A Comprehensive Review of Design and Technological Advancements across Various Types of Solar Dryers

This analysis investigates the widespread use of solar drying methods and designs in developing countries,particularly for agricultural products like fruits,vegetables,and bee pollen.Traditional techniques like hot air oven drying and open sun drying have drawbacks,including nutrient loss and exposure to harmful particles.Solar and thermal drying are viewed as sustainable solutions because they rely on renewable resources.The article highlights the advantages of solar drying,including waste reduction,increased productivity,and improved pricing.It is also cost-effective and energy-efficient.The review study provides an overview of different solar drying systems and technologies used in poor nations,aiming to identify the most effective and efficient designs.The focus is on comparing current models of solar dryers for optimal performance.The review underscores the importance of solar drying as a long-term,eco-friendly approach to drying food in developing countries.This review aims to evaluate how using solar-powered drying techniques can enhance food preservation,minimize waste,and enhance the quality and marketability of agricultural goods.The paper will specifically focus on examining the efficacy of these methods for drying bee pollen and pinpointing where enhancements can be made in their advancement.

Antioxidant Effect of Plants Aqueous Extract on Lipid Stability of <i>Oreochromis niloticus</i>during Traditional Sun and Smoke Drying in Far-North Cameroon

Fishes are suitable for sun drying and smoking. But their high contains of unsaturated fatty acids make them very prone to lipid oxidation. However, some plants are rich in natural antioxidants and have been shown to be potent inhibitors of lipid oxidation during processing of meat. The effect of three aqueous plants extracts on lipid stability of Oreochromis niloticus collected in Far-North Cameroon during processing was evaluated. Results show the high nutritious of these fish with high levels of proteins, lipid and ash (71.02%, 13.71% and 10.65%, respectively). It has been observed that oleic acid (C18:1), followed by palmitic acid (C16:0) and linoleic acid (C18:2) are the most dominant fatty acids present in Oreochromis niloticus lipids. Their lipid also showed a much higher content of omega-3 polyunsaturated fatty acids (PUFA) compared to omega 6 PUFA. The total phenolic contents (TPC) of the three plants ranged from 12,150 to 16,050 mg/100 g. The leaves of Moringa oleifera exhibited the higher content of TPC. The results of iodine, peroxide value and thiobarbituric acids test were revealed that the aqueous extracts of the tree plants had antioxidant properties. These plants extracts inhibit lipid oxidation of Oreochromis niloticus during processing. Increasing of the concentration of plant extracts enhanced their antioxidant activities and the highest oxidation inhibitor was obtained at 30 g/l. Moringa oleifera leaves inhibit highly the lipid oxidation of Oreochromis niloticus.

External Heat Transfer in Moist Air and Superheated Steam for Softwood Drying

In kiln drying of softwood timber, external heat and moisture mass transfercoefficients are important in defining boundary temperature and moisture content at the woodsurface. In addition, superheated steam drying of wood is a promising technology but this has notbeen widely accepted commercially, partially due to the lack of understanding of the dryingphenomena occurred during drying. In this work, experimental investigation was performed to quantifythe heat transfer between wood surface and surrounding moist air or superheated steam. In theexperiment, saturated radiata pine sapwood samples were dried using dry-bulb/wet-bulb temperaturesof 60℃/50℃, 90℃/60℃, 120℃/70℃, 140℃/90℃, 160℃/90℃, 140℃/100℃ and 160℃/100℃. The lasttwo schedules were for superheated steam drying as the wet-bulb temperature was set at 100℃. Thecirculation velocity over the board surface was controlled at 4.2m·s^(-1). Two additional runs(90℃/60℃) using air velocities of 2.4 m·s^(-1) and 4.8 m·s^(-1) were performed to check theeffect of the circulation velocity. During drying, sample weight and temperatures at wood surfaceand different depths were continuously measured. Prom these measurements, changes in woodtemperature and moisture content were calculated and external heat-transfer coefficient wasdetermined for both the moist air and the superheated steam drying.

