Abstract Sweet potato is a local food ingredient that needs to be preserved and its benefits are because it contains a high source of starch with anthocyanins. The utilization of local ingredients is still rarely used due to limited knowledge of sweet potato processing techniques. The purpose of this study is to create innovations by developing purple sweet potato food cultivation as a natural dye in the formulation of yogurt products through hedonic testing. The research was conducted using a Randomized Block Design (RAK) method with 4 treatments consisting of 4 levels, namely A = 0 mg, B = 5 mg, C = 10 mg dan D = 15 mg, repeated 3 times. The most preferred yogurt by the panelists was yogurt with 15 mg of purple sweet potato extract added, with a value of 3.78 for taste, 3.01 for flavor and 3.53 for color. With a protein content of 4.76 gr, fat 12.60 gr, 13.2 gr, anthocyanins 14.42 mg (in 100 mL), and antioxidant activity of 3851.13 ppm.

Abstract A method that can detect colorant type in food is requisite against illegal practices that used non-food-grade colorants in food. In this study colorant types of yellow tofu were identified using visible near-infrared (Vis-NIR) and shortwave near-infrared spectra (SW-NIR) spectroscopy. Chemometrics analysis using partial least square-discriminant analysis (PLS-DA) and principal component analysis-linear discriminant analysis (PCA-LDA) were used to classify natural colorants, non-food-grade colorants, and food-grade colorants in yellow tofu. The best model obtained using Vis-NIR had calibration accuracy and reliability of 100% for both PCA-LDA and PLS-DA. The best model yielded by SW-NIR had calibration accuracy of 76% and 28% reliability for PLS-DA, and accuracy of 92% and 76% reliability for PCA-LDA. The result showed that Vis-NIR spectroscopy was superior to SW-NIR spectroscopy to distinguish the colorant type used in yellow tofu. Moreover, PCA-LDA yielded better accuracy and reliability compared to PLS-DA.

Abstract Sago starch can be processed into flour and used as an alternative food ingredient to replace wheat flour. The lack of innovation in sago products is due to the very low protein and fat content of sago. Increasing the nutritional value of sago can be done by fortifying anchovies as a source of protein. This study was conducted to determine the effect of anchovy flour fortification on the physical, chemical, and sensory qualities of noodles. The study used a one-factor Completely Randomized Design. The results showed that with increased fortification of anchovy meal, the nutritional content of protein, fat, and noodle ash increased significantly. Rehydration power 34% to 52%, color intensity L* 42,87 to 55,70; redness a+ 1,91 to 2,85; and b+ yellowish 7,19 to 10,39, elongation 214,81 to 294,93. The composition of noodles with 9% anchovy flour fortification can be used to increase the nutritional content of noodles with physical and chemical characteristics, namely 4,08% protein content, 0,38% fat content, and 3,11% ash content. The sensory quality of noodle texture was 3,94; taste 3,32; and fragrance 4,66.

Abstract Sago is a carbohydrate-producing food commodity in large quantities but has a low protein content. The interaction of protein and carbohydrates in sago noodles is expected to help improve nutritional value. Therefore, this study was conducted to determine the effect of the fortification of skipjack tuna fish meal in increasing the quality of sago noodles. Experimental design using a completely randomized design of one factor, namely the fortification of fish meal with five levels (0%, 8%, 10%, 12%, and 14%). Sago noodle characteristics with the fortification of fish meal were investigated. Result evaluation showed that the fortification of fish meal had the optimum concentration that can be used to increase the nutritional content of sago noodles is fortification of fish meal 14% with chemical characteristics, namely 2.16% ash content, 7.70% protein content, and 0.17% fat content.

Abstract In the production of gluten-free noodles by using a single screw extruder, cooking is done at two consecutive stages. Initially, the dough of gluten-free formula is steamed manually at certain times and temperatures. During extrusion, the pre-cooked dough is re-cooked inside the extruder barrel. The purpose of this study was to evaluate the properties of gluten-free noodle (color, texture profile) produced from different production batches (batch 1 to 6) of two different single screw extruders (A: capacity 24 kg/hr, B: capacity 12 kg/hr) by using a single factor completely random design. The results showed that steaming process in batch cause intermitten time for extrusion and affected some non-uniform properties of the gluten-free noodles produced by the two extruders. The two extruders produced noodles with distinctive properties. The noodles from extruder A exhibited the hardness (average 26,925.14 ± 2,355.74gf) and adhesiveness (-7.66 ± 6.41 gs). The noodles of extruder B showed the elongation (157.91 ± 39.67%) and cohesiveness (0.91 ± 0.02).

Abstract Aloe vera rind contains antioxidant active components that can be used as raw materials for making herbal teas. The purpose of this study was to obtain the optimal formula for making herbal tea drinks made from aloe vera rind with a mixture of mint leaves and cinnamon by using the Expert Design 12 program with the D-optimal Mixture method. The formulations studied were obtained from the upper and lower limits of each raw material, so 16 formulas were obtained. Each quality formula was tested chemically and physically (lightness, antioxidant activity) and organoleptic (taste, color, odor, and overall), then the optimization stage was carried out to obtain the most optimal formula by determining the desired response value criteria. The optimal formula of herbal tea that has been selected by the Design Expert program with the Mixture D-optimal method with component proportions of 65,79% aloe vera rind, 30% mint leaf, and 4,21% cinnamon, has a desirability value of 0.604. Herbal tea has a green color, with a strong odor and a non-bitter taste.

Abstract This study aimed to evaluate the physicochemical characteristics and mineral contents of dried extract of Averrhoa bilimbi and its antioxidant and antibacterial properties. Dried extracts leaves powder of A. bilimbi were analysed for its physicochemical properties and mineral compositions. The antioxidant and antibacterial capacities of extracts were determined by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay and the disc diffusion method respectively. The functional groups from active compounds were identified by Fourier Transforms Infrared Spectrophotometer (FTIR). Physicochemical characteristics of A. bilimbi dried extracts, including pH and total acids dissolved in water and ethanol solvents, showed negligible differences. The dried leaves powder of A. bilimbi was rich in carbohydrate, protein, and ash contents. It also exhibited essential minerals in which potassium was the highest content. Compared to water, ethanol extract showed more scavenging property against DPPH (82.82 mg GAE/ g DW) and gave a more inhibitory effect on the growth of Salmonella sp., Escherichia coli, and Staphylococcus aureus. The FTIR spectra showed phenolic compounds might be associated with the antioxidant and antibacterial activities of this extract. A. Bilimbi leaves are promising a source for the development of functional food to prevent diseases related to stress oxidative and bacterial infections.