Nutritional composition and processed products of Quince...
Transcript of Nutritional composition and processed products of Quince...
Indian Journal of Natural Products and Resources
Vol. 2(3), September 2011, pp. 354-357
Nutritional composition and processed products of
Quince (Cydonia oblonga Mill.)
Rakesh Sharma1*, V K Joshi
1 and J C Rana
2
1Department of Food Science and Technology, Dr Y S Parmar University of Horticulture and Forestry, Nauni, Solan 173 230
Himachal Pradesh, India 2NBPGR Regional Station, Phagli, Shimla-171 004, Himachal Pradesh
Received 28 September 2010; Accepted 4 May 2011
The present investigation was undertaken with the aim to develop processed products from Cydonia oblonga Mill.
commonly known as Quince. It is the cheaper, highly nutritious underutilized fruit of sub-Himalayan regions which has
great economic and medicinal potential. The fruits are known to be hypoglycaemic, anti-inflammatory and anticarcinogenic
and act as a tonic for heart and brain. Fruits were analyzed for various physico-chemical properties. Analysis of the edible
part of the fruit gave: moisture, 84.6; total soluble solids, 14.2; total sugars, 9.0; pectin, 1.8; crude fibre, 1.6; and tannins
0.8%, respectively and contains 16.8 mg/100 g ascorbic acid. Quince is also a good source of minerals like potassium,
phosphorous and calcium. Processed products like jam and jelly were prepared and assessed for their nutritive quality and
acceptability. The total soluble solids of jam and jelly were recorded to be 70° and 66° Brix. It was found that quince jelly
contained more amount of ascorbic acid (12.60 mg/100 g) and pectin (1.32%) compared to jam. Organoleptic evaluation of
processed products showed good acceptability. Overall, quince jelly was found best on the basis of nutritive and
organoleptic qualities.
Keywords: Cydonia oblonga, Jam, Jelly, Quince, Processed products, Value addition.
IPC code; Int. cl. (2011.01) A61K 36/00, A23L 1/064
Introduction
Quince (Cydonia oblonga Mill.) is a shrub or a
small tree, native of Iran and Turkey, almost
naturalized in semi-cultivated lands in a scattered
manner across the sub-Himalayan tract at an altitude
of 1000-2000 m above msl1,2
. It is also called as
bihi dana or bamchount in Kashmir valley3. It is
resistant to woolly aphid and nematodes but
susceptible to fire blight and excess lime and cold.
The fruits, which are pear or apple-shaped, are golden
yellow in colour, juicy, fragrant, sub-acid or sour in
taste and contain a large number of plano-convex,
mucilage-coated seeds, closely packed in two vertical
rows4,5
. The peel is covered with abundant hairs,
which disappears with fruit ripening. Due to
astringent taste, fruits are usually eaten after cooking
or baking, or are made into preserves and jellies by
the local people of North-East Himalayan region6.
Quince is a climacteric fruit and requires a proper
ripening process at 20°C for processing purposes.
These are harvested at a time similar to most winter
pear cultivars i.e. during October-November. There is
no specific maturity index for quince fruit; however
harvest begins when fruit change their ground colour
from deep-green to a lighter-green7.
Quince has aromatic, astringent and cooling
properties and acts as a tonic for heart and brain. The
mucilage is used as an external application for scalds
and ulcers. The dried pits of its fruit are used as
remedy for soreness of throat and relieving cough. In
the indigenous systems of medicine, the quince is
used in treating diarrhoea, dysentery and
constipation6,8,9
. Quince juice proves to be very
effective against diabetes and urinary problems. It
also helps against respiratory disorders like cough,
cold and asthma. Quince is used to make jam, jelly
and puddings in many parts of the world5,8,10,11
.
Therefore, efforts were made to study the
nutritional composition of quince fruit grown in hilly
region of Himachal Pradesh and its suitability to
prepare various processed products.
___________
*Correspondent author:
E-mail: [email protected], [email protected]
Phone: +91-9418061369 (Mob.)
SHARMA et al.: NUTRITIONAL COMPOSITION AND PROCESSED PRODUCTS OF QUINCE
355
Materials and Methods The fruits of Cydonia (Plate 1) were collected from
National Bureau of Plant Genetic Resources Regional
Station, Shimla and brought to the Department of
Food Science and Technology, Dr Y S Parmar
University of Horticulture and Forestry, Nauni, Solan
to study the nutritional composition and processed
products of quince. Some of the parameters were
estimated at the Regional Station, National Bureau of
Plant Genetic Resources, Shimla.
Physico-chemical and nutritional parameters of fruit
The physical parameters analyzed were weight
(mean of 10 fruits), diameter (measured with the help
of Vernier caliper), edible portion (%), peel (%) and
seed (%). For chemical and nutritional parameters, the
edible portion (pulp) of fruit was analyzed for
attributes like moisture, total soluble solids (TSS),
titratable acidity, sugars, ascorbic acid, pectin, crude
fibre, tannins and minerals by using standard
analytical procedures12-14
.
