Study On Applicability Of New Apple Cutivar ‘Meihong’ To Prepare Low Sugar And High Flavonoid Candied Apple

China is the world’s largest apple production and consumer,‘Fuji’apple accounted for more than 70%,cultivar structure is simple,and to fresh food,lack of high quality processing new cultivars.In this study,a new cultivar of high-flavonoid apple selected by the research group was used as the test material to explore its applicability as a special variety for processing.The processing technology of candied fruit was optimized in order to preserve and make full use of flavonoids and other nutritive health care components.Through the quality evaluation of sensory and nutritional components,it is found that high-flavonoid apple is a new high-quality processed apple variety suitable for producing low-sugar high-flavonoid candied Apple,which fills the gap of pure natural red pulp candied Apple at home and abroad,and will provide scientific theoretical basis and technical support for the promotion and application of new varieties and the extension of industrial chain.The main research results and conclusions are as follows:1.The processing suitability of Meihong apples was studied by measuring the appearance,taste and nutrition of Meihong apples.Compared with Fuji apple,it is red flesh,hard fruit and good appearance and high in sugar and acid,with high acidity in taste and high content of flavonoid anthocyanins.It is suitable for processing into candied apples.2.The color texture characteristics of nutrient rehydration rate and water content of candied apples with low sugar content and high flavonoid content obtained by ultrasonic sugar infiltration microwave sugar vacuum sugar infiltration and sugar boiling sugar infiltration were compared.It was found that the nutrient retention rate of vacuum osmotic sugar was higher than that of other three osmotic methods.The content of flavonoids in candied fruit was as high as 8.272mg/g.It is more than 2 times of ultrasonic sugar,more than4 times of microwave sugar and sugar boiling sugar more than 8 times.L₉（3⁴）orthogonal test was carried out on the sugar infiltration time,sugar temperature and sucrose concentration of vacuum sugar infiltration to determine the best sugar infiltration process of candied fruit.3.The effects of color protection,hardening,sugar infiltration and drying on the quality of candied apple with low sugar and high flavonoids were studied.On the basis of preserving flavonoids and other nutrition and health components to the greatest extent,the processing technology of candied apples with low sugar and high flavonoids was optimized.coil altitude timberlands:Vc concentration of 1%,soaking time of 30min;.5%calcium chloride and 1.0%sodium chloride composite treatment,hardening time of 4h;vacuum sugar infiltration time 90min,sugar infiltration temperature 40℃,sucrose concentration 25%.After the vacuum is removed,continue to ooze sugar at room temperature for 12h;at the vacuum of 0.09 MPa,the temperature was 70℃,,baking 5h.The candied apples with low sugar and high flavonoids were the most nutritious.After vacuum packing,it can be stored under 12 conditions for 90days.4.The sensory quality and nutritional composition of low-sugar and high-flavonoid candied apple and low-sugar Fuji candied apple were analyzed.Low-sugar high-flavonoid candied apple has a rosy appearance,sweet and sour taste,compared with low-sugar Fuji candied apple more crystal clear,better sensory quality.The flavonoid content was more than3 times that of candied Fuji apples and about 7 times that of fresh samples.The contents of total phenolic anthocyanins and other nutrients were significantly higher than the fresh samples of Fuji candied apple and high-flavonoid appleThe above research results show that Meihong apple is a high-quality new variety suitable for processing candied fruit,which will fill the market gap of pure natural red pure candied apple at home and abroad,and provide theoretical basis and technical support for the promotion and application of high flavonoids apple and the extension of industrial chain,and has a good market prospect.