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Acta Alimentaria
Authors:
Á. Ribárszki
,
D. Székely
,
B. Szabó-Nótin
,
B. Góczán
,
L. Friedrich
,
Q.D. Nguyen
, and
M. Máté

against many diseases such as cardiovascular diseases, cancer, asthma, lung diseases, and diabetes ( Zhu et al., 2021 ). Apple juice, especially that is not from concentrate (NFC), is one of the most popular products ( Pardo and Borges, 2020

Open access

presence of patulin in fruit juices . Food Addit. Contam. B , 3 , 114 – 119 . B rackett , R.E. & M arth , E.H. ( 1979 ): Patulin in apple juice from roadside stands in Wisconsin

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Acta Alimentaria
Authors:
S. Aguilar-Rosas
,
M. Ballinas-Casarrubias
,
L. Elias-Ogaz
,
O. Martin-Belloso
, and
E. Ortega-Rivas

Pasteurisation of apple juice by a high temperature-short time treatment (HTST) at 90 °C for 30 s was compared with a high-voltage pulsed electric field treatment (PEF). The PEF treatment was carried out using a laboratory unit set with a bipolar pulse (4 μs wide), an intensity of 35 kV cm−1, and a frequency of 1200 pulses per second (pps). Enzyme inactivation and colour changes of the treated juices were compared, using a non-treated sample as control. Enzyme residual activities of pectinmethylesterase (PME) and polyphenoloxidase (PPO), as well as the chroma index for colour, showed statistical difference between treatments. No statistical significant difference was observed for the hue colour index. PEF could be considered a feasible alternative for producing pasteurised and stable apple juice.

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. These classes of substances provide defence mechanisms for plants against microorganisms, insects, and plant pests ( Sun et al., 2002 ). Therefore, in our research, we enriched apple juice (EPA) by adding an elderberry pomace extract rich in antioxidants

Open access
Acta Alimentaria
Authors:
V. Losó
,
A. Tóth
,
A. Gere
,
J. Heszberger
,
G. Székely
,
Z. Kókai
, and
L. Sipos

): Sensory interpretation of instrumental measurements 2: sweet and acid taste of apple juice. Postharvest Biol. Technol. , 24 , 241–250. Walker S.B. Sensory interpretation of

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The application of immobilized enzyme for catalyzing various biotransformation processes is a widely used approach at present. This work mainly focused on the immobilization of polygalacturonase from Aspergillus niger Van Tieghem (MTCC 3323) on Nylon-6 by covalent binding, keeping in view its applicability in apple juice clarification. The immobilized enzyme was characterized in terms of kinetic parameters, thermal stability and reusability. The enzyme was immobilized onto glutaraldehyde-activated Nylon-6 by covalent binding and the efficiency of immobilization was found to be 40%. The immobilization yielded a protein loading of 70 μg g −1 of Nylon-6. Immobilized enzyme showed maximum activity at a temperature of 50 °C and pH 5.0. The enzyme was stable between pH 4.0–5.5. The immobilized enzyme could be reused through 4 cycles with almost 50% retention of its original activity. It had increased thermostability over its soluble form at 25 °C and 45 °C. Kinetic parameters K m and V max were found to be 7.6 mg ml −1 and 41.66 μmol of galacturonic acid/ml/min, respectively. The immobilized enzyme when used for apple juice clarification showed about 50% increase in transmittance of apple juice at 650 nm. This increase was observed at enzyme concentration of 20 U ml −1 apple juice, temperature 50 °C and incubation time of one hour. The optimization of these factors, which affect the stability and productivity of the immobilized system, resulted in an increase in enzyme stability and the possibility of economic application of immobilized enzyme at large scale apple juice clarification.

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BahceçI, K.S. & Acar, J. (2007): Determination of guaiacol produced by Alicyclobacillus acidoterrestris in apple juice by using HPLC and spectrophotometric methods, and mathematical modeling of

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Our knowledge on the presence of mycotoxin producing fungi and mycotoxins in food commodities in the last decade in Hungary has been summarized in this review. Among the mycotoxin producing fungi, detailed data are available for Fusarium species in cereals, and mycotoxigenic Aspergillus species in different food commodities including coffee, raisins and spices. Ochratoxin concentrations above the tolerable limit have mostly been detected in imported products such as peanuts and coffee. Ochratoxin levels close to the tolerable limit have been observed in Hungarian red peppers. Besides, ochratoxin A has also been detected in Hungarian wine, beer and raisins. Aflatoxins are usually detected in considerable quantities only in imported agricultural products in Hungary, while patulin concentrations were usually below the allowable limit in Hungarian apple juice concentrates. In the future, continuous sampling and analysis of foods and feeds are required to ensure consumer safety in Hungary.

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An amperometric biosensor for the detection of organophosphorus and carbamate type pesticides was developed. Acetylcholinesterase enzyme (electric eel) was immobilized in a thin-layer enzyme cell, and acetylthiocholine chloride (AcTCh) was used as substrate. Amperometric detection with glassy carbon electrode was performed in a stopped-flow FIA system. The inhibition effect of dichlorvos (DDVP), carbofuran, methomyl, and pirimicarb were examined: the linear measuring ranges were 0.001–0.1 μmol l−1, 0.001–0.1 μmol l−1, 0.2-1 μmol l−1, and 0.1–10 μmol l−1, respectively. Soil extract and apple juice were measured with spiking method. It was concluded that the biosensor can be used for screening pesticide residues in food and environmental samples.

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., Covill, N. (1999) The antifungal properties of chitosan in laboratory media and apple juice. Int. J. Food Microbiol. 47 , 67–77. Covill N. The antifungal properties of chitosan in

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