Effect of steam pretreatment on wood moisture content and characteristics of vacuum drying

The effects of high temperature steam pretreatment on the change in wood moisture content （MC） and characteristics of vacuum drying were investigated in this study. Poplar and manchurian walnut woods were pretreated with high temperature steam at 100~C and 140~C, prior to vacuum drying. A comparison of the characteristics of vacuum drying between steam pretreated wood and untreated wood was carried out. The results show that during steam pretreatment, the MC of wood decreased within a few hours. The reduction of MC varied with the temperature; the higher the temperature, the faster the MC dropped. During the vacuum drying stage, the rates of drying ofpretreated samples were higher than those of untreated samples when MC was below the fiber saturation point. Furthermore, the total drying time of samples treated at a steam temperature of 140~C was lower than that of untreated samples. Therefore, a vacuum procedure after steam pretreatment can effectively shorten the drying time when drying wood.

Spectrum-Toxicity Correlation Study Revealed the Influence of the Nine-Time Steaming and Sun Drying Method on Hepatotoxic Components of Polygoni Multiflori Radix

Objective:Polygoni Multiflori Radix(PM)is a traditional herbal medicine with repeated reports of liver injury events in recent years.We wondered whether the classical processing method,namely,nine-time steaming and sun drying(NSSD),had toxicity-attenuating effects on PM and the relationships between toxicity and times of processing,as well as with the alteration trends of its compounds.Materials and Methods:The chemical fingerprints of different PM extracts were developed using ultra-high-performance liquid chromatography.The spectrum-toxicity correlation between the chemical fingerprints and hepatocellular toxicity was analyzed with multiple correlation analysis.Results:The results suggested that the hepatotoxicity of NSSD processing products markedly decreased with the repeated steaming and sun drying,which was obviously superior to the product processed by the modern method.Comprehensive analysis revealed that the contents of cis-stilbene glycoside and emodin-8-O-β-D-glucoside related to liver injury susceptibility were reduced with the times of NSSD processing,which was consistent with the decreased trend of hepatocellular toxicity.After the five times of NSSD,the contents of them as well as the hepatotoxicity of PM were steady.Moreover,we found that the contents of catechin and physcion declined rapidly after the one time of NSSD and then remained stable until the nine times of NSSD.Based on the fact,they could be utilized to indicate whether PM products were processed by steaming and sun drying.Conclusions:This paper confirmed that the NSSD had a good influence on the toxicity attenuating to PM and found four compounds which could apply for the quality control of PM.

Evaluating Low Cost and Sustainable High Quality Cassava Drying Technologies among Small and Medium Processors in Uganda

Cassava regarded as a white gold of Africa is driving the agricultural commercialization and industrialization with small to medium technologies in Uganda. There is an over-whelming demand for high quality cassava flour （HQCF） by Bakeries, beverage industry, paper board and composite end markets. The end market for HQCF dictates on its quality attributes and rewards for its quality in terms of price offered within their minimum standards. However, obtaining sustainable amounts of HQCF for these markets calls for devoted efforts. Limited types of HQCF processing technologies exist and if they exist, their efficiency, costs and sustainability are not well understood. We evaluated high quality cassava drying technologies in Northern and Eastern Uganda in two years using naturally ventilated wooden screen solar drying structures and open air sun drying structures. Naturally ventilated wooden screen solar dryers produced clean dry high quality cassava chips free off insect and bird contamination and caused faster drying to less than 14.3% MC in 1.5 hours than open outside drying conditions. We recommend naturally ventilated wooden screen solar dryers for small and medium cassava processors during dry and rainy season. Halftone to one tone cassava chips dryers per day drying unit can cost one 2,258-4,338 USD to make it functional. Also open outside raised metallic racks with black surface can give good results on a good sunny day especially for starters on small scale basis. A small durable unit of 150 kilograms per day can be made with 500 USD.

正交试验优化当归趁鲜切片的加工工艺

目的通过药物成分含量检测与正交试验相结合的方式,确定当归趁鲜切片的工艺流程及工艺参数。方法先考察鲜当归杂质处理方法、切片的厚度及其干燥的方式对当归趁鲜切制外观性状、内在结构和药物成分(阿魏酸、挥发油)含量的影响。然后采用L_(9)(3^(4))正交试验,对当归饮片中阿魏酸含量进行分析,选出当归趁鲜切制的最适宜工艺条件。结果通过正交试验优化得到最适宜当归趁鲜饮片加工工艺为:首先将鲜当归除去芦头、须根和泥沙,并用水洗净其表面泥土和杂质,稍晾至没有水滴下滴时,放入温棚日晒干燥,直到当归归须和归尾(直径在5 mm以内)已干燥,归身变软,再将全当归切成4 mm薄片,最后放置在温棚日晒干燥,即得当归饮片,其饮片中阿魏酸含量为0.2211%,挥发油含量为0.9%;当归趁鲜切制最适宜工艺所得的当归饮片质量优于传统方法所得的质量(阿魏酸含量为0.1930%,挥发油含量为0.8%)。结论所得的加工工艺合理、可行,为后期当归趁鲜切片工艺研究奠定基础。

