Bioactive Substances, Heavy Metals, and Antioxidant Activity in Whole Fruit, Peel, and Pulp of Citrus Fruits

Table 1

Content of dietary fibre and sugar (g/100 g) in citrus pulp (F), peel (P), and whole fruits (W).

Fruit/index	Part	Orange	Pomelo	Mandarin	Lemon	Key lime	Red grapefruit	Green grapefruit	White grapefruit
Glucose	F	^b	^c	^d	^ab	^a	^a	^c	^c
	P	^a	^d	^b	^c	^c	^d	^c	^c
	W	^a	^b	^b	^b	^ab	^b	^b	^b
Fructose	F	^a	^c	^c	^d	^d	^c	^b	^c
	P	^a	^e	^b	^f	^f	^e	^d	^c
	W	^a	^b	^b	^c	^c	^b	^b	^b
Sucrose	F	^d	^a	^f	^g	^e	^b	^b	^c
	P	^c	^a	^b	^f	^de	^d	^de	^e
	W	^c	^a	^d	^e	^f	^b	^b	^c
Dietary fibre	F	^b	^a	^c	^b	^b	^a	^a	6^a
	P	^a	^bc	^b	^a	^a	^c	^c	^d
	W	^c	^b	^d	^d	^e	^a	^c	^b
Statistical analysis
F^1vs. P
Glucose		<0.001	<0.001	<0.001	<0.001	<0.001	0.048	<0.001	<0.001
Fructose		<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
Sucrose		<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
Dietary fibre		<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
F^2vs. W
Glucose		0.146	0.022	0.059	0.033	0.041	0.034	0.014	<0.001
Fructose		0.002	<0.001	0.002	<0.001	<0.001	<0.001	<0.001	<0.001
Sucrose		<0.001	<0.001	0.022	0.872	0.326	0.003	0.001	<0.001
Dietary fibre		<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001

^a,b,c,d,e,fValues in rows with different letters are significantly different at : F rows—superscript letters indicate statistically significant differences in fibre and sugar content in the pulp (F) between citrus cultivars; P rows—superscript letters indicate statistically significant differences in fibre and sugar content in the peel (P) between citrus cultivars. W rows—superscript letters indicate statistically significant differences in fibre and sugar content in the whole fruit (W) between citrus cultivars. ¹F vs.—level of significance of differences between pulp (F) and peel (P) of individual citrus cultivars. ²F vs.—level of significance of differences between pulp (F) and whole fruit (W) of individual citrus cultivars.