a. ChlorophyllThe plastid pigments in relation to the physiological age of the leafaccording to stalk position was examined. Concentration of chlorophyllwas approximately the same at all stalk positions in a virescent line. Influe-cured tobacco,chlorophyl...[繼續(xù)閱讀]

    The objectives of flue - curing tobacco are to maintain and enhancethe potential quality embodied in the harvested leaf and to provide an environment conducive to the transformation of that leaf into a high qualitycured tobacco product. This is achieved t...[繼續(xù)閱讀]

    Freshly cured tobacco leaf is unfit for use because of its pungent andirritating smoke. By the process of fermentation and aging,the leaf delivers mild and aromatic smoke. Aging is generally applied to cigarettetobacco,i. e.,a mild state of fermentation,u...[繼續(xù)閱讀]

    Tobacco quality represents a balance of essential properties in aproduct which meets the preference of a special group of consumers at agiven time and location. Quality therefore may be considered as desirability or usability. Many essential chemical and ...[繼續(xù)閱讀]

    All variables in tobacco plant,leaf,and smoke are interrelated.No step of tobacco operation from seed germination to smoke delivery canbe isolated,because they relate to the usability of final products. “Usability” is considered as consumer acceptability ...[繼續(xù)閱讀]

    Certain chemical index,for example,petroleum ether extract(PEE),is often used as an indicator of leaf desirability,although theexact components of this fraction are not completely defined,nor are itscombustion products. A few studies are listed herein ill...[繼續(xù)閱讀]

    The terms “flavor” and “aroma” of tobacco are used rather loosely. Generally,flavor refers to the blend of taste and smell sensationsevoked by a substance in the mouth; aroma refers to the distinctivepleasing odor or smell derived from either leaf tobacco...[繼續(xù)閱讀]

    The range of nitrate nitrogen content in various types of leaf tobaccois shown in Table 21.1. The nitrate nitrogen content is significantly correlated to the amount of fertilizer nitrogen added to the field and to thepercentage of total nitrogen in the le...[繼續(xù)閱讀]

    One subject of interest is “grey” flue - cured tobacco. Despitemany studies from different countries,there is no conclusive,unifiedanswer. Among the factors suspected to be associated with “grey” tobacco,are: soil pH,organic matter,maturity at harvesting,...[繼續(xù)閱讀]

    The characteristics of cigarette smoke are functions of the physicaland chemical properties of the leaf tobacco that makes up the cigarette.Smoke constituents,therefore,may be modified by changing leaf characteristics. Production techniques have demonstra...[繼續(xù)閱讀]