Aveneu Park, Starling, Australia

IV. study have indicated that the untreated pomegranate

IV. RESULTS

The present research work entitled “Standardization of
pre and postharvest treatments to increase shelf life and postharvest quality
in pomegranate (Punica granatum L.)”
was carried out in the Department Postharvest Technology, College of Horticulture,
Bengaluru during the period 2015 to 2017. The effects of different pre and
post-harvest treatments on various physical, physiological and biochemical
parameters have been studied and explained here as follows:

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4.1 Effect of
pre-harvest treatments on postharvest quality of pomegranate

4.1.1. Total Soluble
Solids (TSS)

The results of this study have indicated that the
untreated pomegranate fruits presented a rapid increase significantly in the TSS
from the beginning of the storage period at ambient conditions as compared to
the treated fruits (Table 4.1.1). During storage the maximum TSS was recorded
at the end of the storage in S5(16.59°B) and the lowest was observed
on first day of storage S1(15.12°B). Irrespective of treatments
highest TSS was recorded in untreated fruits T12(16.43°B) which was on par with
T1(16.29°B)
and whereas the lowest TSS was recorded in T11(15.35°B) which was followed by
T5 and T9. The untreated (control) fruits attained maximum TSS value (16.2 °B)
on 16th day of storage (Table 4.1.1).

Also, the interaction between the treatment and
storage period was also significant as the maximum TSS (17.22 °B) was observed
on the 16th day of storage in T12S5  which was on par with T1S5(17.03°B)
and T7S5(16.83°B)
and lowest (14.29 °B) was recorded in T11S1 which was followed by T5S1(14.52°) and
T3S1(14.96°B)
on the day of harvest (Table 4.1.1).

4.1.2. pH

The data on pH presented in Table 4.1.2 and Figure ___
indicates that there was significant change in pH of the pomegranate arils and
it was found declined during storage period. In different storage intervals pH
was found highest in S2(4.51) and S1(4.50) on 8th and 1st
day of storage as compared to other storage intervals and whereas lowest pH was
recorded in S4 (4.30) and S5(4.30) on 12 and 16 days after storage
of fruits. Irrespective of treatments pH of the arils gradually showed
decreasing trend from the day of harvest to end of of storage. The fruits treated
with calcium chloride(T2) was recorded highest (4.37) pH and was on par with
T8, T1, T10, T7, T6 and T9 while the lowest pH was recorded in T12(4.29) which
was on par with T11 (4.29).

The interaction between treatments and storage on pH
of pomegranate fruits was found significant. in fruits in T7S1 (4.74) was recorded
significantly highest pH and it was on par with T2S1as compared to all other
treatments.  However, the lowest pH was
recorded in T12S3 (4.10) fruits which were at a par with T11S5(4.12).

4.1.3. Titratable Acidity (TA %)

Both the treated as well as untreated pomegranate
fruits have registered a continual significantly increase in the TA during
storage at ambient conditions (Table 4.1.3). However, the treated fruits have
shown a significant slow increase over the untreated (control) pomegranate
fruits. In different storage intervals, the highest (0.67%) was recorded in S5
which was followed by S4 and lowest TA (0.48 %) was observed in S1 during
storage of pomegranate and Whereas, among different treatments highest TA was
recorded in T1 (0.65 %) which was followed by T10 (0.51%) and lowest TA was
recorded in T5 (0.48%) irrespective of the storage period. The interaction,
treatment x storage period (T x S) was also significant as the highest TA (0.78
%) was observed in pomegranate fruits treated with Salicylic acid (2 mM) on the
12th day after harvest, and the lowest TA (0.28 %) was observed in
fruits received GA3(100 ppm) with BA(75ppm) (T5S1) on the day of harvest which
was on par with T4S1 (Table 4.1.3).

4.1.4. Ascorbic
Acid Content (AAC mg 100g-1)

It has been observed that the AAC of ‘Bhagwa’
pomegranate fruits had significantly decreased progressively with increase in
storage period (Table 4.1.4). In different storage intervals significantly
highest AAC was recorded in S1 which was followed by S2, whereas among all the different
treatments: T1 (11.79) recorded highest AAC which was followed by T7, T5, T6,
T3, T2 and T4 and lowest was observed in T12(10.59). At the end of storage life,
the interaction between treatment x storage period (T x S) was also significant
as the highest AAC (13.80, 13.80 and 13.80) was observed in T4S1, T1S1 and T9S1
respectively whereas the lowest AAC was observed in T11S5 (7.80) which was on
par with T12S5 and T9S5 (Table 4.1.4).

 

 

4.1.5. Total Antioxidant Activity (µmol
AAE g-1 FW)

All the treatments have maintained higher total
antioxidant capacity in the ‘Bhagwa’ pomegranate fruits than in untreated
fruits during storage at ambient conditions (Table 4.1.5). Irrespective of the
storage period, the total antioxidant capacity was maximum (160.85 µmol AAE g-1
FW) in the fruits on the day of harvest and the lowest was recorded in S5
(110.63 µmol AAE g-1 FW) at the end of the storage (Table 4.1.5).
Similarly, among treatments it differed significantly with highest (147.28 µmol
AAE g-1 FW) antioxidants in T11 which was on par with T5 and T9 and the
lowest antioxidant capacity (126.50 µmol AAE g-1 FW) was observed in
untreated fruits. There was a significant interaction between the treatment and
storage period and the highest antioxidant capacity (168.76 µmol AAE g-1
FW) was exhibited by fruits treatments T11S1 on the day of harvest which was on
par with T9S1 and T3S1 and lowest (100.19 µmol AAE g-1 FW) was
observed in untreated fruits, which was significantly followed by T1S5 (Table
4.1.5).

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