Increasing the Yield of Powder and Bioactive Materials during Extraction and Spray Drying of Dragon Fruit Skin Extracts

One potential utilization of dragon fruit skin is to produce bioactive materials as natural antioxidants and colorants for the food industry by extraction and spray drying. This study investigated the quality (total phenolic compounds/TPC, betacyanin and betaxanthin contents, and antioxidant activity) of the extracts and spray-dried products, and the quantity (powder yield) obtained by the use of different types and amounts of spray drying agents. Two drying agents were introduced during spray drying, i.e. maltodextrin and whey protein isolate (WPI). The result showed that a lower extraction solvent to solid ratio may result in a lower yield of TPC, betacyanin and betaxanthin contents, and also in antioxidant activity of the dragon fruit skin extract. In addition, maltodextrin and WPI were found to be able to significantly increase the yield from spray drying. The highest yield (72.7 ± 8.4%) was obtained with the use of 40% maltodextrin as drying agent, while the control yielded 9.5 ± 1.8%. Furthermore, it was found that the spray-dried product could recover more than 90% of the TPC and betacyanin in the extracts, which indicates that spray drying may be suitable for heat-sensitive materials

Produksi Ekstrak Bioaktif Untuk Aditif Pangan Dari Limbah Kulit Buah Naga: Pengaruh Metode Pre-Treatment Dan Ekstraksi

Dragon fruit is one of the tropical fruits can be grown in Indonesia. The skin of dragon fruit, which is accounted for 30-35% of the whole fruit usually thrown away as waste. This study aims to produce a bioactive extract from extraction of dragon fruit skin that is rich in phenolic and pigment compounds then it used as food additives. The variation that was used in this study includes the application of drying as pre-treatment of dragon fruit skin and the extraction methods (maceration and Soxhlet extraction). The obtained extracts were evaluated for the amount of total phenolic compounds and pigments (anthocyanin and betacyanin). Drying of dragon fruit skin was found to yield lower amounts of bioactive materials, which may occur due to the thermal degradation even though a low drying temperature was used. In addition, the maceration method was found to give a higher amount of bioactive materials compared with the Soxhlet method. The extraction with the highest yield of bioactive materials was obtained by the use of fresh dragon fruit skin and maceration for 240 minutes, which gave amounts of anthocyanin, betacyanin, and total phenolic compounds of  0.08, 0.04, dan 0.35 mg/g fresh dragon fruit skin, respectively

Calcium soap from palm fatty acid distillate for ruminant feed: Calcium oxide particles size

High production of crude palm oil has led Indonesia to become one of the countries that have a large number of palm fatty acid distillate (PFAD) in the world. As a source of fatty acid, PFAD has wide range of uses, including as a fat supplement in the ruminant feed when reacted with a calcium source such as calcium oxide (CaO). At the working temperature above PFAD’s melting point, those reactants form a homogeneous phase with the help of intensive stirring. By the presence of a small amount of water, the mixture will be saponified and become the calcium soap. This research studied how different particles sizes of CaO could influence the reaction conversions based on the acid value of the product. The CaO solid particles were sieved and separated into the different fraction of sizes (<177 μm, 177-320 μm, and 320-640 μm). Smaller particle resulted in a lower acid value which indicates a high conversion of free fatty acid and lower moisture content which is preferable for the product

WASTES TO PRODUCTS: TOWARDS NEW HIGH-VALUE PRODUCTS FROM EXTRACTION OF CITRUS PEEL AND SPRAY DRYING OF THE EXTRACTS

This work has investigated the production of natural antioxidants from citrus peels, which is intended to lower the environmental impacts from the disposal of the waste and also to make additional profit for the citrus fruit industry. Regarding the extraction method, it has been found in this study that MAE could reduce the extraction time and increase the maximum extractable phenolic compounds. Furthermore, the spray-drying experiments to produce Navel orange peel extract powder resulted in yields of between 75% and 92% and the total phenolics content (TPC) recoveries of between 89% and 92%.This result suggested that spray drying is a suitable process for the drying of heat-sensitive materials, such as phenolic compounds. A technico-economic evaluation for the combined processes of MAE and spray drying to produce antioxidant powder has also been discussed. Using the current economic parameters in Australia dan China, this process appears to be economically feasible. In comparison with the production of liquid extracts, the result shows that the spray-drying process could increase the COM of the whole process by around 30-40%. However, the powder form is expected to have better storage stability and also lower storage and transportation costs. Apart from the benefits of antioxidants, bioactive materials have also been reported to show pro-oxidant activities. The study of how processing the extracts, specifically spray drying them, affects the balance between pro-oxidant and antioxidant behavior is novel and significant in terms of modern trends in medicine. Higher main air flow rates resulted in lower pro-/antioxidant recovery ratios, and increases in the feed pump rate improved the pro-/antioxidant recovery ratios, due to their effects on the moisture content and oxidation time. These results are significant due to the developing modern medical understanding that too many antioxidants can be detrimental to health, so it is the balance between antioxidant and pro-oxidant effects in materials that is most important in foods and other compounds for human consumption

