ARTICLE IN PRESS
JOURNAL OF
FOOD COMPOSITION
AND ANALYSIS
Journal of Food Composition and Analysis 16 (2003) 677–685
www.elsevier.com/locate/jfca
Original Article
Total, insoluble and soluble dietary fiber contents
of Indian fruits
Punna Ramulu*, Paruchuri Udayasekhara Rao
Food Chemistry Division, National Institute of Nutrition, Indian Council of Medical Research, Jamai-Osmania (P.O),
Hyderabad 500 007, India
Received 30 September 2002; received in revised form 21 February 2003; accepted 13 April 2003
Abstract
This work provides new data on total (TDF), insoluble (IDF) and soluble (SDF) dietary fiber contents of
Indian fruits, which play an important role in human nutrition. Twenty-five common fruits and nine mango
varieties were analyzed for their TDF, IDF and SDF contents by enzymatic and gravimetric method of
AOAC. Among the fruits, the TDF and IDF contents ranged between 0.6 and 0.3 g% in watermelon and
10.9 and 9.1 g% in sapota, respectively. The SDF content ranged from 0.3 g% in watermelon to 2.4 g% in
fig. The SDF as percentage of TDF was low in pear (7.0%) and high in sweet lime (51.8%), but in general,
the majority of the fruits had 30%. In mango varieties the TDF and IDF contents were low in
panchadarakalasa (1.3 and 0.5 g%) and high in banganapalli (3.0 and 1.5 g%), respectively. The SDF
content was low in dashehari (0.7 g%) and high in eruman (1.6 g%). The SDF as % TDF ranged between
46.9% in dashehari and 61.5% in panchadarakalasa, but most of the mango varieties had around 50% of
their TDF as SDF. Results indicate that fruits such as fig, mango, orange, papaya and sweet lime are rich
sources of SDF, the component of TDF associated with a number of health benefits. The TDF contents of
fruits analyzed in the present study were higher than their crude fiber content.
r 2003 Elsevier Ltd. All rights reserved.
Keywords: Fruits; Mango varieties; Crude fiber; Total dietary fiber; Insoluble dietary fiber; Soluble dietary fiber
1. Introduction
Dietary fiber (DF) plays an important role in decreasing the risks of many disorders such as
constipation, diabetes, cardiovascular diseases (CVD), diverticulosis and obesity (Spiller, 2001).
*Corresponding author. Tel.: +91-40-7008921; fax: +91-40-7019074.
E-mail address: p [email protected] (P. Ramulu).
0889-1575/$ - see front matter r 2003 Elsevier Ltd. All rights reserved.
doi:10.1016/S0889-1575(03)00095-4
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Plant foods are the only sources of DF. All the fractions (cellulose, lignin, hemicellulose,
pectins, gums and mucilages) of DF are the major constituents of plant cell wall (Selvendran,
1984; Selvendran & MacDougall, 1995). Dietary fiber is subdivided into Insoluble (IDF)
and soluble (SDF) dietary fiber depending on their solubility in water. However, the DF can
be grouped into two major types (a) soluble/viscous/fermentable and (b) insoluble/nonviscous/slowly fermentable (Roberfroid, 1993). Recently, FAO/WHO discussion document
on carbohydrates recommended dropping the terms ‘‘soluble’’ and ‘‘insoluble’’ fiber (FAO,
1998). The physiological effects of total dietary fiber (TDF), in the forms of insoluble and
soluble fractions of foods, have a significant role in human nutrition (Schweitzer & Edwards,
1992).
Indian diets predominantly consist of a variety of plant foods such as cereals, pulses,
green leafy vegetables (GLV), roots, tubers, other vegetables, fruits, oil seeds, spices and
condiments. Fruits are consumed in various forms like fresh, dried, frozen or canned (Marlett,
1992). The polysaccharides comprising a major part of DF in fruits and vegetables are
beneficial to healthy human volunteers, since the consumption of fiber lowers plasma cholesterol
levels (Jenkins, Kendall, & Ransom, 1998). Gillman et al. (1995) reported protective effect of
fruits and vegetables against the development of stroke in men. Addition of fruits and
vegetables to the regular diet of infarcted survivors resulted in a decreased mortality and
subsequent infarctions (Singh, Niaz, Ghosh, Singh, & Rastogi, 1993). Therefore, the dietary fiber
may play a major role in determining the health and disease conditions of different population
groups.
