Pectin is a heteropolysaccharide obtained from primary cell walls of terrestrial plants, which is a very
important raw material for food and pharmaceutical products. Extraction of pectin from the peels of
yellow passion fruit (Passiflora edulis f. flavicarpa) under microwave-induced heating was investigated in
the present study. Three types of acids (tartaric, acetic and nitric acid) were employed as extracting
agents. The effect of extraction time and microwave-power on yield of pectin has been studied using the
response surface methodology. The results indicate that exposure time and microwave-power significantly
affects the yield of pectin extraction with both nitric and tartaric acids. However, the extractions
using acetic acid were significantly affected only by the exposure time. For all scenarios, the highest
yields were obtained when the highest levels of power and time were used (628 W and 9 min). Under
these conditions, the yield of pectin obtained with nitric and acetic acids were 13 and 12.9% respectively.
Tartaric acid emerged as the best extracting agent in terms of yield (18.2%), however, the obtained pectin
exhibited low purity and low degree of esterification. Pectin extracted from passion fruit by employing
acetic and nitric acid presented better properties: high molar mass (4.625 105 for acetic acid and
4.966 105 for nitric acid), degree of esterification (64.56% for acetic acid and 64.15% for nitric acid) and
content of uronic acids (62.5% for acetic acid and 82.3% for nitric acid).
Pectin is a heteropolysaccharide obtained from primary cell walls of terrestrial plants, which is a very
important raw material for food and pharmaceutical products. Extraction of pectin from the peels of
yellow passion fruit (Passiflora edulis f. flavicarpa) under microwave-induced heating was investigated in
the present study. Three types of acids (tartaric, acetic and nitric acid) were employed as extracting
agents. The effect of extraction time and microwave-power on yield of pectin has been studied using the
response surface methodology. The results indicate that exposure time and microwave-power significantly
affects the yield of pectin extraction with both nitric and tartaric acids. However, the extractions
using acetic acid were significantly affected only by the exposure time. For all scenarios, the highest
yields were obtained when the highest levels of power and time were used (628 W and 9 min). Under
these conditions, the yield of pectin obtained with nitric and acetic acids were 13 and 12.9% respectively.
Tartaric acid emerged as the best extracting agent in terms of yield (18.2%), however, the obtained pectin
exhibited low purity and low degree of esterification. Pectin extracted from passion fruit by employing
acetic and nitric acid presented better properties: high molar mass (4.625 105 for acetic acid and
4.966 105 for nitric acid), degree of esterification (64.56% for acetic acid and 64.15% for nitric acid) and
content of uronic acids (62.5% for acetic acid and 82.3% for nitric acid).
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