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保压时间对白茶饼物理特性和感官品质及化学成分的影响

Effect of Compression Time on Physical Properties, Sensory Quality, and Chemical Composition of White Tea Bricks

  • 摘要: 为了解不同保压时间对白茶饼的感官品质及理化特性的影响,选用福鼎大白茶白牡丹和贡眉为供试材料,在固定压力30 t条件下,研究不同保压时间(10、20、30、40、50 s)处理对白茶饼的感官品质、物理特性和化学成分含量的影响。感官审评表明,两种原料白茶饼以保压时间30 s处理的品质差,而50 s处理的品质最优。理化数据分析表明,随着保压时间的增加,白茶饼硬度增加,而茶多酚和游离氨基酸氨基酸总量均呈升高态势,儿茶素组分(尤其是酯型儿茶素)含量则先升高后降低,从而使得保压时间50 s处理制作的白茶饼口感醇爽。

     

    Abstract:   Effects of the compression time applied to form a tea brick on the physicalproperties, sensory quality, and chemical composition of resulting white tea productswere studied. The Fudingdabaicha white peony and Gongmei teas were compressedinto bricks with a constant pressure of 30 t for 10, 20, 30, 40, or 50 s.Chemical analysis and sensory evaluation were conducted subsequently to providemeasurements for comparison and evaluation. The sensory quality of brewed teasof the tea bricks made under the compression that lasted less than 30 s was notdesirable. It was much superior when the pressure was placed on for 50 s. Witha prolonging compression, the blocks formed became harder and the contents oftotal tea polyphenols and free amino acids greater, while catechins, especially,ester catechins, rose but declined at 50 s. The steeped white tea bricks formedunder a longer compression time had a pleasant taste.

     

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