The data on DF content and its components in fruits are not available in India. The
dietary reference value (DRV) for the DF has not been prescribed so far, either in India
(Indian Council of Medical Research, 1998), or in most other countries. Some organizations
suggested 10 g DF/1000 kcal as an interim recommendation (Mori et al., 1996) and Food
and Nutrition Board (2002), Institute of Medicine, USA recommended approximately 14 g TF/
1000 Kcal. No systematic studies are available so far in this regard. Presently, the food
composition tables give crude fiber (CF) content but not DF content of foods in India
(Gopalan, Ramasastri, & Balasubramanian, 2000). Moreover, the methodology for the
determination of fiber content of foods has changed from time to time from a chemical
method (Van Soest & Wine, 1967) to chemical and gravimetric method (Southgate, 1969)
to an enzymatic and gravimetric method (Prosky, Asp, Schweitzer, DeVries, & Furda, 1988).
The methodology for the enzymatic and gravimetric determination of DF content of
foods simulates the human physiological digestive process and hence gives more accurate/
relevant values. Therefore, it is necessary to adopt a suitable method for the determination of TDF, IDF and SDF contents of foods, which mimics the human physiological
conditions.
Our earlier studies at National Institute of Nutrition for determining the TDF, IDF and
SDF content of cereals and pulses demonstrated that most of the cereals are a rich source
of IDF, except wheat, which is rich in both IDF and SDF. Pulses are good sources of IDF
as well as SDF (Ramulu & Udayasekhararao, 1997). Since a variety of health benefits have
been attributed to the consumption of fruits and as there are no data available on TDF, IDF and
SDF contents of most of the commonly consumed fruits in India, the present study has been
undertaken.
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2. Materials and methods
2.1. Collection of samples
Twenty-five different types of fruits (amla, apple, banana, cherry, custard apple, fresh dates,
fig, grape, guava, jackfruit, jambu, mango, muskmelon, orange, papaya, peach, pear, pineapple,
plum, pomegranate, sapota, strawberry, sweet lime, watermelon and zizyphus) were purchased
from local markets. Each variety of fruit was collected from four different places to assess
the variation in their TDF, IDF and SDF contents. Nine authentic mango varieties (banganapalli,
dashehari, eruman, neeligova, panchadarakalasa, peddarasaloo, rumani, totapuri, and
vikarabad mahamooda) were obtained from Acharya N.G. Ranga Agricultural University,
Rajendranagar, Hyderabad, India. Two pickle mango varieties (small and big) were also collected
from markets.
2.1.1. Samples preparation
Fresh fruits were cleaned with water and external moisture wiped out with a dry cloth. The
edible portion of the individual fruits was separated, weighed and homogenized thoroughly in a
mixer and a known weight of the sample was quantitatively transferred into 500 ml round bottom
flasks (glass) and lyophilized. Freeze-dried sample was extracted with diethyl ether to remove the
fat content. The total soluble free sugars present in the sample were extracted with 80% hot
ethanol. The sample was rinsed with acetone to remove any traces of moisture from the sample
and finally, dried in a hot air oven at 50 C for 1 h. The dried samples were then powdered in
cyclotech mill using 100-mesh size to get a fine powder.
2.2. Determination of TDF, IDF and SDF
Moisture and fat free samples were analyzed for their TDF, IDF and SDF contents by
enzymatic and gravimetric method of the Association of Official Analytical Chemists (AOAC)
(Prosky et al., 1988), using TDF-100 kit obtained from Sigma chemical company, USA. Along
with the test samples, blank and reference samples were also analyzed simultaneously in duplicate
for comparison. TDF, IDF and SDF contents of the various fruits analyzed were calculated and
expressed on fresh weight basis.
2.2.1. Data analyses
The data generated on TDF, IDF and SDF contents of the commonly consumed fruits have
been evaluated by parametric tests for statistical significance (Visveswara Rao, 1996).
