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Register a new userEfficiency of pre-cooling system on some quality properties of “Al-Helwani” table grape cultivar during cold storage
كفاءة تصميم نظام تبريد أولي في تغير بعض صفات الجودة لثمار صنف عنب المائدة الحلواني خلال التخزين المبرد
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Damascus University ورقة بحثية
Publication date
2014
fields
Groves
and research's language is
العربية
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Shamra Editor
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تمت الدراسة على ثمار العنب الأوروبي .L vinifera Vitis صنف الحلـواني، لـشجيرات كرمـة مزروعة في محافظة السويداء في طور الإثمار المليء. حيث قطفت الثمار في موعدين مختلفين لـثلاث معاملات هي: التبريد الأولي، تأخير التبريد الأولي لمدة 12 سا، التخزين دون تبريد أولي. صممت حجرة 3 تبريد أولي أبعادها (1×1×1) م، بحمل تبريدي 125كغ/م، و تعتمد على التبريد بالمـاء المـثلج و تيـار الهواء المدفوع. و وضعت فيها صناديق العنب المعدة للتبريد الأولي. ثم نقلـت الثمـار مباشـرة لحجـر о التبريد، عند درجة حرارة 0 ±1 س و رطوبة نسبية 90 -95 .% و خزنت لمدة شهرين تم خلالهما أخـذ قراءة عينة البداية و القراءات الشهرية لكل من: نسبة الفقد بالوزن %، نسبة الفقـد المطلـق %، دليـل 2 النضج و درجة الصلابة كغ/سم و نسبة المواد الصلبة الذائبة الكلية %.
This study was conducted on European grape Vitis Vinifera L. Var. Helwani, for grape vine in full bearing. Fruit were picked, during two harvest dates and for three treatments (pre-cooling directly- pre-cooling after 12 h and without pre-cooling). A 1×1×1 m pre-cooling chamber was designed (cooling efficiency 125 kg\ m3) based on iced water and pumped stream air. In addition to that, we used boxes. Then handled fruit were transferred to the storage units at 0±1Cо and 90-95% RH for two months. The initial and monthly measurements for weight loss%, decay%, ripening indicator, firmness kg/cm2 and total soluble solids TSS % were done. The study showed significant effect of directly application of pre-cooling treatment on decreasing weight loss 0.508% and decay 0.591%.
References used
A merine M. A. and G. A. Root .1960. Carbohydrate content of various parts of the grape cluster. II. American Journal of Enology and Viticulture. 11(3): 137–139
Bachmann, J. and R. Earles. 2000. Postharvest Handling of Fruits and Vegetables. ATTRA Horticulture Technical Note. National sustainable Agricultural information service: 19. http// www.attar.ncat. Org/attarpib/ pdf /postharvestpdf
Beattie B. B. and A. P. Dahlenberg. 1989. Grapes. In: Beattie, B. B., McGlasson, W.B. and Wade, N.L. (eds) Postharvest Diseases of orticultural Produce, Vol. l. Temperate Fruit. CSIRO Publications, East Melbourne, Victoria, Australia: 67-73
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Grape Vitis Vinifera L. var. "Baladi" was fumigated with acetic acid at two
concentrations 75 and 100 %, during two successive seasons 2008/2009, to study
their effect comparing of sulfur dioxide pads and control. However, Sulfur
dioxide pads were
packed in 40 μm polyethylene bags thickness at two
concentrations 1 and 1.5 g/ kg fruit. All treatments were stored at 0 ± 1 Cº and
90-95% RH for three months, in cooling units of pome and vine research
department in Swaida. Chemical and physical properties were assessed every
15 days intervals, and in every time shelf life was measured for three days at
room temperature and calculated as total loss %. Acetic acid treatment effected
as well as or better than sulfur dioxide pads during cold storage. Which, acetic
acid fumigation decreased weight loss %, decay % and berry shatter %,
moreover, berry adherence strength (g) and berry firmness (kg/cm2) were
increased, but T.S.S %, total acidity % and sugars % have not significant
differences comparing to sulfur dioxide fumigation and control. In addition to
that, the application of acetic acid increased shelf life in days by decreasing
total loss %; also this treatment improved some sensory properties and was
satisfied for consumer demand.
The aim of present research was to study chemical, microbial and sensory
changes of commercial eggs during refrigerated storage and after treatment
with two different chlorinated water concentrations (100 ppm and 200 ppm)
and two different tempera
tures (20ºC and 40ºC) for 1 minute. Microbial
analysis showed that all eggs samples were free of Pseudomonas, Salmonella,
E.coli bacteria, molds and yeasts. The best treatment was (100 ppm at 20 °C),
followed by treatment with 100 ppm at 40 ° C and the third one was control
sample.
This study was conducted at the laboratories of Food Science Department at
the Faculty of Agriculture, Damascus University in order to study the
possibility of prolonging the shelf life of chicken breast by vacuum packaging
and treating with aceti
c acid. Chicken breasts were immersed into a solution
having 1% or 2% of acetic acid concentration for 30 sec. and packaged with
vacuumed and not vacuumed sacs. Samples were preserved at 4±1 ºC for 21
days and examined after 0, 7, 14 and 21 days of refrigeration for
microbiological, chemical and sensory properties. Microbiological analyses
included determination of total count of bacteria, coliforms, Salmonella,
anaerobic bacteria, Pseudomonas, yeasts and molds. Chemical analyses
included determination of pH value and non-protein nitrogen. Sensory
properties were evaluated for color, smell and texture. Results revealed that
samples immersed into a solution with 1% and 2% of acetic acid concentration
had affectively improved quality and sensory properties of chicken breast for
more than 14 days compared with control samples and the samples treated by
2% of acetic acid with vacuum packaging had the best quality results.
نفذ البحث خلال الفترة 2013-2016 م في كلية الزراعة بجامعة دمشق , بهدف دراسة تأثير المعاملة ببعض المواد الكيميائية والطبيعية ( 1- ميثيل سكلو بروبان , ونتروبروسيد الصوديوم , الشيتوزان , وأمينوفينل علايسين , والميثيل جاسمونات , وفيتامين E ) في القدرة الت
خزينية لثمار البندورة ( الهجين Tala ) وصفاتها البيوكيميائية ( نسبة المواد الصلبة الذائبة TSS ونسبة الحموضة القاتلة للمعايرة TA ) والفيزيائية ( الصلابة ونسبة الفقد بالوزن والفقد المطلق ومؤشرات اللون ) ومعايير الأكسدة ومضادات الأكسدة .
This research carried out to estimate the importance of use of 1-MCP in increasing
shelf life of Japanese persimmon ,var (Hachiya) , and maintaining fruits quality. The fruits
were treated with different concentrations of 1-MCP (0.5-1-1.5) ppm soon
ly after harvest
at 20Cᵒ during 24 h, then stored for 6 months at controlled conditions (2Cᵒ and 85% of
relative humidity). The samples were taken periodically (every month) to study the
changes in fruits composition during storage period.
The results showed that treatment with 1-MCP keeps fruits at higher degree of
firmness compared to the control, and decreased the loss in weight at storage period.The
treatment with 1-MCP decreased as well the changes in the fruits composition of Vitamine
c, total acidity (TA) compared to the control.
These results indicate that treatment with 1-MCP is effective in increasing shelf-life
of Japanese persimmon fruits var (Hachiya).
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