For the fresh fruits, the most abundant protein amino
acids are Glx and Leu (20–19 mol%, each) and Asx
(17–13 mol%) (Fig. 2b). Also in relevant amount occur Ile
(10–7 mol%), Ala (8–7 mol%) and Val (7 mol%). Asx was
reported by Pilipenko et al. [7] as the predominant amino
acid in Pyrus communis L. fruits of Beurre´ variety
(35 mol%), showing that S. Bartolomeu pears present lower
relative amounts, although similar amounts are observed
when expressed in mg g-1. All amino acids found as constituents
of S. Bartolomeu pears have been also found in
Beurre´ variety. The exception is Hyp, not found in amounts
to be detected in S. Bartolomeu pears. Hyp is an amino acid
characteristic of extensins and arabinogalactan-rich glycoproteins.
Pyrus communis L. arabinogalactan-rich glycoproteins
from suspension cultures are composed mainly by
Glx (16 mol%) [28]. In Chinese species, reporting eight
pear varieties, Chen et al. [8] showed large variations in the
amino acid profile for the different pear varieties. Anyway,
Asn accounted for near 20% of total amino acids. In these
pears, Ser is the main constituent, although not always,
which is not the case of Pyrus communis L., where no Ser
was found.
For the fresh fruits, the most abundant protein aminoacids are Glx and Leu (20–19 mol%, each) and Asx(17–13 mol%) (Fig. 2b). Also in relevant amount occur Ile(10–7 mol%), Ala (8–7 mol%) and Val (7 mol%). Asx wasreported by Pilipenko et al. [7] as the predominant aminoacid in Pyrus communis L. fruits of Beurre´ variety(35 mol%), showing that S. Bartolomeu pears present lowerrelative amounts, although similar amounts are observedwhen expressed in mg g-1. All amino acids found as constituentsof S. Bartolomeu pears have been also found inBeurre´ variety. The exception is Hyp, not found in amountsto be detected in S. Bartolomeu pears. Hyp is an amino acidcharacteristic of extensins and arabinogalactan-rich glycoproteins.Pyrus communis L. arabinogalactan-rich glycoproteinsfrom suspension cultures are composed mainly byGlx (16 mol%) [28]. In Chinese species, reporting eightpear varieties, Chen et al. [8] showed large variations in theamino acid profile for the different pear varieties. Anyway,Asn accounted for near 20% of total amino acids. In thesepears, Ser is the main constituent, although not always,which is not the case of Pyrus communis L., where no Serwas found.
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For the fresh fruits, the most abundant protein amino
acids are Glx and Leu (20–19 mol%, each) and Asx
(17–13 mol%) (Fig. 2b). Also in relevant amount occur Ile
(10–7 mol%), Ala (8–7 mol%) and Val (7 mol%). Asx was
reported by Pilipenko et al. [7] as the predominant amino
acid in Pyrus communis L. fruits of Beurre´ variety
(35 mol%), showing that S. Bartolomeu pears present lower
relative amounts, although similar amounts are observed
when expressed in mg g-1. All amino acids found as constituents
of S. Bartolomeu pears have been also found in
Beurre´ variety. The exception is Hyp, not found in amounts
to be detected in S. Bartolomeu pears. Hyp is an amino acid
characteristic of extensins and arabinogalactan-rich glycoproteins.
Pyrus communis L. arabinogalactan-rich glycoproteins
from suspension cultures are composed mainly by
Glx (16 mol%) [28]. In Chinese species, reporting eight
pear varieties, Chen et al. [8] showed large variations in the
amino acid profile for the different pear varieties. Anyway,
Asn accounted for near 20% of total amino acids. In these
pears, Ser is the main constituent, although not always,
which is not the case of Pyrus communis L., where no Ser
was found.
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