3. Results and discussion
3.1. TDF, IDF and SDF contents of fruits
Table 1 gives the moisture, CF, TDF, IDF, SDF and SDF expressed as % of TDF, contents of
common Indian fruits. Among the fruits, the moisture content was low in dates (fresh) (18.8 g%),
680
Fruit common name (Botanical name)
Moisture
(g/100 g)
CF
(g/100 g)a
TDF
(g/100 g)
IDF
(g/100 g)
SDF
(g/100 g)
SDF
as % TDF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Watermelon (Citrullus vulgaris)
Muskmelon (Cucumis melo)
Orange (Citrus aurantium)
Grapes (Vitis vinifera)
Cherry (Prunus cerasus)
Peach (Amygdalis persica)
Banana (Musa paradisiaca)
Mango (Mangifera indica)
Strawberry (Fragaria vesca)
Papaya (Carica papaya)
Sweet lime (Citrus sinensis)
Pomegranate (Punica granatum)
Pineapple (Ananas comosus)
Plum (Prunus domestica)
Apple (Malus sylvestris)
Jackfruit (Artocarpus heterophyllus)
Jambu (Syzygium cumini)
Zizyphus (Zizyphus jujuba)
Pear (Prunus persica)
Fig (Ficus carica)
Custard apple (Anona squamosa)
Amla (Emblica officinalis)
Dates (fresh) (Phoenix dactylifera)
Guava (Psidium guajava)
Sapota (Achras sapota)
96.470.08
94.670.24
88.470.37
85.170.74
92.270.70
88.270.84
81.171.54
79.973.76
92.970.74
77.873.53
91.170.29
81.370.48
86.070.60
85.77.0.44
86.470.41
74.070.47
77.170.55
84.071.63
85.471.03
75.470.88
76.772.54
80.970.29
18.871.37
81.271.03
74.470.68
0.2
0.4
0.3
0.9
0.4
1.2
0.4
0.7
1.1
0.8
0.5
2.1
0.5
0.4
1.0
1.1
0.9
—
1.0
2.2
3.1
3.4
3.7
5.2
2.6
0.670.02
0.870.01
1.170.03
1.270.06
1.570.03
1.670.04
1.870.12
2.070.19
2.370.11
2.670.08
2.770.06
2.870.11
2.870.13
2.870.07
3.270.21
3.570.08
3.570.02
3.870.37
4.370.25
5.070.21
5.570.20
7.370.10
7.770.46
8.570.44
10.970.44
0.370.01
0.570.01
0.670.03
0.870.04
0.970.03
1.170.02
1.170.06
1.070.10
1.670.08
1.370.05
1.370.03
2.370.07
2.370.12
1.770.05
2.370.19
2.170.13
2.670.04
2.870.22
4.070.23
2.670.09
4.070.15
5.870.10
6.970.46
7.170.40
9.170.38
0.370.01
0.370.01
0.570.03
0.470.02
0.670.03
0.570.03
0.770.06
1.070.10
0.770.04
1.370.04
1.470.06
0.570.06
0.570.03
1.170.03
0.970.05
1.470.05
0.970.02
1.070.17
0.370.03
2.470.17
1.570.08
1.570.06
0.870.06
1.470.01
1.870.11
50.070.86
37.570.77
45.570.97
33.370.44
40.071.76
31.371.76
38.971.20
50.071.81
30.470.99
50.070.86
51.871.47
17.871.60
17.870.74
39.370.29
28.171.48
40.072.35
25.770.74
26.372.21
7.070.49
48.071.68
27.370.10
20.570.85
10.471.07
16.570.60
16.571.26
TDF: total dietary fiber; IDF: insoluble dietary fiber; SDF: soluble dietary fiber.
No. of samples: four in duplicate determinations for each fruit.
a
CF: crude fiber values are taken from ‘‘Nutritive Value of Indian Foods’’ (Gopalan et al., 2000).
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Table 1
Moisture, crude fiber, total, insoluble and soluble dietary fiber contents of fruits (mean7s.e.)
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681
and high in watermelon (96.4 g%). The TDF and IDF contents of the fruits ranged between 0.6
and 0.3 g% in watermelon and 10.9 and 9.1 g% in sapota, respectively. The SDF content ranged
from 0.3 g% in watermelon to 2.4 g% in fig. The SDF as % of TDF was low in pear (7.0%) and
high in sweet lime (51.8%). Interestingly, the majority of the fruits had 30% of TDF as SDF. The
SDF expressed as % of TDF was around 50% in fig, mango, orange, papaya, sweet lime and
watermelon indicating that these fruits are rich in SDF.
Foods high in SDF content, such as fenugreek (Al-Habori & Raman, 1998), guar gum, oat and
psyllium are known for their hypoglycemic and hypocholesterolemic effects in experimental
animals as well as in humans (Lairon, 1996). Though fruit consumption in India is meager in
quantitative terms, it is a good source of SDF. Thus, the inclusion of fruits rich in SDF content in
the regular diet may be beneficial.
