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- 검색키워드
- 저자 : Yusuf Dandy (검색결과 4 건)
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Dandy Yusuf,Lilis Nuraida,Ratih Dewanti-Hariyadi,Dase Hunaefi 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.5
Indonesian kefir grains are potential sources of lactic acid bacteria (LAB) that may act as probiotics with specific functional properties. In this study we explored the potential of the probiotic and cholesterol-lowering effect of LAB isolated from Indonesian kefir grains obtained from Bogor, Bandung, Jakarta, and Yogyakarta. The results revealed that 10 isolates showed considerable survivability at low pH and bile salt with total cell reduction of ~3 log colony-forming units per milliliter after exposure to pH 2.5 and 0.5% (w/v) bile salt for 1 and 3 h, respectively. All strains exhibited strong antimicrobial activities against pathogenic bacteria and were sensitive to a wide spectrum of antibiotics but exhibited weak bile salt hydrolase activity. Identification based on 16S RNA suggested that nine isolates were Lactobacillus kefiri and one was Lactobacillus rhamnosus. The ability of the isolates to reduce cholesterol from the media varied, ranging from 22.08% to 68.75% with the highest reduction shown by L. kefiri JK17. The ability to remove cholesterol from the media decreased greatly in resting and dead cells, ranging from 14.58% to 22.08% in resting cells and from 7.89% to 18.17% in dead cells. It can be concluded that Indonesian kefir grains contain LAB potentially acting as probiotics capable of reducing cholesterol. The cholesterol-lowering effect especially occurs when the cells are metabolically active.
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Potential of White Jack Bean (Canavalia ensiformis L. DC) Kefir as a Microencapsulated Antioxidant
Dandy Yusuf,Risa Kholifaturrohmah,Mochamad Nurcholis,R. Haryo Bimo Setiarto,Lutfi Anggadhania,Sulistian 한국식품영양과학회 2023 Preventive Nutrition and Food Science Vol.28 No.4
Oxidative stress plays a major role in the pathogenesis and progression of noncommunicable diseases. Kefir is a fermented food that has been reported to repress oxidative stress. This study aimed to assess the antioxidant activity, bioactive composition, and encapsulation efficiency of white jack bean (WJB) kefir. The following procedures were conducted: WJB was prepared and converted into juice using water solvent. The sterilized WJB juice was then fermented with kefir grain (10%) for 24∼72 h. Every 24 h, the kefir was evaluated for antioxidant activity, and the dominant bioactive component suspected to be the source of the antioxidant activity was identified. The final stage was the encapsulation process. WJB kefir showed high antioxidant activity, inhibiting DPPH radicals by 90.51±4.73% and ABTS radicals by 86.63±2.34% after 72 h of fermentation. WJB kefir contained 0.35±0.01 mg GAE/g total phenolics and 0.08 mg/g total flavonoids. The LC/MS identification suggested that the bioactive antioxidant components of the WJB kefir were from the alkaloid, saponin, phenolic, and flavonoid groups. The encapsulation with maltodextrin using freeze drying resulted in microencapsulation of WJB kefir with a particle size of 6.42±0.13 m. The encapsulation efficiency was 79.61%, and the IC50 value was 32.62 ppm. The encapsulation method was able to maintain the antioxidant stability of the kefir and extend its shelf life. WJB kefir, a nondairy, lactose-free kefir, can be used as an antioxidant functional food.
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Yusuf Dandy,Setiarto Raden Haryo Bimo,Febrisiantosa Andi,Firmansyah Angga Maulana,Kurniawan Taufik,Setiyawan Ahmad Iskandar,Wahyuningsih Rina,Ujilestari Tri,Rakhmatulloh Satyaguna,Rizqiati Heni 한국미생물·생명공학회 2024 한국미생물·생명공학회지 Vol.52 No.2
The microbial starter used to produce kefir beverages, kefir grain, contains a microbial exopolysaccharide called kefiran. Kefir grain consisting of water-insoluble polysaccharides, proteins, and fats, which can be applied as a multi-functional biopolymer. The mass of kefir grain can increase in the fermentation process of Kefir, but it is considered very slow. The purpose of this research is to study the impact of ammonium sulfate supplementation and yeast extract on reconstituted skim milk to increase the mass kefir grain and physical properties of kefiran. Results showed that the ammonium sulfate-supplemented substrate increased the mass of kefir grain by 547% in 14 days, with the condition that the substrate must be renewed every 2 days. Refreshing the substrate is considered one of the important factors. Supplementation on substrate did not appear to affect the viability of bacterial and yeast cells. Kefir grain produced from supplemented substrate also yields better thermal stability properties and has more functional groups than without supplementation. Two Lacticaseibacillus rhamnosus (RAL27 and RAL43) and one Limosilactobacillus fermentum (RAL29) were found to produce EPS. The three isolates also showed good skim milk fermentation ability after purification from kefir grain. The kefir grain produced in this study has the potential for wider application. This study also showed that kefir grain can be adjusted in quantity and quality through fermentation substrate engineering
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Anggadhania Lutfi,Setiarto R. Haryo Bimo,Yusuf Dandy,Anshory Lutfi,Royyani Mohammad Fathi 한국식품연구원 2023 Journal of Ethnic Foods Vol.10 No.-
Tempoyak is a traditional Indonesian fermented durian paste that is popular among the Malay ethnic community. While tempoyak is a distinctive, culturally significant culinary item in multifarious Indonesian cuisine, it remains understudied compared to other fermented foods like kimchi. Further research is called for to understand tempoyak’s microbial structure, dynamics, and potential health advantages that include immunostimulants, antihypercholesterolemia, probiotic action, preservatives, and antibacterial. Researchers can also reveal significant information on the history, ethnicity, production, microbiological challenges, nutritional and functional qualities, and future possibilities of indigenous food, including tempoyak. This research aimed to explore and investigate tempoyak as an indigenous fermented food by integrating a systematic literary research and data from earlier investigations. Tempoyak is closely associated with Malay identity, regardless of the place they dwell. As an essential part of everyday life in Malay community in Indonesia, tempoyak is commonly served at traditional ceremonies, wedding festivities, or large-scale events. This cultural importance makes Indonesian tempoyak distinct from its Malaysian counterpart. Tempoyak is made by crushing durian flesh, adding salt into it, and letting the homogeneous mixture sit at room temperature in a covered container for 4–7 days. The microfloras present in tempoyak are varied but primarily Lactobacillus sp., notably Lactobacillus plantarum . Proximate analysis is a viable method to assess the nutritional composition of tempoyak. Variations in nutritional content may occur due to differences in durian types, salt composition, sterilization time, temperature, and fermentation duration. Potential avenues for further studies include the role of tempoyak in fostering sustainable food systems, other health advantages of ingesting tempoyak, and the creation of novel tempoyak-based products. These study directions will further enhance the discipline and contribute to the preservation and promotion of Malay culinary heritage.
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