Processing of Red Dahlia Tubers in Produce Inulin Extract and Material Proximate Testing

Abstract

Dahlia tubers from Berastagi, North Sumatra, are plants that contain carbohydrates and contain high levels of inulin. Inulin is very good as a dietary fiber and has other physiological functions such as lowering blood sugar and blood fat, anticancer, regulating intestinal microbial flora, increasing absorption of minerals and vitamins. Currently, the utilization of dahlia tubers is not optimal in the community and is considered as agricultural waste, therefore it is necessary to manage dahlia tubers in producing inulin extract and study the proximate material, considering that previous studies still obtained varying results. This study aimed to obtain inulin extract and its yield value and to measure the proximate material of red dahlia tuber. The extraction method used is based on the solubility of inulin in water at a temperature of 800 C. And precipitation are carried out with 70% ethanol. Proximate examination of the material consisted of water content using the heating method, ash content using the gravimetric method, fat and crude fiber content using the Soxhlet method, determination of protein content using the Macro Kjedhal method, and carbohydrate content using the proximate method using the carbohydrate percentage formula. The results obtained were 48,25% Inulin Flour yield, the proximate results obtained 80,8% water content, 0,36% ash content, 0,33% total fat content, 1,29% crude fiber content, protein content 1,15%, Carbohydrate content 14.6%. From this study, it can be concluded that dahlia tubers contain high carbohydrates and low-fat content, have crude fiber and protein that can be used as low-calorie foodstuffs.

Study of Inulin Content and Extractions Methods in Several Types of Tubers: Review Paper

“…Dahlia tubers are known to be rich in fructooligosaccharides (FOS) and inulin [16]. Inulin is also a dietary fiber that performs various physiological functions, such as reducing blood sugar and body fat, controlling intestinal microbial flora, and increasing the absorption of calcium, minerals, and vitamins [17]. Research by [18] explore the Fe content and bioavailability of dahlia tuber syrup, and predicted high Fe bioavailability that could potentially improve the body's metabolism and reduce the risk of anemia.…”

“…The extraction of inulin from types of dahlia tubers can be seen in Table 1. One of the best ways to extract inulin from dahlia tubers is through solubilization of inulin in water at 80 degrees Celsius before precipitation with 70% ethanol [12]. Another study used microwave-assisted extraction with water as a solvent, which achieved a yield of 98.96 mol% at a temperature of 50 degrees Celsius, a charging concentration of 0.1 g/mL, and a reaction time of 50 minutes [22].…”

“…Proximate testing of dahlia tubers is commonly done. Water content using the heating method, ash content using the gravimetric method, fat and crude fiber content using the Soxhlet method, determination of protein content using the Macro Kjedhal method, and carbohydrate content using the Gravimetric method [12]. Dahlia tubers contain crude fiber and protein, high carbohydrates and low fat so they can be used as low-calorie food ingredients.…”

Response of Dahlia Photosynthesis and Transpiration to High-Temperature Stress

“…Dahlia is widely used as potted flowers, cut flowers, and garden plants, and because of its high inulin content, dahlia is also a high-quality raw material for the production of inulin and fructans [25]. Meanwhile, the petals of dahlia are excellent sources of flavonoids and floral pigment glycosides, and they can be eaten raw or made into salad.…”