Nenko Nenov

Nenko Nenov
InnoSolv LLC

PhD

About

88
Publications
23,905
Reads
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280
Citations
Additional affiliations
April 2009 - present
InnoSolv ltd.
Position
  • Owner
Description
  • Development of novel techniques for biomass extraction and separation of natural products
May 1997 - July 2016
University of Food Technologies
Position
  • Researcher
May 1997 - present
University of Food Technologies
Position
  • Lecturer
Education
May 1998 - August 1998
The University of Manchester
Field of study
  • Process Integration
September 1989 - June 1994
Higher Institute of Food and Flavour Industries
Field of study
  • Heat and Mass Transfer Equipment

Publications

Publications (88)
Article
Full-text available
The process of the distillation is widely used in manufacturing of essential oil. In this study is used the process of distillation with aim of obtaining essential oil from fruits of fennel in experimental laboratory distillation installation. The distillation curve for extraction of essential oils from the process of distillation at different temp...
Method
Full-text available
Anes-96 ltd. And InnoSolv ltd. present their innovative technology for purification and recycling of waste lubricant grease from machineries. It is intended for removing of mechanical impurities from waste grease and thus making possible its restored application. The technology has very positive impact on avoiding environment pollution. Some of adv...
Presentation
Full-text available
A novel nitrogen assisted method for acetonitrile recovery from HPLC
Article
Full-text available
New InnoSolv llc. device for low temperature nitrogen assisted distillation was used for wine dealcoholization. The method approved by virtue of collaboration of InoSolv Ltd and UFT include evaporation of alcohol and other volatiles at a temperature not exceeding 32 °C in entirely nitrogen atmosphere. The three regime of wine treatment were used, r...
Article
Full-text available
Purpose Two major developments have taken place in the agri-food industry in recent decades. First, valorization of the plant by-products can contribute significantly for ensuring sustainability, especially applying green technologies for recovery of bio- and/or techno-functional compounds. Second, substitution of synthetic food additives, particul...
Article
Full-text available
Rosmarinic acid (RA), an ester of caffeic acid and 3,4-dihydroxyphenyllactic acid, is a potent radical scavenger, a chelator of prooxidant ions, and an inhibitor of lipid peroxidation. RA-containing extracts are widely used natural antioxidants in food products, and many herbal preparations and food supplements, containing RA, are marketed with cla...
Article
Full-text available
The aerial parts of Artemisia annua L. from Bulgaria were extracted with 1,1,1,2-tetrafluoroethane. Static two-stage extraction at a pressure of 8 and 12 bar was used at a relatively low temperature. The yield was 2%. The chemical profile of the product was reported for the first time. GC-MS analysis showed that the extract contained the essential...
Article
Full-text available
Studies were conducted to explore the extraction of dry German chamomile (Matricaria chamomilla L.) using pressurized hot water for deriving the active ingredient apigenin. For the purpose, a series of tests were conducted under identical conditions, using dry untreated raw material in one case, and steam-distilled raw material in the other case. E...
Article
Full-text available
A review and analysis of application of open cycle heat pumps with mechanical compression in distillation and evaporation plants are performed. Main elements and specifics of operation of heat pump system are considered. Characteristics for energy efficiency assessment of heat pump systems are given. Introduction Heat pump is a device that transfer...
Article
Full-text available
A review and analysis of application of open cycle heat pumps with mechanical compression in industrial facilities are performed. The principle of operation of a mechanical heat pump, main elements and operation specifics are considered. Characteristics for energy efficiency of open cycle heat pump systems are given.
Poster
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Rice husk (hull) is the main by-product from rice milling industry. This study investigated the potential for utilization of rice husk as a source of polyphenols. A novel process, combining enzyme-assisted and subcritical water extraction, was established on a pilot-plant scale. Recovery rate of total polyphenols (2.97 g GAE/kg rice husk powder) wa...
