Investigation of the production possibilities of chestnut pickles


Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, ZİRAAT FAKÜLTESİ, GIDA MÜHENDİSLİĞİ, Turkey

Approval Date: 2019

Thesis Language: Turkish

Student: BETÜL AVŞAR

Supervisor: Ömer Utku Çopur

Abstract:

In this study, production of a new chesnut pickle by using different pre-treatments and brine ratios was aimed. Chesnuts were pickled without any pre-treatment and the pretreatments like boiling (7, 9 min) and roasting (3, 5min) in different salt ratios (5, 7 g/100 mL) and using brine including 0,32 g/100 mL acetic acid and 0,05 g/100g garlic. Chesnuts were filled into glass jars and pasteurized at 98°C for 15 minutes. Total acidity, pH and salt contents of the pickles were respectively ranged between 0,34 - 0,40 g/100 mL (acetic acid), 3,46 - 3,87 and 2,46 - 3,51 g/100 mL. Total dry matter content of the pickles (60,53 - 66,52 g/100g) were raised compared with chestnut (54,97 g/100g), while total sugar (chesnut: 7,44 g/100g, pickles: 2,13 -3,53 g/100g), invert sugar (chesnut: 0,53 g/100g, pickles: 0,28 - 0,45 g/100g) and starch (chesnut: 33,87 pickles: 18,61 - 23,67 g/100g) were decreased. For color, L*,b*, Chroma (C*) and Hue of the pickles were decreased in comparison to chesnut while a* was raised. Total phenolic matter of the pickles were changed between 68,14-126,11 mg GAE (gallicacid equivalent) /100g dry matter (dm).Total antioxidant capacity of the pickles showed a decrement compared to chesnut and ranged between as the highest in FRAP (12,36 - 21,38 μmol trolox/g dm), CUPRAC(6,47 - 14,83 μmol trolox/g dm) and DPPH (6,10- 6,79 μmol trolox/g dm) assays respectively. All of the samples were accepted sensorially according to color, odor, taste, texture, salt ratio and overall acceptability criteria and the usage of chesnut with several pre-treatments enabled the production of an alternative pickle.