Both American Dietetic Association (ADA) and Dietary Guidelines for Americans
recommended the inclusion of a variety of grains, vegetables and fruits for an active and healthy
life (Johnson & Kennedy, 2000). A position statement announced recently by the ADA mentions
that the public should consume adequate amounts of dietary fiber from a variety of plant foods
(Marlett, McBurney, & Slavin, 2002). The source of daily TDF intake through foods in diet in
developed countries is very low when compared to developing and underdeveloped countries and
therefore emphasis was laid on increasing the intake of TDF in developed countries (National
Research Council, 1989). The daily TDF intake from fruits, calculated from data based on the
national survey in Japan, was in the range of 0.53–2.50 g% per day per person (Nishimune et al.,
1993); this is insignificant compared to total daily TDF intake from diet. Results of the present
study will be useful to dietitians and to revise dietary guidelines in recommending fruits rich in
SDF to the Indian population.
3.2. Fiber content of fruits in different studies
Table 2 gives the fiber content of fruits in different studies. The TDF values for the fruits
obtained in the present study were higher than the CF values for the corresponding fruits reported
in the Nutritive Value of Indian Foods (Gopalan et al., 2000). This variation could be due to
differences in the methodology applied for the determination of fiber content in foods. The TDF
values of fruit banana (1.8 g%), cherry (1.5 g%), mango (2.0 g%), peach (1.6 g%) and muskmelon
(0.8 g%) obtained in the present study were more or less similar to the DF values reported in
‘‘Food Composition and Nutrition Tables’’. However, for all other fruits, higher TDF values were
observed in the present study compared to those reported in ‘‘Food Composition and Nutrition
Tables’’ (Souci, Fachmann, & Krant, 2000) except for orange (1.1 g%) which showed a lower
value. The TDF values of some of the fruits analyzed in the present study were in general higher
than those reported by Chang, Lee, Lin, and Chen (1998), except for banana, papaya and
watermelon. It was also observed that there were lower TDF values for apple (3.2 g%), orange
(1.1 g%), peach (1.6 g%) and muskmelon (0.8 g%) than the corresponding values reported by
Chang et al. (1998). The TDF values of seven fruits (apple, guava, pear, plum, pineapple,
strawberry and muskmelon) in the present study were higher than those reported by Holland et al.
(1993). It was also observed that there were lower TDF values for mango (2.0 g%), orange
(1.1 g%), peach (1.6 g%) and watermelon (0.6 g%) than those reported for the corresponding
fruits by Holland et al. (1993). The observed variations in TDF contents of Indian fruits in the
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Table 2
Fiber content of fruits in different studies
Fruit
Apple
Banana
Cherry
Guava
Mango
Orange
Papaya
Pear
Peach
Plum
Pine apple
Strawberry
Watermelon
Muskmelon
Crude fiber
(NVIF)
(g/100 g)a
Total dietary fiber (g/100 g)
FCNT
(2000)b
Chang et al.
(1998)
McCance &
Widdowson
(Southgate)c
Present study
1.0
0.4
0.4
5.2
0.7
0.3
0.8
1.0
1.2
0.4
0.5
1.0
0.2
0.4
2.0
1.8
1.3
5.2
1.7
1.6
1.9
3.3
1.9
1.6
1.0
1.6
0.2
0.7
4.2
2.0
0.7
5.3
1.4
5.4
2.7
3.2
3.9
1.7
1.6
1.7
0.8
1.4
2.0
2.0
1.5
4.7
2.9
1.8
2.3
2.1
2.3
2.3
1.3
2.0
0.9
0.3
3.2
1.8
1.5
8.5
2.0
1.1
2.5
4.3
1.6
2.8
2.8
2.3
0.6
0.8
a
NVIF: Nutritive Value of Indian Foods (Gopalan et al., 2000).
FCNT: Food Composition and Nutrition Tables, CRC Press, Germany, 2000.
c
McCance and Widdowson’s ‘‘The Composition of Foods’’, 1993.
b
present study and those reported by earlier studies could be attributed to the differences in genetic
make up and agronomic and climatic conditions of cultivation.
