extreme condition, soybean.

 Dipresentasikan pada Seminar Hasil Hasil Penelitian IPB, 23-24 Desember 2013.


{abstract} MODIFIKASI PATI GARUT (Marantha arundinacea L) DENGAN PERLAKUAN HIDROLISIS ASAM DAN SIKLUS PEMANASAN-PENDINGINAN UNTUK MENGHASILKAN PATI RESISTEN TIPE 3 (Modification of Arrowroot (Marantha arundinacea L.) Starch Through Acid Hydrolysis and Autoclaving-Cooling Cycling Treatment to Produce Resistant Starch Type 3)

patiBy: Faridah DN, Rahayu WP, Apriyadi MS (Department of Food Science and Technology. Bogor Agricultural University).

Arrowroot starch can be modified to produce resistant starch (RS), which have been observed to show physiological functions similar to dietary fiber. Acid hydrolysis and autoclaving-cooling cycling treatments can increase RS content. Arrowroot starch modification hydrolyzed by 1.1 and 2.2 N HCl for 0, 2, 4, and 6 hours, then continued with3 cycles of autoclaving-cooling treatment. Based on the starch digestibility, the acid hydrolyzed starch by 2.2 N HCl for 2 hours and 3 cycles of autoclaving-cooling cycling treatment had the lowest digestibility (22.04%). This treatment also increased amylose, dietary fibre, and RS contents. The increase of the amylose contents contributed to increase the total dietary fibre and RS contents up to 4.1 and 4.4 times, respectively, than native starch.

Key words: acid hydrolisis, arrowroot, autoclaving-cooling, resistant starch.

Dimuat di:   J. Tek. Ind. Pertanian 23(1): 61-69. 2013


 http://www.clt.astate.edu/mhuss/Aspergillus flavus pict.jpg

edu/mhuss/Aspergillus flavus pict.jpg

By: Winiati P. Rahayu (Department of Food Science and Technology, Bogor Agricultural University).

Mycotoxin is widely known as one cause of the foodborne disease, produced by toxigenic fungi. Its prevalence becomes higher with the availability of supporting conditions such as proper climatic changes, plentiful substrates, and minimum controls. Any country should be aware about this high risk potency in order to maintain food safety and food security by knowing the mycotoxin, the affected commodities, the fungal sources, and  the toxicity effect to human or animal. Indonesia has made some regulations regarding the contamination of mycotoxin to food or feedstuff, including Aflatoxin, Fumonisin, Deoxynivalenol (DON), Ochratoxin, and Patulin (PAT). Besides controlling through regulations, many studies  controlling mycotoxin have also been done throughout the world.   The using of microorganism or metabolite compounds produced by microorganism as biological agent has many advantages such as mild reaction conditions, target specificity, efficiency and environmental friendly. Some microbial strains has been developed as commercial biological agent product including Aspergillus flavus AF36, A. flavus strain NRRL21882, etc. The microbial characteristic used for biological agent should be evaluated including the inability to produce toxic substance, the tendency to multiply, colonize, survive, the safety, and applicability to the environment. Studies related to mycotoxin biocontrol by using microorganism can be focused on (1) the effect to the mycotoxin, (2) the growth of microorganism, or (3) the application to food both raw material and processed products. Consideration to combine more than one species of microorganism instead of a single species also has been taken to gather the possibility of achieving more effective.  For example, Yeast (S. cerevisiae) has been used together with bacteria (LAB) to take control on mycotoxin produced by some fungi. Further studies are still needed to develop the possibility of other biological control agents and the effect of their application, which in the next have the potency to be developed as manufacturing products.

Keywords: alternatives, advantages, biological agents, mycotoxin biocontrol

Presented at International Conference on Mycological Aspects of Food and Feed Safety, Yogyakarta, 27-28 June 2013


[abstract] EFFECT of KEBAR GRASS (Biophytum petersianum) LEAF EXTRACT on THE GROWTH AND STRUCTURE of AFLATOXIGENIC Aspergillus flavus


Source: Private collection

By: Meike M Lisangan1,2, Rizal Syarief1, Winiati P Rahayu1, Okky S Dharmaputra3,4(1 Faculty of Agricultural Engineering and Technology, Bogor Agricultural University, 2  Faculty of Agricultural and Agricultural Technology, The State University of Papua, 3  Faculty of Mathematics and Natural Sciences, Bogor Agricultural University4Southeast Asian Regional Centre for Tropical Biology (SEAMEO BIOTROP)- Indonesia)

