Biotechnology for Biofuels and Bioproducts

Table 4 Assignments of ¹³C-¹H cross-signals in HSQC spectra of hemicellulosic fractions isolated by sequential alkaline extractions from the delignified ryegrass

From: Enzymatic response of ryegrass cellulose and hemicellulose valorization introduced by sequential alkaline extractions

Glycosyl	Assignments (ppm)
Glycosyl		1	2	3	4	5eq^d	5ax^e	OCH₃
X^a	¹³C	102.4	73.5	75.0	76.0	63.2	63.2
X^a	¹H	4.35	3.17	3.32	3.60	3.93	3.21
U^b	¹³C		71.2	73.8				59.6
U^b	¹H		3.40	3.61				3.31
A^c	¹³C	109.6	80.2	78.3	86.5	61.7	61.7
A^c	¹H	5.25	3.91	3.63	4.05	3.73	3.55
Gal	¹³C		69.5
Gal	¹H		3.85

^aX, (1 → 4)-β-d-Xylp
^bU, 4-O-methyl-α-d-GlcpA
^cA, α-ʟ-Araf residues
^deq, equatorial
^eax, axial

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