Article
Full-text available
A comprehensive chemical profiling of 1,1,1,2-tetrafluoroethane (freon R134a) subcritical extracts from the main genotypes of oil-bearing roses, was performed by gas chromatography–mass spectrometry (GC/MS) and gas chromatography with flame ionization detection (GC-FID) in order to reveal the differences in their chemical composition. One hundred a...
Article
Full-text available
Subcritical extraction of Rosa damascena Mill. was performed with Freon 143a. The pressure and duration of the process were studied to obtain the yield. It was found that a short-time triple extraction at low pressures of 5-6 bar resulted in the highest yield – 0.151%. The chemical composition of the product revealed a high scent content: β-phenyle...
Article
Full-text available
Rice husk is the main by-product (waste) from rice milling industry. The present study evaluated the co-pigmentation efficiency of polyphenol-enriched extract (co-pigment) from rice husk in a model system of strawberry anthocyanins (pigment). Following green technology approach, the rice husk polyphenols were recovered using subcritical water extra...
Article
Comprehensive chemical profiling of threeRosa damascena Mill. essential oil samples and two extracts (supercritical and subcritical) was performed by means of GC/MS/FID. As a result 85 compounds, representing 87.9-99.2% of the detected compounds, were identified by GC/MS and simultaneously quantified by GC-FID.The main aroma constituents in the ess...
Experiment Findings
Full-text available
1. Developing of theoretical base for the method. 2. Creation of software tool for simulations and prediction of vapours mixture behaviour. 3. Design and erection of pilot equipment for this method. 4. Confirmation and deviation assesment of experimental findings compared with theoretical simulation
Article
Full-text available
In the context of growing interest for functional foods and cosmetic products, emulsified products such as dressings or lotions have been proposed to deliver probiotics and plant extracts with interesting biological (e. g. anti-inflammatory) properties due to their daily consumption or application on skin, respectively. Besides these positive effec...
Experiment Findings
Full-text available
Raw material - frozen rose petals (Rosa damascena) Period of experiments - August to September Processed quantity - 2000 kg Equipment - Industrial scale 2x200 l raw materia capacity Extraction pressure - 9.5-9.8 bara Extraction tempetarure - 38o C Extraction time - 60-80 min On picture WaxClouds.jpeg - TFE rose extract diluted in alcohol. Wax clou...
Article
Full-text available
Cacao and rose waste, generated yearly by chocolate and rose-oil industry, respectively, pose to the manufacturers' difficulties for disposal. These by-products are underused and represent also sources of valuable substances: polyphenols, polysaccharides, aroma substances, etc. The aim of the present work was to characterize cacao waste and evaluat...
Article
Full-text available
Chocolate industry generates yearly large quantities of cacao wastes. These by-products pose to the manufacturers’ difficulties for disposal and represent also valuable sources of substances: polysaccharides, polyphenols, etc. The aim of the present work was to characterize cacao waste and search for possible food applications. The waste was invest...
Article
Full-text available
Mechanical vapour recompression heat pump systems are widely used in the industry -in evaporator and distillation installations, in seawater desalination and industrial wastewater treatment plants. The estimation of the energy efficiency level of this type of system is based on values of two basic parameters: specific energy consumption for product...
Conference Paper
Full-text available
The object of the study is mechanical vapor recompression heat pump for treatment of industrial wastewater. A mathematical regression equation between the specific consumption of electrical energy and two significant factors-temperature of secondary vapor and compression ratio of vapor in mechanical compressor heat pump is received.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substancies from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractor volume is 10 l and handling is manual one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substancies from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractor volume is 10 l and handling is manual one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substancies from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractor volume is 25 l and handling is fully automated one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substancies from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractor volume is 1 l and handling is manual one.
Technical Report
Full-text available
The superheated water extraction unit is intended for extraction of aroma preparations and active substancies from plant material like spices, herbs, flowers, etc. It uses water only and produces alcohol-free extracts. Extractor volume is 2 l and handling is manual one.