晒青绿茶加工过程香气物质及其部分前体变化分析

为探究晒青绿茶特征香气成分在加工过程中的变化规律,以云南大叶种为原料制作晒青绿茶,利用溶剂风味辅助蒸发萃取和气相色谱-质谱联用技术测定鲜叶、杀青叶、揉捻叶和晒青叶的挥发性物质,并结合气味活度值(odor activity value,OAV)表征晒青绿茶活性香气。结果显示,共检测出67种挥发性化合物,以醇类、酯类、醛类物质为主,从鲜叶至杀青结束后挥发物总量增加,晒青叶挥发物质总量较鲜叶略有下降,但种类数增加。晒青绿茶中OAV>1的活性香气成分共计23种,主要为芳樟醇、香叶醇、壬醛等呈花香型和青香型的化合物,各加工工序中以醛类最为突出。采用气相色谱-火焰离子化检测器和高效液相色谱-二极管阵列检测器分别测定其香气前体脂肪酸和类胡萝卜素组分含量,共检测出7种脂肪酸,以饱和脂肪酸为主。共检测出13种类胡萝卜素,其中黄体素在各加工工序中含量都为最高。在晒青绿茶加工过程中,脂肪酸和类胡萝卜素总量持续下降,亚油酸、亚麻酸尤为明显,与其主要降解产物己醛含量变化趋势相反;类胡萝卜素降解转化生成的萜烯酮、紫罗酮及其衍生氧化物,如β-紫罗酮、5,6-环氧-β-紫罗兰酮等含量显著上升。晒青绿茶加工过程中脂肪酸和类胡萝卜素前体变化趋势与其关联香气产物均有一定相关性。本研究结果可为定向改良晒青绿茶香气提供理论指导。

景迈山7个村寨古树茶的品质特征

【目的】初步探究景迈山古树茶的品质特征。【方法】选取景迈山7个主要村寨茶园,按照一芽两叶的标准采摘制作成晒青毛茶;采用顶空固相微萃取法—气相色谱—质谱法(HS-SPME-GC-MS)对茶样挥发性物质进行筛选和分类,采用常规方法测定理化成分,并结合感官审评对茶叶品质进行分析。【结果】共检测出45种香气物质,主要包括醇类、碳氢类、氧杂环类、芳香烃类、酮类、醛类等。筛选出16种具有香气特征的物质,可分为果香、木香(清香)和花香3种类型,除芒景下寨未检测出花香型外,其余村寨均含有上述3种香气特征物质,形成晒青茶的“花蜜香”。景迈山晒青茶平均含水量7.91%,水浸出物含量52.35%,游离氨基酸含量2.67%,茶多酚含量26.75%,可溶性糖含量7.60%,咖啡碱含量49.62 mg/g,没食子酸含量1.62 mg/g,黄酮含量6.50%,总儿茶素含量197.87 mg/g。【结论】景迈山古树茶理化成分含量均存在一定差异,可根据特有香气成分以及理化成分判别茶样来源。研究结果为景迈山古树茶品质预测模型的建立以及品质研究奠定了基础。

气相色谱-三重四极杆质谱法同时测定乌梅中25种多环芳烃及其污染来源分析

目的建立气相色谱-三重四极杆质谱法(gas chromatography-triple quadrupole mass spectrometry,GC-MS/MS)同时测定乌梅中25种多环芳烃(polycyclic aromatic hydrocarbons,PAHs),并对污染来源进行分析。方法样品经二氯甲烷超声萃取,基质固相分散(matrix solid-phase dispersion,MSPD)净化,DB-EUPAH色谱柱分离,多反应监测(multiple reaction monitorin,MRM)采集,内标法定量。结果25种PAHs在1~500 ng/mL范围内线性良好(相关系数r 2>0.997),检出限(limits of detection,LODs)为0.05~0.40μg/kg,定量限(limits of quantitation,LOQs)为0.20~1.40μg/kg,在1、5和20μg/kg 3个浓度水平的加标回收率为63.3%~119.0%,相对标准偏差(relative standard deviations,RSDs)为2.2%~6.5%(n=6)。乌梅样品中除二苯并[a,h]芘(DBahP)外,其余24种PAHs均有检出,菲(Phe)、荧蒽(Flt)、芘(Pyr)的含量较高,蒸晒与熏制乌梅中PAHs的污染分布存在明显差异。结论本方法前处理操作简单、灵敏度高、方法稳定、抗干扰性强,可同时实现乌梅中25种PAHs的测定。

