Kinetics of Moisture Loss and Oil Absorption of Pork Rinds during Deep-Fat, Microwave-Assisted and Vacuum Frying

The fat content of fried pork rinds is high, and alternative frying helps reduce the oil content and maintain their texture and taste. Different frying methods such as microwave-assisted, traditional deep frying and vacuum frying on the breaking force, color, microstructure, water loss and oil absorption attributes of fried pork rinds were evaluated in this study. The fat content of microwave-assisted and vacuum-fried pork rinds was lower (24.2 g/100 g dry weight basis (db) and 17.1 g/100 g db, respectively) than that (35.6 g/100 g db) of traditional deep-fat frying. Non-uniform, holy and irregular surface microstructures were obtained by vacuum frying due to rapid mass transfer at low pressure. The first-order kinetic models of water loss and oil absorption of traditional and microwave-assisted frying of pork rinds were established. Microwave frying caused a faster moisture loss rate, shorter frying time and lower pork rind oil content, makes it an attractive substitute for traditional deep-fat frying.

Perbedaan Lemak Jenuh dan Tak Jenuh Keripik Labu Kuning Metode Vacuum Frying dengan Menggunakan Minyak Berulang

<p>Masyarakat saat ini cenderung untuk mengonsumsi fast food yang mengandung tinggi kalori, rendah serat, tinggi lemak jenuh dan kolesterol yang dapat memicu terjadinya sindrom metabolik salah satunya dislipidemia. Labu kuning memiliki kadar kolesterol rendah dan pengolahan menjadi keripik dengan metode Vacuum Frying bertujuan untuk mempertahankan kualitas bahan pangan dan mengurangi kerusakan pada minyak goreng akibat hidrolisis. Tujuan dari penelitian ini adalah untuk mengetahui perbedaan kadar asam lemak jenuh dan tak jenuh keripik labu kuning metode Vacuum Frying dengan penggunaan minyak berulang pada kelipatan penggorengan ke 1, ke 5 dan ke 10. Metode penelitian ini bersifat Quasi Eksperimental dengan 3 kelompok dan 2 kali replikasi. Pengujian kadar asam lemak jenuh menggunakan metode GC FID dan asam lemak tak jenuh dengan metode kromatografi gas. Data dianalisa menggunakan SPSS Versi 21.0 dengan uji shapiro wilk dilanjutkan uji kruskal wallis. Hasil penelitian ini adalah tidak ada perbedaan kadar asam lemak jenuh (p&gt;0,05), tidak ada penurunan kadar asam palmitoleat (p=0,565) , asam alpha linolenat (p=0,156 ) dan asam gamma linolenat (p=0,276) pada keripik labu kuning. Karena tidak ada perubahan kadar asam lemak jenuh dan tak jenuh, maka keripik labu kuning dapat dijadikan alternatif snack bagi penderita dislipidemia. </p>

Studi Pengaruh Suhu dan Lama Penggorengan Terhadap Kualitas Jamur Tiram (Pleurotus osteatus) dengan Penggorengan Vacum

Oyster mushroom is one type of vegetable that is rarely utilized due to a lack of knowledge about how to process the mushroom itself. The perishable nature of mushrooms causes difficulties in distribution and marketing as fresh produce. One of the processed products from oyster mushrooms is chips. Vacuum frying is a frying method that is applied to heat-sensitive materials such as fruits and vegetables. This study was aimed to determine the effect of temperature and duration of vacuum frying on the physicochemical and organoleptic qualities of oyster mushroom chips. The study was conducted using a completely randomized design with a two-factor factorial pattern: the first factor, vacuum frying with a temperature of 85o and 90oC. The second factor, frying time, is 50, 60, and 70 minutes. The results showed that vacuum-fried oyster mushrooms with a temperature of 85oC and a frying time of 70 minutes produced oyster mushroom chips with the lowest fat content of 38.08%, the preferred taste, and color (score 4), while the preferred texture was frying at 90oC and long 70 minutes. The yield value and moisture content of oyster mushroom chips did not differ at different temperatures and frying times. Keywords: Oyster mushroom; vacuum frying; chips; temperature ABSTRAK Jamur tiram merupakan salah satu jenis sayuran yang pemanfaatannya sangat sedikit karena kurangnya pengetahuan tentang cara mengolah jamur itu sendiri. Sifat jamur yang mudah rusak menyebabkan kesulitan dalam distribusi dan pemasaran sebagai produk segar. Salah satu produk olahan dari jamur tiram adalah keripik. Penggorengan vakum merupakan metode penggorengan yang diterapkan pada bahan yang peka terhadap panas seperti buah-buahan dan sayuran. Penelitian bertujuan mengetahui pengaruh suhu dan lama waktu penggorengan vakum terhadap kualitas fisikokimia dan organoleptik keripik jamur tiram. Penelitian dilakukan menggunakan rancangan acak lengkap dengan pola faktorial dua faktor. Faktor pertama, penggorengan vakum dengan suhu 85o dan 90oC. Faktor kedua, lama penggorengan adalah 50, 60, dan 70 menit. Hasil penelitian menunjukkan jamur tiram yang digoreng vakum dengan suhu 85oC dan lama penggorengan 70 menit menghasilkan keripik jamur tiram dengan kadar lemak terendah 38,08%, rasa, dan warna yang disukai (skor 4), sedangkan tekstur yang disukai adalah penggorengan pada suhu 90oC dan lama. 70 menit. Nilai rendemen dan kadar air keripik jamur tiram tidak menunjukkan perbedaan pada suhu dan waktu penggorengan yang berbeda. Kata kunci: Jamur tiram; keripik; penggorengan vakum; suhu