Technical Report
Full-text available
The steam distillation unit is intended for production of essential oils from plant materials like spices, herbs, flowers, etc. The retort volume is 30 l and handling is manual one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substances from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractors volume is 50 l each and handling is manual one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substances from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractors volume is 100 l each and handling is fully automated one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substances from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractors volume is 10 l each and handling is fully automated one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substances from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractor volume is 1 l and handling is fully automated one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substancies from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent and heat pump facility for mild and cost effective process. Extractor volume is 25 l and handling is fully automated one.
Technical Report
Full-text available
The liquefied gas extraction unit is intended for extraction of aroma preparations and active substances from plant material like spices, herbs, flowers, etc. It uses food grade liquefied gas solvent, flow circulation and heat pump facility for mild and cost effective process. Extractor volume is 10 l and handling is fully automated one.
Article
Full-text available
Object of the present study is an experimental determination of the values of thermodynamic parameters of mechanical heat pump system: isentropic efficiency of mechanical compressor, polytropic index in the process of compression and heat capacity of water vapor. A classic experiment by two significant factors with three levels of variation of temp...
Article
Full-text available
The dry‐fermented sausages are under high risk of microbial cross‐contamination and physical impurities come from ground spices because they are not subjected to heat treatment. So, the objective of this study was to investigate the replacement of 3 g/kg ground black pepper ( Piper nigrum L.), and cumin ( Cuminum cyminum ) with their aliquots of te...
Article
Full-text available
Several indicators of industrial wastewater are analyzed – chemical oxygen demand, pH factor, electrical conductivity. Opportunities for discharge of purified industrial wastewater with heat pump system accordance with the regulations of Bulgaria are presented.
Article
Full-text available
Mathematical relation between regeneration ratio and concentration ratio of industrial wastewater is received. Dry matter content of industrial wastewater are analyzed. For several examples of industrial wastewater microbiological analysis are made - results for values of colony forming unit and pathogens are received.
Article
Full-text available
The chemical composition of extract from the Bulgarian essential oil bearing plants from Lamiaceae family-oregano (Origanum heracleoticum L.) by extraction with C 2 H 2 F 4 (1,1,1,2-tetrafluorethane) was analyzed using GC and GC/MS. The main compounds (concentration higher than 3 %) of extract was as follows: carvacrol (70.05 %), p-cymene (11.83 %)...
Article
Full-text available
Химичният състав на екстракт от цвят на невен (Calendula officinalis L.), получен при екстракция с 1,1,1,2-тетрафлуороетан е изследван чрез GC and GC/MS анализ. Главните компоненти (концентрация над 3 %) в екстракта са: α-бизаболон оксид (8,33 %), β-фарнезен (8,10 %), α-бизаболон оксид А (7,28 %), α-пинен (6,84 %), γ-кадинен (5,47 %), р-цимен (5,44...
Article
Full-text available
The chemical composition of aromatic products from sumac (Cotinus coggygria Scop.) was analysed by GC and GC/MS. The essential oil obtained by hydrodistillation and the extract by extraction with C 2 H 2 F 4 (1,1,1,2-tetrafluorethane). The main compounds (concentration higher than 3 %) of the essential oil were limonene (23,7 %), α-pinene (15,7 %),...
Article
Full-text available
Antimicrobial activity of essential oils and extracts from black pepper, cumin, coriander and cardamom against some pathogenic and saprophytic microorganisms. Bulg. J. Vet. Med. (online first). The antimicrobial activity of essential oils and extracts of fruits of black pepper (Piper nigrum L.), cumin (Cuminum cyminum L.), coriander (Coriandrum sat...