赤水晒醋的挥发性香气特征及氨基酸分析

食醋的香气和口味特征是其品质的重要组成部分。采用感官定量描述性分析评价赤水晒醋的风味轮廓;应用顶空固相微萃取结合气相色谱-质谱联用分析晒醋中的挥发性成分,通过气味活度值法确定重要香气组分;测定晒醋的氨基酸含量,依据“蛋白质评价必需氨基酸标准模式”进行营养评价,通过滋味活度值法进行呈味评价。结果表明,晒醋酸香突出,花果香明显;口味以酸味和鲜味为主。检出挥发性香气成分56种,其中重要的香气成分14种,主要为二甲基三硫、2-甲基丁醛、2-甲基丙醛。检出氨基酸17种,必需氨基酸含量高,晒醋营养价值高;有呈味贡献的氨基酸有11种,谷氨酸和丙氨酸的滋味贡献度较大。

Tuning combined steam and dry reforming of methane for “metgas”production: A thermodynamic approach and state-of-the-art catalysts

Nowadays,combined steam and dry reforming of methane(CSDRM)is viewed as a new alternative for the production of high-quality syngas(termed as"metgas",H2:CO of 2.0)suitable for subsequent synthesis of methanol,considered as a promising renewable energy vector to substitute fossil fuel resources.Adequate operation conditions(molar feed composition,temperature and pressure)are required for the sole production of"metgas"while achieving high CH4,CO2 and H2O conversion levels.In this work,thermodynamic equilibrium analysis of CSDRM has been performed using Gibbs free energy minimization where;(i)the effect of temperature(range:200-1000℃),(ii)feed composition(stoichiometric ratio as compared to a feed under excess steam or excess carbon dioxide),(iii)pressure(range:1-20 bar)and,(iv)the presence of a gaseous diluent on coke yields,reactivity levels and selectivity towards"metgas"were investigated.Running CSDRM at a temperature of at least 800℃,a pressure of 1 bar and under a feed composition where CO2-H2O/CH4 is around 1.0,are optimum conditions for the theoretical production of"metgas"while minimizing C(S)formation for longer experimental catalytic runs.A second part of this work presents a review of the recent progresses in the design of(principally)Ni-based catalysts along with some mechanistic and kinetic modeling aspects for the targeted CSDRM reaction.As compared to noble metals,their high availability,low cost and good intrinsic activity levels are main reasons for increasing research dedications in understanding deactivation potentials and providing amelioration strategies for further development.Deactivation causes and main orientations towards designing deactivationresistant supported Ni nanoparticles are clearly addressed and analyzed.Reported procedures based on salient catalytic features(i.e.,acidity/basicity character,redox properties,oxygen mobility,metal-support interaction)and recently employed innovative tactics(such as confinement within mesoporous systems,stabilization through core shell structures or on carbide surfaces)are highlighted and their impact on Ni0reactivity and stability are discussed.The final aspect of this review encloses the major directions and trends for improving synthesis/preparation designs of Ni-based catalysts for the sake of upgrading their usage into industrially oriented combined reforming operations.

Effect of drying methods on the discoloration of three major domestic softwood species in Korea

Japanese pine, Korean pine and larch are three major softwood species in Korea. Their colors are relatively light, thus easily discolored due to drying and UV irradiation. In this study, they were dried with five different drying methods, steam treated and exposed to weathering. Their colors were measured using a spectrophotometer and comparisons made both among species and drying methods. For Japanese and Korean pines, high temperature dried and steam-dried specimens showed distinct color differences compared with the controls. Steam treatment discolored the dried specimens of Japanese and Korean pines but did not discolor those of larch. After weathering for 144 days the specimens of Japanese pine showed slight color differences among drying methods.

Drying Characteristics of Wood under Vacuum-superheated Steam

This paper presents comparison and analysis of thermal-dynamic characteristics of air-drying and superheated steam drying under vacuum. The result reveals that for both convective heat transfer coefficient and resistance of mass transfer on the surface, superheated steam drying under vacuum is superior to air-drying under the same condition. With Masson pine as specimen, we found that the inversion temperature really exists through comparable experiments of air-drying and superheated steam drying under vacuum. When temperature is above inversion point of temperature, drying speed is faster than that of air-drying; however, if temperature is below the point, the result is opposite. The inversion temperature of experiment ranges from 80 to 85 ℃.