Effects of vacuum frying on the quality of king orange peel in manufacture of chocolate candy fillings

Deep-fried orange peel applied vacuum-frying technique to extend its shelf life and to create crispy product that contains natural nutrients, especially looking for marketplace of the product and increasing the value of orange by-products. The effects of vacuum frying conditions on the quality of fried orange peel was evaluated to produce nutritional chocolate candy fillings that has good sensory values. Orange peel slices were fried under vacuum (20 in of Hg) using sunflower frying oil at various temperatures (80°C, 85°C, 90°C, 95°C and 100°C) for different amounts of time (5, 10, 15, 20, 25 and 30 min). After frying, the fried orange peel slices were centrifuged at 140 - 1000 × g for 4 min to remove the frying oil. Results of this study suggest that vacuum frying at 100°C for 30 min showed maximum shrinkage (48%) and 95% of carotenoids were lost. The hardness of fried orange peel increased during the frying process. Sensory evaluation showed maximum acceptability for fried orange peels at 90°C for 25 min. The TBARS indicated a high deterioration in the atmospheric frying oil quality. In contrast, the vacuum frying condition helped preserve the frying oil quality, while the light color of the product was maintained. The results supported the use of the vacuum frying process as a method for frying high quality king orange peel and conserving the quality of oil in the king orange peel.

Effects of Frying Processes on the Nutritional and Sensory Characteristics of Different Mackerel Products

Studies have reported the impact of frying on the nutritional and sensory properties of mackerel. However, no study has reviewed this topic. This study reviewed the effects of different frying processes on the nutritional and sensory characteristics of mackerel, with and without batter, marinade, and spice. MEDLINE, Web of Science, PubMed, and ScienceDirect were used as online databases to find relevant articles. We found that the nutritional, physicochemical, and sensory properties of fried mackerel without treatment were influenced by frying methods. Deep frying affected the oxidation of lipids and degradation of proteins, while air frying increased the overall acceptance score. Frying can reduce perfluorinated compounds (PFCs), eliminate some toxins, lower the trypsin inhibitor (TI), and increase the sensory parameters of mackerel with batter, marinade, and spice treatment. The different ingredients of minced mackerel products preserved their nutritional and sensory parameters after frying. Interestingly, vacuum frying resulted in lower oxidation and maintenance of nutritional and sensory parameters of fried mackerel (with or without treatment) and minced mackerel products. Further research is needed to reveal the effectiveness of vacuum frying in maintaining the nutritional and sensory properties of fried and minced mackerel products.

Effects of Vacuum Frying on the Preparation of Ready-to-Heat Batter-Fried and Sauced Chub Mackerel (Scomber japonicus)

Chub mackerel (CM) is a commercial fish in Korea, owing to its availability and nutritional values. This study aimed to develop a ready-to-heat (RTH) Korean preparation of CM, known as Godeungo gangjeong. We utilized vacuum frying technology to fry the CM and evaluated its quality. Conventional frying with a deep fryer was performed in parallel to assess the superiority of the vacuum fryer. We optimized the frying conditions of vacuum frying (VBF) and deep frying (DBF) using response surface methodology. At optimum conditions of 95 °C for 7 min 42 s, VBF produced better sensory, chemical, and microbial properties than DBF at 190 °C for 5 min 30 s. The nutritional values, including amino acid and fatty acid contents, were investigated and found to be higher in VBF than in DBF. Sensory properties also showed better scores on VBF than DBF, especially in appearance, aroma, taste, and overall acceptability. The VBF produced lower volatile basic nitrogen (VBN), thiobarbituric acid reactive substances (TBARS), and total bacterial count (TBC) than DBF. The findings confirmed that vacuum frying is a better option to produce RTH Godeungo gangjeong, since it provides less oxidation and maintains the product quality. Using the Arrhenius approach, the product was concluded to preserve both quality and safety for 9 months of storage at −18 °C.

Application of Deep, Vacuum, and Air Frying Methods to Fry Chub Mackerel (Scomber japonicus)

Frying is an old method of processing food, especially fish. Mackerel is one of the most consumed fish worldwide because of its high nutritional value. Previously, only a study on the effects of deep frying of fried mackerel has been performed. However, no study has been conducted on the effects of different frying methods on the physiochemical and nutritional properties of chub mackerel. Therefore, in this study, we evaluated the physiochemical and nutritional characteristics of deep fried, vacuum fried, and air fried chub mackerel. Thawing methods were compared and the best method was selected. High frequency defrosting (HFD) was used to thaw frozen fillet mackerel before frying. Response surface methodology (RSM) was used to optimize the temperature and frying time of the three frying methods. The physiochemical and nutritional characteristics, including volatile basic nitrogen (VBN), thiobarbituric acid-reactive substances (TBARS), pH, overall acceptance, proximate, fatty acid, and amino acids of fried mackerel were investigated. The HFD exhibited the lowest number of drips with a short thawing time. The RSM showed that the optimum temperature and frying time for deep, vacuum, and air frying were 165 °C for 3 min, 95 °C for 7 min, and 160 °C for 15 min, respectively. Vacuum frying showed the lowest increase in VBN, TBARS, and pH, and significantly (p < 0.05) differed from the others. It also resulted in increased amino acid and preserved fatty acid content. These findings suggest that vacuum frying is the best frying method which has little oxidation and can maintain nutrition. The results of this study could be applied in the fisheries industry to produce the best fried mackerel and preserve its high nutritive value.