The objective of this study was to investigate the chemical composition and antifungal activity of kebar grass polar extract and its effect on the mycelial growth, conidiation and  morphological structure of two isolates of aflatoxigenic Aspergillus flavus, i.e. isolates BCCF0219 and AF1. A total of 64 components were identified using pyrolysis/gas chromatography/mass spectrometry (Py/GC/MS), consisting of a class of carboxylic acids (7.81%), amina (1.56%), phenolics (26.56%), terpenes (15.60%), alcohols (10.94%), hydrocarbons compounds (20.3 %), benzene derivatives (6.25%), carbohydrate derivatives (4.69%), steroidal saponin (1.56%),  haloalkane (1.56%), and sterols (3.13%).In the bioassay, the two isolates of A. flavus were cultured on three  types of model media, i.e. fat-enriched medium, protein-enriched medium and carbohydrate-enriched medium containing five concentrations (12, 14, 16, 18, and 20 mg/mL) of kebar grass polar extract.  The changes of hyphae structure and conidiation were observed usingScanning Electron Microscopy (SEM). The results showed that the percentage of growth inhibition of A. flavus isolate BCCF0219 caused by kebar grass polar extracts at a concentration of 14 mg/mL was 95.5% (in fat-enriched medium), whereas at a concentration of 12 mg / mL was 95.7% (in carbohydrate-enriched medium) and a concentration of 14 mg/mL was 91.0% (in protein-enriched medium).  The percentage of growth inhibition of A. flavusisolate AF1 caused by the extract at  a concentration of 16 mg/mL was 100% (in fat-enriched medium),while at a concentration of 12 mg / mL was 91.4% (in carbohydrate-enriched medium) and at a concentration of 16 mg/mL was 94.3% (in protein-enriched medium). A marked retardation in conidial production of the fungus was noticed in relation to the inhibition of mycelial growth. Under scanning electron microscopy, deformation of hyphae tips, formation of short branches, thinner hyphae, folded hyphae and collapse of entire hyphae were the major changes observed.  Morphological alterations might be due to the effect on cell permeability through the direct interaction between kebar grass extract and the fungal plasma membrane. These findings indicate the potential of  kebar grass leaf extract in preventing aflatoxigenic A. flavus infection  and minimize aflatoxin contaminationin stored food and feedstuff.


Keywords: Aspergillus flavus, Biophytum petersianum, growth inhibitor, morphological structure, Scanning Electron Microscopy

Presented at International Symposium on Tropical Fungi, Mikoina. Bogor 10-11 September 2013





Source: private collection

By:  Nurheni Sri Palupi 1),  Triana Setyawardani 2) and Winiati P Rahayu 1)

1)Department of Food Science and Technology  and SEAFAST Center- Bogor Agricultural University, 2)Faculty of Animal Science, Jenderal Soedirman University

Probiotic is live non-pathogenic microorganisms that give beneficial effects on health when they are administered in adequate amounts.  The objective of the study was to evaluate the influence L. rhamnosus TW2 and L. plantarum TW14 as well as cheese containing the probiotics on the profiles of microflora, morphological profile of ileum and caecum, lymphocyte proliferation and IgA levels in mice. Male SD rats was fed with the probiotics or cheese containing the probiotics for 10 days, infected with S. Typhimurium for 3 days, and continued to be fed with or without the probiotics or the cheese. Additionally a group of mice with standard feeding was used as control group. The results showed that the number of total lactic acid bacteria in the ileum and caecum in probiotic fed mice was higher than control, whereas the number of S. Typhimurium was lower. The growth of S. Typhimurium was completely inhibited when the mice were continuously given probiotics post-infection. Treatment of probiotic isolate was able to improve the number of lymphosite cellsduring the first 10 days, during infection with S. Typhimurium, and postinfection. Treatment of probiotic isolate was able to improve sIgA at the time of S. Typhimurium intervention. In conclusion, mixed isolates of L. rhamnosus TW2 and L. plantarum TW14 and cheese containg the probiotics were able to show preventive and remedial functions during S. Typhimurium ATCC 14028 infection, thus demonstrate the potential immunomodulatory.