Study of the best decocting time of sun dried ginseng by using the hyperspectral imaging technology

In this research,a new method based on the hyperspectral imaging for searching the best decocting time of sun dried ginseng is reported.The spectral images at diferent decocting time of test sample have been taken by the st aring hyperspectral fAuorescence imaging systen and the solubility of active ingredients have been discussed by analyzing the changes on the spectral.curves.The spectr al range of the system is 400-720nm and the spectral resolution is 5nm.In the decocting process,the active ingredients of nonsoaked ginseng was dissolved in the tissue fluid at first,and reached equilibrium condition at last after the precipitation-dissolution reciprocating process of boiling.At last,the experiment al results show that the best decoction time of sun dried ginseng is about 60 min after boiling.

Simultaneous syngas production with different H_2/CO ratio in a multi-tubular methane steam and dry reformer by utilizing of CLC

For syngas production, the combustion of fossil fuels produces large amounts of CO2 as a greenhouse gas annually which intensifies global warming. In this study, chemical looping combustion （CLC） has been utilized for the elimination of CO2 emission to atmosphere during simultaneous syngas production with different H2/CO ratio in steam reforming of methane （SR） and dry reforming of methane （DR） in a CLC-SR-DR configuration. In CLC-SR-DR with 184 reformer tubes （similar to an industrial scale steam reformer in Zagros Petrochemical Company, Assaluyeh, Iran）, DR reaction occurs over Rh-based catalysts in 31 tubes. Also, SR reaction is happened over Ni-based catalysts in 153 tubes. CLC via employment of Mn-based oxygen carriers supplies heat for DR and SR reactions and produces CO2 and H2O as raw materials simultaneously. A steady state heterogeneous catalytic reaction model is applied to analyze the performance and applicability of the proposed CLC-SR-DR configuration. Simulation results show that combustion efficiency reached 1 at the outlet of fuel reactor （FR）. Therefore, pure CO2 and H2O can be recycled to DR and SR sides, respectively. Also, CH4 conversion reached 0.2803 and 0.7275 at the outlet of SR and DR sides, respectively. Simulation results indicate that, 3223 kmol.h-l syngas with a H2/CO ratio equal to 9.826 was produced in SR side of CLC-SR-DR. After that, 1844 kmol.h-1 syngas with a H2/CO ratio equal to 0.986 was achieved in DR side of CLC-SR-DR. Results illustrate that by increasing the number of DR tubes to 50 tubes and considering 184 fixed total tubes in CLC-SR-DR, CH4 conversions in SR and DR sides decreased 2.69% and 3.31%, respectively. However, this subject caused total syngas production in SR and DR sides （in all of 184 tubes） enhance to 5427 kmol-h-1. Finally, thermal and molar behaviors of the proposed configuration demonstrate that CLC-SR-DR is applicable for simultaneous syngas production with high and low Hx/CO ratios in an environmental friendly process.

Establishment and Growth of Potato Micro-Cuttings in Sand Trays

Two separate experiments were conducted to evaluate the success of the establishment and growth of micro-cuttings of potato (5 - 6 cm tall) in sand trays [38 cm (L) × 28 cm (W) × 7.5 cm (H) plastic trays] under controlled environment (22?C ± 2?C, 60 - 75 μmosm–1?s–1 light energy for 16 h daily). In the first experiment, micro-cuttings of potato cv. Diamant were planted at six populations (500, 600, 700, 800, 900 and 1000 cuttings per tray) in treated sand (sun dry, 1% formaldehyde, 0.2% Dithane M-45 and control). The mortality percentage of micro-cuttings was nil for sun dry sand while formaldehyde and dithane M-45 treated sand had 1% - 4% against 15% in the control with the highest population density. Mortality of micro-cuttings in formaldehyde and dithane M-45 treated sand trays were found not to be related to pathogenic organism rather toxic effect of these two chemicals. Micro-cuttings in Sun dry and control treatments showed better growth performance than these in chemically treated sand trays. In the second experiment, urea @ 1, 2 and 3 g per tray was applied as solid form after 15 days of planting the micro-cuttings and as liquid form @ 0.5, 1 and 2% solution sprayed in the micro-cuttings repeatedly after 15, 30, 45 and 60 days of planting. The micro-cuttings which received urea as solid state died within 2 - 3 days and 2% urea solution was also detrimental. Urea solution @ 0.5% found to be very effective for vegetative growth of micro-cuttings in sand trays. The control was also good for vegetative growth but at a slower rate.