Betalain extracts: Drying techniques, encapsulation, and application in food industry

Abstract One of the important food additives used in the food industry is betalain, which is applied as a natural dye. Red beet is the most common resource of betalain. To increase its shelf life, encapsulation followed by drying is commonly carried out. However, betalain is a heat‐sensitive pigment that is susceptible to degradation on thermal exposure. Moreover, drying could affect the color, shape, structure, nutrition, and content of other ingredients in betalain. This review paper provides a discussion of (1) various drying methods such as spray drying, freeze drying, vacuum drying, and their effects on the quality of the dried betalain products; (2) stability and properties of betalain pigment obtained by encapsulation using different carrier agents such as maltodextrin, gum arabic, starch, inulin, and protein; (3) several drying pretreatment and posttreatment processes to improve the recovery and stability of betalain such as extraction and optimum storage conditions. Additionally, a summary and future perspectives for further research are also provided in each section of drying methods

Calcium soap from palm fatty acid distillate for ruminant feed: Calcium oxide particles size

High production of crude palm oil has led Indonesia to become one of the countries that have a large number of palm fatty acid distillate (PFAD) in the world. As a source of fatty acid, PFAD has wide range of uses, including as a fat supplement in the ruminant feed when reacted with a calcium source such as calcium oxide (CaO). At the working temperature above PFAD’s melting point, those reactants form a homogeneous phase with the help of intensive stirring. By the presence of a small amount of water, the mixture will be saponified and become the calcium soap. This research studied how different particles sizes of CaO could influence the reaction conversions based on the acid value of the product. The CaO solid particles were sieved and separated into the different fraction of sizes (<177 μm, 177-320 μm, and 320-640 μm). Smaller particle resulted in a lower acid value which indicates a high conversion of free fatty acid and lower moisture content which is preferable for the product

Calcium soap from palm fatty acid distillate (PFAD) for ruminant feed: quality of calcium source

Calcium soap is potentially used as fat supplements for ruminants since it contains high concentration of fat and calcium that are useful for ruminants. The consumption of calcium soap may increase the yield and the fat content of milk, as well as increase the ruminant’s fertility. Calcium soap can be produced from palm fatty acid distillate (PFAD), which is a by-product of crude palm oil (CPO) refining process, and calcium oxide (CaO). In this study, the effect of CaO quality on the acid value of the product has been observed. It was found that the reaction with lower concentration of active calcium of CaO resulted in products with a higher acid value, which indicates a lower reaction conversion. Thus, the produced calcium soap requires further treatment in order to remove the unreacted calcium and free fatty acid. Washing with hexane followed by either vacuum or convection drying has been found to be able to reduce the acid value of the product significantly

Calcium soap from palm fatty acid distillate (PFAD) for ruminant feed: quality of calcium source

Calcium soap is potentially used as fat supplements for ruminants since it contains high concentration of fat and calcium that are useful for ruminants. The consumption of calcium soap may increase the yield and the fat content of milk, as well as increase the ruminant’s fertility. Calcium soap can be produced from palm fatty acid distillate (PFAD), which is a by-product of crude palm oil (CPO) refining process, and calcium oxide (CaO). In this study, the effect of CaO quality on the acid value of the product has been observed. It was found that the reaction with lower concentration of active calcium of CaO resulted in products with a higher acid value, which indicates a lower reaction conversion. Thus, the produced calcium soap requires further treatment in order to remove the unreacted calcium and free fatty acid. Washing with hexane followed by either vacuum or convection drying has been found to be able to reduce the acid value of the product significantly

Calcium soap from palm fatty acid distillate (PFAD) for ruminant feed: quality of calcium source

Calcium soap is potentially used as fat supplements for ruminants since it contains high concentration of fat and calcium that are useful for ruminants. The consumption of calcium soap may increase the yield and the fat content of milk, as well as increase the ruminant’s fertility. Calcium soap can be produced from palm fatty acid distillate (PFAD), which is a by-product of crude palm oil (CPO) refining process, and calcium oxide (CaO). In this study, the effect of CaO quality on the acid value of the product has been observed. It was found that the reaction with lower concentration of active calcium of CaO resulted in products with a higher acid value, which indicates a lower reaction conversion. Thus, the produced calcium soap requires further treatment in order to remove the unreacted calcium and free fatty acid. Washing with hexane followed by either vacuum or convection drying has been found to be able to reduce the acid value of the product significantly