Plastic is a type of packaging that is often used in everyday life, however, in general, the plas... more Plastic is a type of packaging that is often used in everyday life, however, in general, the plastic used is synthetic plastic which takes a very long time to decompose. Bioplastic is an environmentally friendly plastic film made from organic materials so that it can decompose naturally with the help of microorganisms. This study aims to determine the effects which have the potential as a supporting material in increasing bioplastic characteristics such as thickness, water absorption and biodegradation. The research method was to use experiment and analysis of varian. Durian seed flour is carried out through a process of sorting, washing, stripping, soaking, slicing, drying, packing and storing. Meanwhile, the method of making bioplastics is done by mixing tapioca flour, cornstarch, durian seed flour of adding various durian seed flour: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 grams, distilled water, acetic acid and glycerin. The analysis results obtained on the test of bioplastic character...
Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely use... more Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely used in various medical applications, mainly in orthopedics and dentistry due to its close similarities with the inorganic mineral component of bone and teeth. This study aims to synthesize hydroxyapatite from duck eggshell using the precipitation method. The duck eggshell was calcined, hydrated (slaking) and underwent carbonation to form Precipitated Calcium Carbonate (PCC). Afterwards, (NH4)2HPO4 was added to produce HAp by varying the molar ratio of Ca/P by 1.67, 1.77 and 1.87 and stirring speed by 200, 250, 300rpm under basic condition (pH 10 – 11). The best results were obtained at a molar ratio of 1.77 with 200rpm stirring speed. Furthermore, the X-ray Diffraction (XRD) analysis showed that its crystals were hexagonal with sizes of 23.062nm, in the absence of other crystalline phases. Therefore, the hydroxyapatite was obtained in the agglomerates form with a specific surface area of ...
Liquid waste from processing cassava into tapioca starch is carbohydrate-rich waste and can be us... more Liquid waste from processing cassava into tapioca starch is carbohydrate-rich waste and can be used as a growth medium for the Acetobacter xylinum, which is useful in producing one of the fermentation products, i.e. nata. Several factors influence the production of nata, one of them is the addition of nutrients in the form of nitrogen in the fermentation medium. The nitrogen source used is usually from inorganic fertilizers, such as urea and ammonium sulfate. In this study, fermentation of tapioca starch wastewater was developed, using a natural sources of nitrogen derived from soybean and green bean sprouts extract. Nata was made by treating various concentrations of soybean and green bean sprouts extract (3%, 4%, 5%) and fermentation time (6 days, 7 days, 8 days, 9 days and 10 days). The characteristics of the nata product were seen from the thickness and yield of the nata. The nata de cassava product's optimum results were tested for thickness, yield, and moisture content. Th...
Plastic is a type of packaging that is often used in everyday life, however, in general, the plas... more Plastic is a type of packaging that is often used in everyday life, however, in general, the plastic used is synthetic plastic which takes a very long time to decompose. Bioplastic is an environmentally friendly plastic film made from organic materials so that it can decompose naturally with the help of microorganisms. This study aims to determine the effects which have the potential as a supporting material in increasing bioplastic characteristics such as thickness, water absorption and biodegradation. The research method was to use experiment and analysis of varian. Durian seed flour is carried out through a process of sorting, washing, stripping, soaking, slicing, drying, packing and storing. Meanwhile, the method of making bioplastics is done by mixing tapioca flour, cornstarch, durian seed flour of adding various durian seed flour: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 grams, distilled water, acetic acid and glycerin. The analysis results obtained on the test of bioplastic character...
Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely use... more Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely used in various medical applications, mainly in orthopedics and dentistry due to its close similarities with the inorganic mineral component of bone and teeth. This study aims to synthesize hydroxyapatite from duck eggshell using the precipitation method. The duck eggshell was calcined, hydrated (slaking) and underwent carbonation to form Precipitated Calcium Carbonate (PCC). Afterwards, (NH4)2HPO4 was added to produce HAp by varying the molar ratio of Ca/P by 1.67, 1.77 and 1.87 and stirring speed by 200, 250, 300rpm under basic condition (pH 10 – 11). The best results were obtained at a molar ratio of 1.77 with 200rpm stirring speed. Furthermore, the X-ray Diffraction (XRD) analysis showed that its crystals were hexagonal with sizes of 23.062nm, in the absence of other crystalline phases. Therefore, the hydroxyapatite was obtained in the agglomerates form with a specific surface area of ...
Liquid waste from processing cassava into tapioca starch is carbohydrate-rich waste and can be us... more Liquid waste from processing cassava into tapioca starch is carbohydrate-rich waste and can be used as a growth medium for the Acetobacter xylinum, which is useful in producing one of the fermentation products, i.e. nata. Several factors influence the production of nata, one of them is the addition of nutrients in the form of nitrogen in the fermentation medium. The nitrogen source used is usually from inorganic fertilizers, such as urea and ammonium sulfate. In this study, fermentation of tapioca starch wastewater was developed, using a natural sources of nitrogen derived from soybean and green bean sprouts extract. Nata was made by treating various concentrations of soybean and green bean sprouts extract (3%, 4%, 5%) and fermentation time (6 days, 7 days, 8 days, 9 days and 10 days). The characteristics of the nata product were seen from the thickness and yield of the nata. The nata de cassava product's optimum results were tested for thickness, yield, and moisture content. Th...
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Papers by Cory Dian Alfarisi