Simulation of Countercurrent Multi-Effect Drying System

The paper bulids a countercurrent multi-effect drying process model which can be expressed as a linear programming(LP) problem with the minimum total energy consumption as target function. Based on the model it can be conventient to solve the heat load , degree of drying and other drying parameters of each effect. And it realizes the mathematical simulation an analysis of multi-effect drying process. Such process not only reuses the secondary steam but also utilizes the high energy grade. Drying silica sand using 1-effect drying to 5-effect drying is presented as an example. The energy consumption and energy saving rate are compared by using co-current multi-effect drying and countercurrent multi-effect drying. As a summary, the countercurrent multi-effect drying is better than co-current drying. Considered the equipment investment and energy conservation, the study also concluded that the countercurrent 4-effect drying is the optimum selection, and it can save 57.6% energy compared to countercurrent 1-effect drying.

A Comparative Study of Antioxidant Activities between Fresh and Dry Mushrooms in the Genera <i>Cantharellus</i>and <i>Afrocantharellus</i>from Tanzania

Cantharellus and Afrocantharellus mushrooms are widely consumed in both fresh and dry forms. However, their antioxidant and whether their values changing with drying processes are not known. This study establishes their values and the effect of sun drying on their quality and quantity. Methanolic extracts of five Cantharellus and two Afrocantharellus species were investigated. The investigation used (1,1-diphenyl-2-picrylhydrazyl radical) DPPH as a substrate to determine radical scavenging abilities. Further quantitative analyses for carotenoids, flavonoid, total phenolic compounds and vitamin C content were done using spectrophotometric assay at 515 nm. Comparatively, fresh mushroom had higher vitamin C and Lycopene contents than their dry counterparts with β-carotene. Flavonoid and phenolic compounds were higher in dry forms than those in their fresh counterparts. Radical scavenging ability also varied with fresh forms depicting higher activity compared to dry forms. The variation was low in Afrocantharellus species (0.8% and 0.99%) while it was higher in Cantharellus species (24.12% and 7.52%). The highest ability was observed in fresh forms of Cantharellus pseudocibarius (EC50 50 = 0.4 mg/ml) was from dry form of Cantharellus rufopunctatus. This shows that studied mushrooms are rich in antioxidants and their quality and quantities are affected differently in both forms. Both dry and fresh mushrooms are potential sources of natural antioxidants. The portrayed high scavenging ability by these mushrooms envisages promoting them into potential nutraceutics.

不同海拔云南大叶种晒青茶感官品质及主要生化成分差异分析

为探究海拔对云南大叶种晒青茶品质的影响,以无量山不同海拔云南大叶种晒青茶为研究对象,采用感官审评、高效液相色谱法、同时蒸馏萃取/气相色谱-质谱法结合主成分分析、正交偏最小二乘法等技术和方法,对其感官品质、主要生化指标、挥发性成分进行比较分析。结果表明,海拔1400~1800 m的晒青茶(H1)茶汤色泽更浅,亮度更高;海拔1800~2000 m的晒青茶(H2)涩味减轻,鲜爽味增强;H1与H2主要生化成分和挥发性成分存在显著差异,H1水浸出物、茶多酚、儿茶素总量、没食子酸、酚氨比、没食子儿茶素没食子酸酯(GCG)、表儿茶素没食子酸酯(ECG)含量显著高于H2,游离氨基酸总量、茶氨酸、天冬氨酸、谷氨酸、甘氨酸、赖氨酸、异亮氨酸、苯丙氨酸含量显著低于H2;另外,H1与H2共有17种挥发性成分存在显著差异,分别为正癸酸、叶绿醇、壬醛、青叶醛、水芹醛、己酸乙酯、脱氢芳樟醇、邻苯二甲酸二异丁酯、1-己醇、反式橙花叔醇、法尼基丙酮、大马士酮、香叶醇、4-甲基-3戊烯-2-酮、亚麻酸甲酯、邻苯二甲酸二正丁酯、橙花醇。本研究结果可为海拔影响茶叶品质的研究提供理论依据。