Key words: Immunomodulatory, IgA, L. rhamnosus TW2, L. plantarum TW14, probiotic

Presented at 13th Asean Food Conference, SIFST (Singapore Institute of Food Science & Technology), Singapore 9-11 September 2013





Source: Private collection

By: Winiati P. Rahayu, Made Astawan, Tutik Wresdiyati*, and Sandra Mariska

Department of Food Science and Technology, Faculty of Agricultural Technology and Engineering, Bogor Agricultural University,
(*) Department of Anatomy, Physiology, and Pharmacology, Faculty of Veterinary Medicine, Bogor Agricultural University

The objective of this research was to utilize the local probiotic lactic acid bacteria, isolated from beef in some traditional markets in Bogor (L. plantarum 2C12 and L. fermentum 2B4), in synbiotic yogurt making and analyzing its antidiarrheal and antioxidative capability in rat models. The  rats  were  treated  with  synbiotic  yogurt  and  enteropathogenic Escherichia  coli (EPEC) intervention. The antidiarrheal parameters were the appearance and the gravimetrically water content of the rats’ feces. The normal feces was round or oval, black, and hard or soft with lower fecal water content. The diarrheal feces was not round nor oval, liquid or unformed, brownish, and soft or slimy with higher fecal water content. The antioxidative parameter was immunohistochemically  superoxide dismutase  (SOD)  content  in  liver  and  kidney  tissues, shown by brown color in nucleus. This synbiotic yogurt showed antibacterial and antidiarrheal activities in the rat’s model. This research shown that the feces of the rats, which were infected by EPEC and treated by synbiotic yogurt contained L. fermentum 2B4 was normal, specifically oval, black, and soft feces. Whereas, the rats which were infected by EPEC, but were not treated by the synbiotic yogurt shown the diarrheal feces. The synbiotic yogurt also had antioxidative effect. For 21 days treatment with synbiotic yogurt to the EPEC intervention rats, the Cu, ZnSOD content in the liver and kidney increased, 17.72 and 24.96% respectively higher than the rats that were not treated with it.

Published in International Food Research Journal (IFRJ) University Putra Malaysia. Available online at: http://www.ifrj.upm.edu.my

International Food Research Journal 20(2): 703-709 (2013)



Source: private collection

By: Reggie Surya and Winiati P. Rahayu

(Department of Food Science and Technology, Bogor Agricultural University)

Tempe is a traditional Indonesian food product derived from fermented soybeans using Rhizopus oligosporus. Tempe has many advantages, such as good nutritional value and organic compounds contributing to human health. Tempe’s key benefitsare related to its excellent protein content,
high levels of essential fatty acids, numerous vitamins and minerals, dietary fibres and isoflavones. Tempe extract (tempe milk) is an example of a diversified tempe-based food. The purpose of this study is to produce canned tempe-extract. This study determined the sterilization time, nutrition facts, isoflavone contents, antioxidant capacity and production feasibility of canned tempe-extract. The results showed that the most favourable formula was tempe extract with 7%(w/v) honey as sweetener. The time needed to sterilize the canned tempe-extract (can size 202×308) was 25 minutes after the activation of the retort to reach sterilization level equivalent to Fo value of 2.62 minutes. The sterilization process did not affect the sensory characteristics of canned tempe-extract significantly. The proximate analysis results showed that canned tempe extract contained 90.27% water, 0.06% ash, 3.66%protein, 0.98% fat and 5.03% carbohydrate. The isoflavones analysis results showed that canned tempe-extract contained total isoflavones of 5.09 mg/100g. The canned tempe-extract had antioxidant capacity of 7.13 mgAEq/150ml, which
means 150 ml canned tempe-extract had equivalent antioxidant capacity to 7.13 mg ascorbic acid. The economic study showed the production of canned tempe-extract was feasible.

Published in Asian Journal of Food and Agro-Industry. ISSN 1906-3040. Available online at www.ajofai.info

As. J. Food Ag-Ind. 2012, 5(04), 299-306


bang tagor

Source: Nissa collection

By: Mochamad Sobich Maimun and Winiati P. Rahayu

(Department of Food Science and Technology, Bogor Agricultural University)

Elementary students are the most susceptible ages to foodborne diseases, due to most of them do not get adequate information about food safety. In 2009, National Agency for Drug and Food Control (NA-DFC) confirmed that 26.09% of food poisoning outbreaks happened at school; and 19.13% were caused by street foods. This research aimed to find out the effectiveness in dissemination of food safety information by using dazzling educative media which was modified wayang golek, called “Bang Tagor”, to 4th and 5th graders of elementary school. The education was conducted by using  story telling on wayang golek “Bang Tagor” stage, food safety posters, booklets, and interactive games which were related to food safety and health. Research has been done from February to June 2012 at two targeted schools by observing and spreading questionnaires to 75 respondents. Program effectiveness was measured based on cognitive, affective, and psychomotor aspects. As the result, the perception of students on food safety and health sharply increased to 15,32% and there were several positive attitude changes after the program.

Published in The 19th Tri-University  International Joint Seminar & Symposium 2012 (Oct.  21- 26, 2012 Bogor Agricultural  University, Indonesia)