Conference Paper
Full-text available
The chemical composition of extract from lavender (Lavandula angustifolia Mill.) by extraction with tetrafluoroethane was analyzed using GC and GC/MS. The main compounds (concentration higher than 3%) of extract were: linalool (32.48%), linalyl acetate (22.98%), borneol (5.12%), cis-linaloloxide (4.49%), (E)-β-farnesene (4.10%), lavandulol (4.22%)...
Article
Full-text available
Създадена е пилотна термопомпена инсталация за очистване на промишлени отпадъчни води с производителност по кондензат 15 kg/h. В нея чрез кипене на отпадъчната вода и механична компресия на вторичните пари се постига значително намаляване на обема и при занижени енергийни разходи. Инсталацията може да позволи и рециклиране на вода чрез повторно изп...
Article
Full-text available
Working principles and main parts of mechanical vapor recompression system for treatment and recycling of industrial waste waters are described. Advantages and drawbacks of proposed system are stated. A software for economic analysis and evaluation of proposed systems in wide variety of initial data and processes is created. An example for efficien...
Conference Paper
Full-text available
The chemical composition of extract from the Bulgarian essential oil bearing plants from Lamiaceae family - peppermint (Mentha piperita L.) by extraction with C2H2F4 (1,1,1,2-tetrafluorethane) was analyzed using GC and GC/MS. The main compounds (concentration higher than 3 %) of extract was as follows: menthone (30.54 %), menthol (21.12 %), menthyl...
Conference Paper
Исследованы эффекты режимов пастеризации и количества сычужного фермента на процессе сычужно-кислотной коагуляции для получения свежего высокожирного сыра с добавлением кукурузного масла. Разработаны математические модели о влияние температурных режимов 82–88С0/5 min и количестве сычужного фермента l-5ml/100 l по показателям жирности и сухого вещес...
Article
Full-text available
The chemical composition of aromatic products from sage (Salvia officinalis L.) was analysed by GC and GC/MS. The essential oil obtained by hydro-distillation and the extract by extraction with C2H2F4 (1,1,1,2-tetrafluorethane). The main compounds (concentration higher than 3 %) of the essential oil were 1,8-cineole (25.2 %), E-β-caryophyllene (7.5...
Article
Full-text available
The chemical composition of extract from basil (Ocimum basilicum L.) by extraction with C 2 H 2 F 4 (1,1,1,2-tetrafluoroethane) was analyzed using GC and GC/MS. The main compounds (concentration higher than 3 %) were: estragole (46.97 %), linalool (10.64 %), methyl eugenol (8.94 %), 1,8-cineole (3.74 %) and -bisabolene (3.06 %). The studied extrac...
Article
Full-text available
The chemical composition of extract from the dill (Anethum graveolens L.) by extraction with tetrafluoroethane was analyzed using GC and GC/MS. The main compounds (concentration higher than 3 %) of extract were: D-carvon (53,12 %)and limonen (37,12 %). The studied extract demonstrated antimicrobial activity against Gram-positive bacteria. The extra...
Article
Full-text available
The lipid composition from waste of chokeberry (Aronia melanocarpa (Michx) Elliott.) extraction with freon134a (1,1,1,2-tetrafluorethane) and with freon 134a+acetone was analyzed using GC and HPLC. The main components in the triacylglycerol fractions were linoleic (47.8 – 57.2%), oleic (26.4 – 28.4%) and palmitic (11.0 – 15.5%) acids.-Tocopherol (5...
Article
Full-text available
This paper investigates mayonnaise-like food emulsions with natural spices and herbs and new type of extracts. The microbiological quality, oxidative stability and sensory perception of the food emulsions were analyzed. Mayonnaise and salad dressing were prepared with extra virgin olive oil at 50% and 25% oil-phase volume, respectively. Results dem...
Article
Full-text available
The chemical composition of extract from the seeds of cardamom (Elettaria cardamomum (L.) Maton, obtained by extraction with tetrafluoroethane was analyzed using GC and GC/MS. The major compounds (concentration higher than 3%) of extract were: terpinyl acetate (36.8%), 1,8-cineole (29.2%), linalyl acetate (5.2%), sabinene (3.9%) and linalool (3.1%)...