3.3. Dietary fiber content of mango varieties
Table 3 gives the moisture, TDF, IDF, SDF and SDF as % of TDF, of mango varieties. The
moisture content of mango varieties ranged from 74.1 g% in banganapalli to 90.3 g% in
peddarasaloo, while in pickle mangoes, it was around 83.9 g%. Among the mango varieties, the
TDF and IDF contents were low in panchadarakalasa (1.3 and 0.5 g%) and high in banganapalli
(3.0 and 1.5 g%). The SDF was low in dashehari (0.7 g%) and high in eruman (1.6 g%). The SDF
as % TDF ranged between 46.7% in dashehari and 61.5% in panchadarakalasa, but most of the
mango varieties had around 50% of their TDF as SDF. Gourgue, Champ, Lozano, and DelortLaval (1992) have shown that the mango pulp has IDF and SDF in the ratio of one and made
similar observations. Among the two pickle varieties of mango analyzed, the moisture contents
were 81.2 and 86.6 g%, respectively. The TDF, IDF and SDF contents were 2.3, 1.0 and 1.3 g% in
big pickle mango and 3.8, 1.8 and 2.0 g% in small pickle mango, respectively. SDF as percent of
TDF was in the range of 52.6–56.5%.
The results of the present investigation on TDF, IDF and SDF contents of commonly
consumed Indian fruits indicate that the TDF values are much higher than the CF values of
corresponding fruits (Table 1). The CF contents of fruits reported in Nutritive Value of Indian
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683
Table 3
Moisture, total, insoluble and soluble dietary fiber contents of mango (Mangifera indica) varieties (mean7s.e.)
S. No
Fruit
Moisture
(g/100 g)
TDF
(g/100 g)
IDF
(g/100 g)
SDF
(g/100 g)
SDF as %
of TDF
1
2
3
4
5
6
7
8
9
10
11
Panchadara Kalasa
Dashehari
Vikarabad Mahamooda
Rumani
Totapuri
Peddarasaloo
Neeligova
Eruman
Banganapalli
Pickle mango (big)
Pickle mango (small)
83.670.86
80.370.37
84.570.22
82.270.24
86.270.38
90.370.37
85.871.26
81.970.86
74.170.59
86.670.78
81.270.67
1.370.04
1.570.06
1.670.02
1.770.01
2.070.06
2.070.04
2.370.14
2.970.35
3.070.17
2.370.11
3.870.12
0.570.01
0.870.06
0.870.02
0.870.01
1.070.02
0.870.02
1.270.08
1.370.10
1.570.08
1.070.06
1.870.07
0.870.04
0.770.03
0.870.02
0.970.01
1.070.05
1.270.03
1.170.08
1.670.25
1.570.12
1.370.05
2.070.09
61.571.25
46.772.76
50.070.62
52.970.01
50.071.03
60.070.79
47.871.19
55.271.96
50.071.32
56.570.84
52.671.44
TDF: total dietary fiber; IDF: insoluble dietary fiber; SDF: soluble dietary fiber.
No. of samples: four determinations in duplicate for each mango variety.
Foods (Gopalan et al., 2000), were estimated by chemical methods, whereas the TDF values in the
present study were assessed by enzymatic and gravimetric methods (Prosky et al., 1988). The
differences in fiber contents of fruits may be due to the differences in methodology used for the
determination of fiber. The unavailable carbohydrate values of banana (2.5 g%) and mango
(2.3 g%) estimated by Kamath and Belavady (1980) with the Southgate method were higher than
the corresponding TDF values for banana (1.8 g%) and mango (2.0 g%) obtained in the present
study by enzymatic and gravimetric methods (Prosky et al., 1988). The discrepancies observed
between the results of the present study and those reported by Chang et al. (1998) for the
corresponding fruits could be due to varietal or location differences and agro-climatic or soil
condition differences.
From the results observed in this study, it is evident that fruits such as fig, mango, orange, papaya
and sweet lime are rich sources of SDF, the component of TDF associated with a number of health
benefits. Among the mango varieties, banganapalli and eruman appear to be better sources of SDF
than others. The data generated in the present study on TDF, IDF and SDF contents of different
fruits will be useful in selecting appropriate fruits rich in SDF for incorporation into the Indian diets
to promote better health. Also they can be included in the food composition tables, which in turn
will help dietitians to plan SDF rich diets for diabetic and hyperlipidemic subjects. These data will
also be useful to the National Nutrition Monitoring Bureau (NNMB) for computing the DF intake
of different population groups in India. In addition they shall also help in computing the correct
values for available carbohydrates from these different fruits.
Acknowledgements
The authors wish to thank Dr. Kamala Krishnaswamy, Former Director, National Institute of
Nutrition (NIN), Indian Council of Medical Research, Hyderabad, India for her valuable
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suggestions, interest and encouragement in carrying out the present study. We wish to thank
Dr. B. Sivakumar, Officer-in-Charge, NIN, for his keen interest in this study.
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