Preparation and evaluation of processed products
The pulp from the fruit was extracted by hot break
method. The extracted pulp was used for preparation
of processed products i.e. jam and jellies. The
products were prepared according to the standard
methods. For the preparation of Cydonia jam, sound
fruits are sorted, washed in running water, peeled,
cored, sliced and heated with water (@10%) to extract
the pulp. Fruit pulp is then cooked with requisite
quantity of sugar to a thick consistency until the total
soluble solids (TSS) reached to 68%. However, in
case of jelly, sliced fruits are boiled with water to
extract the pectin-fruit extract. Sugar is added after
performing pectin test to calculate the quantity of
sugar required. Cooking is done until total soluble
solids reached to 65%. According to FPO
specifications, 1 kg fruit pulp, 750 g sugar and 2.0 g
citric acid were used to prepare the jam, whereas, in
case of jelly, 1 kg pectin extract, 800 g sugar and
2.0 g citric acid were used. Near to the end point,
permitted colors and requisite quantities of citric acid
and flavourings are added. The product is then filled
hot in pre-sterilized jars up to the brim. On cooling
waxing is done and lid is closed.
The products were also evaluated for various
physico-chemical and sensory quality characteristics.
Physico-chemical parameters of jam and jelly like
TSS, titratable acidity, sugars, ascorbic acid, pectin
and ash were estimated using standard analytical
methods12,13
. Sensory quality was got done by a panel
of 10 semi-trained judges on 9-point hedonic scale15
.
Triplicate determinations were made for each attribute
and average values of the parameters were reported.
Results and Discussion
Proximate composition of quince fruit
Quince is one of the most important underutilized
fruit species which gives fruits with high nutrient
value and positive influence on human health. It was
found that the fruit of quince consists of: pulp, 90.6;
peel, 4.4 and core with seeds, 5.0%, respectively.
Analysis of the edible part of the fruit is given in
Table 1. The juice contains malic acid (1.2%) and a
small quantity of tartaric acid. The fruit is also a good
source of ascorbic acid (16.8 mg/100 g) and minerals
like potassium, phosphorous and calcium which
depicted its nutritive value (Table 1). Chemical and organoleptic quality of processed products
(Jam and jelly)
Jam is a product made by boiling fruit pulp with
sufficient sugar to a reasonably thick consistency,
firm enough to hold the tissues in position. However,
jelly is a semi-solid product prepared by boiling clear,
strained pectin-containing fruit extract, free from
pulp, after addition of sugar and acids to a stage at
which a clear gel forms. According to Fruit Products
Order, 1955(Ref. 16)
, jam should contain at least 45 parts
of fruit pulp for every 55 parts of sugar and
68° B or % of total soluble solids; however jelly
should contain 65% of total soluble solids.
Plate 1 Quince fruits
INDIAN J NAT PROD RESOUR, SEPTEMBER 2011
356
The processed products of quince were analyzed
for their chemical and organoleptic quality and the
data is presented in Table 2. The total soluble solids
of jam and jelly were recorded to be 70° and 66° B,
respectively. Quince jelly contained more titratable
acidity (0.80% as malic acid) as compared to 0.72%
in jam. The total sugar and reducing sugar contents of
jam and jelly were recorded to 46.10 and 28.20%, and
42.60 and 22.40%, respectively. It was found that
quince jelly contained more amount of ascorbic acid
(12.60 mg/100g) and pectin (1.32%) compared to
jam. Further, both the products of quince (jam and
jelly) contained almost equal amounts of ash content,
which is a measure of the total amount of minerals
like calcium, potassium, phosphorous, etc. Further,
the data presented in Table 2 revealed that both the
products were rated acceptable by the panelists,
however quince jelly was adjudged best for colour,
taste, flavour and overall acceptability.
Conclusion Conclusively, it emerges that quince is highly
nutritious underutilized fruit crop which can play a
great role in human health. The analyzed nutrient
content showed that quince jam and jelly are rich
source of malic acid and ascorbic acid, beside other
phytochemicals. Hence, considering nutritive value as
well organoleptic qualities of the prepared products
i.e. jam and jelly, these can be commercialized and
popularized for human consumption.
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Table 1 Proximate composition of quince fruit
Parameters Values (Mean ± SD#)
Fruit weight (g) 386.0 ± 5.0
Diameter (cm) 8.5 ± 1.2
Pulp/edible portion (%) 90.6 ± 2.4
Peel (%) 4.4 ± 0.8
Seed (%) 5.0 ± 0.8
Moisture (%) 84.6 ± 2.2
Total soluble solids (o B) 14.2 ± 0.5
Titratable acidity (as % malic acid) 1.2 ± 0.8
Reducing sugars (%) 5.0 ± 1.0
Total sugars (%) 9.0 ± 1.0
Tannins (%) 0.8 ± 0.02
Pectin (%) 1.8 ± 0.1
Vitamin C (mg/100 g) 16.8 ± 0.8
Crude fibre (%) 1.6 ± 0.05
Minerals (mg/100 g):
Potassium 248.0 ± 0.02
Phosphorous 26.0 ± 0.04
Sodium 8.0± 0.03
Calcium 18.0± 0.02
# SD= Standard deviation
Table 2 Chemical and organoleptic quality of quince
jam and jelly
Parameters Jam Jelly
Chemical
TSS (oB) 70.0 66.0
Titratable acidity (%MA) 0.72 0.80
Ascorbic acid (mg/ 100 g) 11.20 12.60
Total Sugars (%) 46.10 42.60
Reducing Sugars (%) 28.20 22.40
Pectin (%) 1.20 1.32
Ash (%) 2.80 2.78
Organoleptic*
Colour 7.40 7.60
Flavour 7. 00 7.36
Body 7.20 7.40
Taste 6.86 7.20
Overall acceptability 7.00 7.40
*Organoleptic score for various parameters on 9-point hedonic
scale
SHARMA et al.: NUTRITIONAL COMPOSITION AND PROCESSED PRODUCTS OF QUINCE
357
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