Conference Paper
Full-text available
The chemical composition of extract from the fruits of sweet fennel (Foeniculum officinale Mill.) by extraction with C 2 H 2 F 4 (1,1,1,2-tetrafluorethane) was analyzed using GC and GC/MS. The main compounds (concentration higher than 3 %) of extract were: anethole (68.3) and fenchone (17.7).The studied extract demonstrated antimicrobial activity a...
Article
The chemical composition of extract from the barks of cinnamon (Cinnamomum zeylanicum Nees) produced by extraction with 1,1,1,2-tetrafluoroethane was analyzed using GC and GC-MS. The main compounds (concentration higher than 3 %) of extract were: cinnamal (77.3 %) and coumarin (4.3 %). The studied extract demonstrated antimicrobial activity against...
Article
The aim of the present study was to establish the possibilities for improving the processed cheese quality by the addition of natural spice extracts. Four batches of processed cheese were produced by using of Piper nigrum L., Satureja hortensis L. and their natural extracts. Control and test samples were stored at 5±1°C for 10 days. Each batch of p...
Article
Full-text available
The chemical composition of extract from the flowers of violet and white lilac (Syringa vulgaris L.) by extraction with tetrafluoroethan was analyzed using GC and GC/MS. The main compounds (concentration higher than 3 %) of extract from violet lilac were lilac alcohol (13,57 %), 1,2,4-trimethoxy benzene (9,04 %), squalene (7,97 %), tricosane (7,34...
Conference Paper
Full-text available
Liquid aromatic products from tobacco representing Virginia flue-cured variety group (grown in Bulgaria, crop year 2008) have been obtained, through extraction with common and newly introduced solvents (96 % ethyl alcohol, petroleum ether, tetrafluoroethan). The chemical composition of tobacco essential oil and the respective aromatic products has...
Conference Paper
Full-text available
The chemical composition of extract from the flowers with bracts of linden (Tilia tomentosa Moench.) by extraction with tetrafluoroethan was analyzed using GC and GC/MS. 32 compounds (82,97 %) were identified and the main were phenylethylalcohol (24,74 %), phenylethyl benzoat (5,65 %), nonadecane (10,83 %), heneicosanе (9,06 %) and tricosane (8,04...
Conference Paper
Full-text available
Liquid aromatic products from tobacco representing Burley variety group (grown in Bulgaria, crop year 2008) have been obtained, through distillation and extraction with common and newly introduced solvents (96 % ethyl alcohol, petroleum ether, tetrafluoroethan). The chemical composition of tobacco essential oil and the respective aromatic products...
Article
Full-text available
The chemical composition of extract from the flowers of hyacinth (Hyacinthus orientalis L.) by extraction with tetrafluoroethane was analyzed using GC and GC/MS. 48 compounds (89,24 %) were identified and the main were benzyl benzoate (23,02 %), cinnamyl alcohol (12,78 %), benzyl acetate (6,36 %), p-cumic aldehyde (5,44 %), p-cymene (5,00 %) and α-...
Conference Paper
Full-text available
Extracts from anise friuts (Pimpinella anisum L.) by extraction with tetrafluoroethane(C2H2F4) at temperature 18 ОС and duration 75 и 120 min have been obtained. The chemical composition of essential and vegetable oils have been established by GC/МS. The major compound of the essential oils was trans-anethole (92,9 – 93,4 %), and of the vegetable o...
Article
Full-text available
C 2 H 2 F 4 - oleoresins of black pepper (dried fruits) and ginger (dried roots) from Vietnam were tested for their antimicrobial activities against some different strains of yeast, Gram-(+)-and Gram-(-)-bacteria by agar diffusion and agar dilution method, respectively. Both oleoresins showed a significant high antimicrobial activity against the Gr...

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