Ilian Elvira
Universitas Halu Oleo

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Effectiveness of Post-Cooking Freezing and Lemongrass Fortification in Engineering Rice Starch Retrogradation to Reduce Glycemic Index and Starch Digestibility Andi Laila Nugrawati Mustarim; Muhammad Iqbal Kusumabaka Rianse; Ilian Elvira; Fitria Dewi; Fatahu; Adri Aningsih Fardila Putri
Journal of Food and Agricultural Product Vol. 6 No. 1 (2026): JFAP
Publisher : Fakultas Pertanian Universitas Veteran Bangun Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32585/jfap.v6i1.7955

Abstract

Rice as the main staple food in Indonesia has a relatively high glycemic index, which may increase the risk of metabolic disorders. Rice engineering through the retrogradation process is one approach that can be applied to reduce its glycemic index. This study aimed to evaluate the effectiveness of post-cooking freezing in engineering rice starch retrogradation to promote resistant starch formation and reduce glycemic digestibility. Freezing was conducted stepwise for 24, 48, and 72 hours. Retrogradation was analyzed through amylose absorbance measurement, while digestibility was evaluated by in vitro starch hydrolysis with glucose determination using a colorimetric method based on 3,5-dinitrosalicylic acid (DNS). The results showed that post-cooking freezing was able to reduce starch digestibility through the formation of retrograded structures. The hydrolysis index of all samples ranged from 2.79 to 4.60%, and the predicted glycemic index was in the range of 41.24–42.25, which falls into the low category. The pattern of digestibility changes showed an increasing trend at 24 and 48 hours of freezing, followed by a decrease at 72 hours. This digestibility profile formed a U-shaped pattern, which may be attributed to the dynamic nature of the retrogradation process during freezing. Keywords: functional rice, resistant starch, predicted glycemic index, starch hydrolysis, in vitro
Isolation and Identification of Microorganisms During the Spontaneous Fermentation Process of Cassava into Kabuto, a Traditional Food from Muna, Southeast Sulawesi Ilian Elvira; Baihaqi; Mariani L; Andi Dahlan; Nur Suci; Agry Anugrah Pertiwi
Journal of Food and Agricultural Product Vol. 6 No. 1 (2026): JFAP
Publisher : Fakultas Pertanian Universitas Veteran Bangun Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32585/jfap.v6i1.8043

Abstract

Kabuto is a traditional fermented food originating from Muna Regency, Southeast Sulawesi, Indonesia, made from cassava through a spontaneous fermentation process. The presence of microorganisms during fermentation plays an important role in the development of sensory characteristics such as flavor, aroma, texture, and ultimately determines the final quality of the product. This study aimed to isolate and identify microorganisms involved in the fermentation process of kabuto. Microbial isolation was conducted on days 0, 2, 4, and 6 of fermentation using the pour plate and spread plate methods on de Man, Rogosa and Sharpe Agar (MRSA), followed by incubation at 37 °C for 48 hours. The resulting colonies were enumerated using the Total Plate Count (TPC) method, and Gram staining was performed to determine the characteristics of bacteria present during fermentation. The results showed that the microbial population increased gradually throughout the fermentation process, reaching the highest count on day 6 at 1.68 × 10^8 CFU/g. Gram staining results indicated that the microbial population was dominated by Gram-positive bacteria, suggesting the presence of lactic acid bacteria as the primary microorganisms involved in fermentation. Gram-negative bacteria were detected at the early stage, likely originating from raw materials and the surrounding environment. The dominance of lactic acid bacteria has positive implications for product safety due to pH reduction and inhibition of pathogenic microorganisms. However, the presence of Gram-negative bacteria in the early stage indicates a potential risk of contamination if proper sanitation is not maintained. Therefore, process control and hygienic practices are essential to ensure the safety of kabuto. Further studies are recommended to perform molecular identification and evaluate food safety parameters. Keywords: lactic acid bacteria, fermentation, Kabuto